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Therapy General ePoster ViewingSunday - 7/25/2021
Therapy General ePoster Viewing AAPM ePoster Library

PO-GePV-T-1 : A Nomogram to Estimate Required Ci-S in Prostate HDR Brachytherapy
J. Nasehi Tehrani*, G. Lasio, B. Libby, N. Lamichhane, K. Jiang, M. MacFarlane, M. Guerrero

PO-GePV-T-2 : Independent Determination of Absorbed Dose to Water Depth-Dose Curves for Ru-106 Ophthalmic Plaques Traceable to the Primary Standards of External Beam Radiotherapy
V. Kaveckyte*, S. Dahlander, Å. Carlsson Tedgren

PO-GePV-T-3 : HDR Ring Applicator Commissioning: Eliminating the Need for Film-Processors to Generate Autoradiographs
J. Kilian-Meneghin*, S. Thompson, J. Khan, B. Liu, N. Yue, L. Hathout, I. Vergalasova

PO-GePV-T-4 : Quantifying Risk Associated with Physics Errors in HDR Prostate Brachytherapy Using Automated Simulations
M. Trager, J. Beaudry, D. Aramburu Núñez, G. Cohen, L. Dauer, D. Gorovets, N. Hassan Rezaeian, M. Kollmeier, B. Leong, P. McCann, M. Williamson, M. Zelefsky, A. Damato*

PO-GePV-T-5 : Error Detection in HDR Prostate Brachytherapy with Plan-Specific Optimization of In-Vivo Dosimetry (IVD) Parameters
D. Aramburu Núñez, M. Collier, J. Beaudry, G. Cohen, A. Damato*

PO-GePV-T-6 : Performance Evaluation of a Novel Quality Assurance Device for High Dose-Rate Brachytherapy
L. Sensoy*, N. Bassiri, P. De Jean, S. Benedict

PO-GePV-T-7 : Commissioning of Lumen Markers for Needle Visualization on MRI Scans in HDR-Gyn Brachytherapy
V. Chaswal*, R. Tolakanahalli, J. Contreras

PO-GePV-T-8 : Determination of Changes in Dosimetric Parameters with Co-60 and Ir-192 Source in High Dose Rate Brachytherapy of Cervical Carcinoma
S. Srivastava*, N. Moirangthem, N. Singh

PO-GePV-T-10 : Dose Optimization of Vaginal Cylinder: A New Planning Method for Patients with Endometrial Adenocarcinoma
X. Wu*, A. Mcdonald, S. Shen, S. Marcrom, R. Kim

PO-GePV-T-12 : Dosimetrc Evaluation of Rectal Hydrogel Spacer in Prostate HDR Treatments
I. Veltchev*, T. Lin, X. Chen, C. Lee, T. Dougherty, J. Wong, M. Hallman, E. Horwitz, R. Price, C. Ma

PO-GePV-T-13 : Commissioning of High Dose Rate Brachytherapy Surface Applicator System
B. Wichman*, D. Francom, T. Howard, A. Wilkinson, R. Posey

PO-GePV-T-14 : A Retrospective Dose Analysis of High-Dose Rate (HDR) Tandem and Ovoid and Interstitial Needle Cervical Brachytherapy Cases with a Model-Based Dose Calculation Algorithm (MBDCA)
B. Radcliffe*, S. Meltsner, Z. Chang, J. Chino, M. Huang, O. Craciunescu

PO-GePV-T-15 : HDR Brachytherapy as An Alternative to SBRT for Treating Selective Lung Cancer Patients
K. Lyons*, T. Biswas, C. Towe, N. Azar, M. Yao, C. Langmack, T. Podder

PO-GePV-T-17 : Evaluation of Post-Implant Dosimetry in LDR Permanent Interstitial Brachytherapy for Prostate Cancer
Y. Khouj*, T. Harris, D. O'Farrell, E. Neubauer Sugar, P. Nguyen, P. Orio, M. King, I. Buzurovic

PO-GePV-T-18 : Dosimetric Differences of Line-Source Versus Point-Source Approximation for Prostate Seed Implant
K. Lyons*, E. Fredman, G. Guo, R. Ove, T. Podder

PO-GePV-T-19 : MRI-Based Virtual Volume Study for Permanent Prostate Brachytherapy (PPB)
Y. Le*, S. Ng, Y. Yue, G. Guo, J. Holmes

PO-GePV-T-20 : Evaluation of Dosimetric Parameters of Two Brachytherapy Ophthalmic Sources Using Monte Carlo Simulation
P. Ramon*, A. Quevedo, T. Pianoschi

PO-GePV-T-21 : A Comparison of Surgical Bed Biologically Effective Dose From Permanently Implanted Collagen Tile Embedded Cs-131 Brachytherapy Vs Stereotactic Radiosurgery in Patients with Resected Brain Tumors
A. Turner*, M. Choi, D. Brachman

PO-GePV-T-22 : A Comprehensive Dosimetric Evaluation of Circular Collaborative Ocular Melanoma Study (COMS) Plaques and Eye Physics Plaques On a Standard Eye Model
E. Quan*, B. Teh, A. Schefler, R. Pino

PO-GePV-T-23 : Dosimetric Impact of Atlas Generated Contours for Post-Prostate Seed Implant Evaluation
A. Antolak*, J. Ciezki, M. Kolar

PO-GePV-T-25 : Evaluation of Dose Distribution From An Ophthalmic Brachytherapy Through the TOPAS Code
I. Knoll*, L. de Souza, A. Quevedo, M. Alva

PO-GePV-T-26 : Evaluation of MIM Symphony Treatment Planning System for Post Prostate Seed Implant (PPSI) Planning
H. Zhao*, F. Su, X. Li, J. Kunz, G. Nelson, P. Rassiah-Szegedi, K. Hopfensperger, G. Stinnett, Y. Huang

PO-GePV-T-27 : Automating Brachytherapy Treatment Plan Document Generation by Using Eclipse Scripting API (v15.6)
R. Sheu*, N. Vassell, C. Teng, Y. Lo

PO-GePV-T-28 : Evaluation of Eclipse Smart Segmentation for Liver Yttrium-90 Selective Internal Radiation Therapy
J. Li*, R. Anne

PO-GePV-T-29 : Validation of ACE: Advanced Collapsed Cone Engine Heterogeneity-Corrected Brachytherapy Dose Calculation with Gafchromic EBT3 Film
D. McIlrath*, E. Schnell

PO-GePV-T-30 : Investigation of Impact of Systematic Errors in Applicator Reconstruction On Doses of Organs at Risk and Target Volumes in Intracavitary Brachytherapy
G. Singh*, A. Mourya, B. SINGH, D. Thaper, R. Kamal, A. Oinam, V. Kumar, B. Rai

PO-GePV-T-31 : Focal-Boost Dose Escalation in High-Dose-Rate Brachytherapy
C. Guthier*, T. Harris, M. King, I. Buzurovic, R. Cormack

PO-GePV-T-32 : Recommendations for Previous Treatment Assessment of Non-CT Based IVRT Brachytherapy
D. Aramburu Núñez, V. Brennan, M. Kollmeier, K. Alektiar, A. Damato*, G. Cohen

PO-GePV-T-33 : Role of Planning Ring Structure in Volume Optimization for High-Dose-Rate Prostate Brachytherapy
Z. Shen*, O. Ragab, W. Yang, S. Balik, A. Zhuang, J. Cui, A. Shiu, E. Chang

PO-GePV-T-34 : Interfractional Dosimetric Variations of the Target and OARs for HDR GYN Brachytherapy
B. Washington*, M. Randall, D. Fabian, W. Luo

PO-GePV-T-35 : Calculation of Stopping-Power Ratios for Electron Beams Used in Total Skin Electron Therapy
G. Ding*

PO-GePV-T-36 : Variability of Bremsstrahlung Among Modern Detectors in Total Skin Electron Treatment
S. Kucuker Dogan*, M. Gopalakrishnan, I. Das

PO-GePV-T-37 : Verification of Electron Beam Energy Stability
J. Foy*, S. Kucuker Dogan, M. Gopalakrishnan, I. Das

PO-GePV-T-38 : An Investigation of Dosimetric Effects From Handlebars During Total Skin Electron Therapy
N. Brovold*, E. Dziemianowicz, K. Verdecchia

PO-GePV-T-39 : Real-Time in Vivo Dosimetry for Electron Beam Therapy Using Amorphous Silicon Based Flexible Thin Film Combined with Scintillating Powder
S. Jeong*, Y. Kwon, S. Park, D. Shin, Y. Lim, J. Jeong, H. Kim, W. Cheon, S. Lee

PO-GePV-T-40 : Evaluating a Commercial Electron Monte Carlo Algorithm Using Oblique Incidence and Irregular Surfaces Present On Custom Wax Phantoms
E. Cichewicz*, E. Salari, E. Parsai

PO-GePV-T-41 : Development of a Software Tool for FLASH Dose and Dose Rate Optimization for IntraOp Mobetron
A. Ayan*, D. Blakaj, A. Chakravarti, N. Gupta, J. Woollard

PO-GePV-T-42 : EFLASH Dosimetry On a Conventional Linac Using Pulse-Gated Delivery
C. Duzenli*, C. Mendez, M. Petric, J. Sweeney, D. Ta, T. Karan

PO-GePV-T-43 : Analog FLASH Pulse Integration Using An External Diode Circuit
J. Vadas*, R. Halford, G. Wilson, D. Yan, M. Snyder

PO-GePV-T-44 : Bremsstrahlung Dose of the Electron Beam at Extended Distances Used in Total Skin Electron Therapy
G. Ding*, S. Kucuker Dogan, I. Das

PO-GePV-T-45 : Creation and Validation of An Interactive Electron Cutout Library in a Clinical Environment
M. Keohane*, K. Crotteau, A. Riegel

PO-GePV-T-46 : A Thorough Validation of Electron Monte-Carlo Dose Calculation Algorithm and Generation of Correction Factors for Independent Monitor Units Hand Calculations in Clinic
A. Skinner*, S. Souri, J. Baker, E. Sudentas, G. Gill

PO-GePV-T-47 : A Monte Carlo Study of Patient Dose Distributions Between Stanford Six-Field and Rotational Techniques in Total Skin Electron Therapy
G. Ding*, Z. Chen, W. Zhong, T. Zhu

PO-GePV-T-48 : A Clinical Workflow for Creating 3D Printed Bolus with Isocenter and Orientation Labels for Placement
L. KUO*, S. Hellman, M. Trager, C. Huang, M. Aristophanous, C. Barker, G. Li

PO-GePV-T-49 : Quality Assurance and Acceptance of Eyeshields for Use in Electron Radiotherapy
H. Kadji*, B. Lewis, R. Teboh Forbang

PO-GePV-T-51 : Development and Validation of ESAPI Script Based Electron Cutout Digitizer
T. Chen*, H. Wang, J. Teruel, D. Barbee

PO-GePV-T-53 : A Comparative Study
of Different Collimation Methods for Quantification of Required Skin Margin During
electron Treatment

N. Shrestha*, M. Brenner, G. Narayanasamy, S. Morrill, H. Su, G. Lewis, F. Kalantari

PO-GePV-T-54 : Dosimetric Effects of a Commercial Breast Board Patient Support System
D. Pearson, E. Schodowski*, A. Wilkinson

PO-GePV-T-55 : Initial Characterization and Validation of a Commercial Head and Neck Immobilization System for MR-Guided Radiotherapy
J. McCulloch*, A. Gutierrez, T. Romaguera, D. Alvarez, K. Mittauer

PO-GePV-T-56 : Accuracy and Precision of Surface Tracking On Bra-Fitted Breast Radiation Treatment
T. Lin*, C. Ma

PO-GePV-T-57 : Clinical Implementation of An Abdominal Compression Belt On a Double Scattering Proton Machine
X. Wang*, Y. Zhang, J. Zhu, K. Qing, K. Nie, T. Cui, N. Yue, B. Liu

PO-GePV-T-58 : Comparison of Three Cushion Types for Gamma Knife Icon Mask Treatment
D. Luo*, T. Briere, E. Han, M. McAleer

PO-GePV-T-59 : Risk Mitigation Strategies for Custom Software in the Clinic
R. Cardan*, E. Covington, R. Popple

PO-GePV-T-61 : Recommendations for a Medical Physics Pre-Simulation Breath Hold Consultation: Medical Physics 3.0 in Practice
E. Cichewicz*, C. Windsor, J. Seekamp, D. Pearson

PO-GePV-T-63 : Skin Toxicity Assessment Using Optical-Wavelength Video Processing
R. Culcasi*, M. Snyder

PO-GePV-T-64 : Impact On Patient Reported Quality of Life From Reducing Prostate Margins in Patients Who Underwent Radiotherapy: A Prospective Clinical Trial
A. Kumarasiri*, S. Brown, E. Mohamed, I. Chetty, B. Movsas

PO-GePV-T-65 : NTCP Modeling of Patient Reported Dysphagia Using the EAT10 Scoring System 12 Months After Radiotherapy for Oropharyngeal Cancer
B. Chera*, A. Tzikas, E. Lavdas, R. Amdur, W. Mendenhall, N. Sheets, R. Green, L. Marks, S. Das, P. Mavroidis

PO-GePV-T-66 : Investigating the Time and Organ Dependency of NTCP Modeling of Patient Reported Sticky Saliva After HPV Associated Oropharyngeal Cancer
B. Chera*, A. Tzikas, E. Lavdas, R. Amdur, W. Mendenhall, N. Sheets, R. Green, L. Marks, S. Das, P. Mavroidis

PO-GePV-T-67 : NTCP Modeling and Dose-Volume Correlations of Significant Blood Count Drops 3 Months After Prostate Radiation Therapy
P. Papanikolaou*, G. Swanson, S. Stathakis, P. Mavroidis

PO-GePV-T-68 : A Framework for Exploring the Correlation Between Radiation-Induced Toxicities and Dosimetric Quantities
A. Abdel-Rehim*, H. Wan Chan Tseung

PO-GePV-T-69 : 4D Treatment Planning for Lung Proton Therapy: Treatment Design and Evaluation
V. Taasti*, D. Hattu, F. Vaassen, R. Canters, M. Velders, J. Mannens, J. Van Loon, I. Rinaldi, M. Unipan, W. Van Elmpt

PO-GePV-T-70 : Dose Enhancement Effects of High-Z Nanoparticles in Proton Therapy
K. Duke*, S. Ahmad, A. Lau

PO-GePV-T-71 : Radiobiological Evaluation of Physical Metrics in IMPT and VMAT Planning for Prostate Cancer Patient with Metal Hip Prostheses
W. Hsi*, T. Lee

PO-GePV-T-72 : Developing a Workflow Using Supercomputer Accelerated Monte Carlo Simulation Based On Machine Log-Files for Patient Specific Quality Assurance of the Mevion S250i Proton Therapy System
B. Chiang*, Y. Chen, S. Ahmad

PO-GePV-T-73 : Analysis of the Difference in Calculation of Physical Dose for Each Patient Site of SECT and DECT Using TOPAS
E. Yoon*, S. Jung, J. Son, B. Kim, C. Choi, J. Kim, J. Park

PO-GePV-T-75 : Development of a Machine Learning Model to Predict Dosimetric Impact of Proton Spot Delivery Errors
M. Newpower*, S. Ahmad, Y. Chen

PO-GePV-T-76 : Open Source TPS for Bragg Peak Proton FLASH Treatment Plans
L. Hotoiu*, A. Pin, S. Deffet, E. Sterpin, R. Labarbe

PO-GePV-T-77 : Virtual Particle Monte Carlo (VPMC), a New Concept to Avoid Simulating Secondary Particles in Proton Therapy Dose Calculation
J. Shan*, M. Fatyga, W. Liu

PO-GePV-T-78 : Experimental Validation of Clinical Proton Dose Calculation Algorithms for Breast Prostheses and Tissue Expanders
C. Chen*, P. Tsai, S. Huang, I. Choi, H. Lin

PO-GePV-T-79 : Development of a Fast and Memory-Efficient Monte Carlo Code for Proton Dose Calculation
H. Lee*, J. Shin, J. Verburg, H. Paganetti

PO-GePV-T-80 : Three-Dimensional Dose and LETd Prediction in Proton Therapy Using Artificial Neural Networks
F. Pirlepesov*, V. Moskvin, L. Wilson, A. Breuer, T. Merchant, A. Faught

PO-GePV-T-82 : Determination of Plan Deliverability and Treatment Time Estimation for Proton Pencil Beam Therapy Using a Machine Emulator Script
S. Mossahebi*, E. Makdsay Hana, J. Williams, B. Algawwam, A. Meijers, B. Yi

PO-GePV-T-83 : Characterizing the Entrance Dose Induced by a Dynamic Collimation System for Pencil Beam Scanning Proton Therapy Using a Commercial Multilayer Ionization Chamber
N. Nelson*, W. Culberson, B. Smith, R. Flynn, D. Hyer, P. Hill

PO-GePV-T-84 : Log File-Based Patient Specific Quality Assurance: 5 Years of Experience in Pencil Beam Scanning Pediatric Proton Therapy
O. Ates*, F. Pirlepesov, C. Hua, T. Merchant, L. Zhao

PO-GePV-T-85 : Feasibility of Delivering Exchanged PBS Treatment Plans in Two Gantries of Multiroom Proton Therapy System
C. Fang, Y. Huang, Y. Tao, L. Cao, G. Zhang, B. Qu, Z. Wang, Y. Zhang, S. Xu*

PO-GePV-T-86 : Quantitative & Statistical Analyses of Monthly OBI QA On Varian ProBeams
Z. Diamond*, A. Stanforth, R. Slopsema, K. Langen

PO-GePV-T-87 : Radiation Therapy Interference with Cardiovascular Implantable Electronic Devices; Comparison of Proton Beam Therapy Versus Intensity-Modulated Radiation Therapy
A. Anvari*, T. Alfonzetti, A. Butala, M. Carpenter, A. Kassaee, I. Paydar, J. Jones, D. Mihailidis

PO-GePV-T-88 : Output Estimation by Analytical and Machine Learning Models in a Double Scattering Proton System
J. Zhu*, T. Cui, Y. Zhang, Y. Zhang, C. Ma, B. Liu, K. Nie, N. Yue, X. Wang

PO-GePV-T-89 : Clinical Evaluation of Optically Stimulated Luminescence Dosimeters Dose Accuracy in Intensity Modulated Proton Therapy
J. Yu*, A. Wroe, A. Gutierrez

PO-GePV-T-90 : Influence of Beam Quality Correction Factors On Measurement Depth in Scanning Proton Beams Using Monte Carlo Calculation
M. Ichihara*, K. Yasui, C. Omachi, T. Toshito, J. Nagata, R. Oshika, S. Kurata, N. Hayashi

PO-GePV-T-91 : Adaptation of A
commercial Daily QA Device for Daily Spot Positioning QA

J. Kraus*, R. Cardan, K. McConnell

PO-GePV-T-92 : Evaluation of the PRESAGE Dosimeters for Spot- Scanning Proton Therapy
A. Xu*, H. Lin, C. Chen, Y. Wang, J. Adamovics, C. Wuu

PO-GePV-T-93 : Can An Ionization-Chamber Array Be Used for QA of Proton SBRT Beams?
A. Stanforth*, Z. Diamond, P. Sabouri, M. Zhu, J. Zhou, R. Slopsema

PO-GePV-T-94 : Novel Collimator for High-Throughput Proton FLASH-RT Murine Hemithorax Irradiations
S. Mossahebi, Y. Poirier*, A. Gerry, C. Repetto, Z. Vujaskovic, I. Jackson, A. Sawant

PO-GePV-T-97 : Optimizing Design And
commissioning of a Synchrotron Proton Beamline for FLASH Preclinical

U. Titt*, M. Yang, X. Wang, S. Lin, X. Zhu, K. Iga, N. Sahoo, A. Koong, X. Zhang, R. Mohan

PO-GePV-T-98 : Achievable Flash Dose-Rate by Cyclotron Based Proton Therapy Systems
S. Mossahebi, A. Sawant, J. Polf, E. Bentefour*

PO-GePV-T-99 : The Software Controller of Isocentric Rotation Chair Positioner for Treating Patients with Head/Neck Cancers in Fixed Carbon-Ion Beamline
W. Hsi*, X. Zhang, F. Yang, R. Zhou

PO-GePV-T-103 : Dosimetric Comparison of Intensity Modulated Radiation Therapy (IMRT), 3D Conformal Proton Therapy and Intensity Modulated Proton Therapy (IMPT) for Metastatic Brain Cancer
M. Sullivan*, S. Ahmad, H. Jin

PO-GePV-T-104 : Dosimetric Comparison of Volumetric Modulated Arc Therapy (VMAT), 3D Conformal Proton Therapy and Intensity Modulated Proton Therapy (IMPT) for Lung Cancer
M. Sullivan*, S. Ahmad, H. Jin

PO-GePV-T-105 : Dose-Averaged LET Evaluation in Head and Neck Adenoid Cystic Carcinoma Patients for Carbon-Ion Radiotherapy
R. Kohno*, S. Lee, A. Yamamoto, K. Yamaoka, M. Suga, M. Koto

PO-GePV-T-106 : Dose to Cardiac Implantable Electronic Devices in Patients Receiving Proton Beam Therapy
T. Alfonzetti, A. Anvari, A. Butala, M. Carpenter, A. Kassaee, I. Paydar, J. Jones, D. Mihailidis,

PO-GePV-T-107 : Dosimetric Comparison for Unfavorable Early Stage Lung Cancer: Intensity Modulated Proton Therapy Versus Volumetric Arc Photon Therapy
S. O'Reilly*, P. Singh, B. Hartl, E. Diffenderfer, K. Cengel, W. Levin, A. Berman, S. Feigenberg

PO-GePV-T-108 : Effective Treatment Plan Integrity Verification for Passive Scattering and Pencil Beam Scanning Proton Therapy
Y. Zhang*, M. Ho, C. Liu, X. Liang, P. Johnson, J. Park, M. Artz

PO-GePV-T-109 : Dosimetric Comparison of Pencil Beam Scanning Proton Plans with Different Aperture Modes
Y. Yuan*, D. Deblois, Y. Chen, C. Frame, D. Pang

PO-GePV-T-110 : Systematic Study of Penumbra Reduction with Adaptive Aperture for Hyperscan Spot Scanning Proton Beams
Y. Chen*, C. Frame, Y. Yuan, T. Ma, D. Pang

PO-GePV-T-111 : Reducing Beam Delivery Time for Proton PBS Treatment with Breath-Hold Motion Management Technique
M. Zhu*, A. Stanforth, Z. Diamond, Y. Lin, K. Langen

PO-GePV-T-113 : Monte Carlo Modeling of a Proton Portal Imaging System Using in Vivo Generated Neutrons
S. Thompson*, S. Samant, J. Nimmagadda, L. Maloney, E. Kryck

PO-GePV-T-114 : Initial Experience with a Head and Neck RapidPlan Model for Pencil Beam Scanning Proton Therapy
K. McConnell*, J. Snider, J. Nemec, R. Cardan

PO-GePV-T-115 : Should We Be Considering Biological Robustness in Proton Therapy?
A. Faught*, L. Wilson, M. Gargone, F. Pirlepesov, V. Moskvin, C. Hua

PO-GePV-T-116 : Assessment of A Knowledge-Based Planning for Robustly-Optimized Intensity Modulated Proton Therapy for Head and Neck Cancer
Y. Xu*, M. De Ornelas, J. Cyriac, E. Bossart, K. Padgett, M. Butkus, T. Diwanji, M. Samuels, N. Dogan

PO-GePV-T-117 : Knowledge-Based Planning for Robustly-Optimized Intensity Modulated Proton Therapy of Prostate Cancer
Y. Xu*, N. Brovold, E. Bossart, K. Padgett, M. Butkus, T. Diwanji, A. King, A. Dal Pra, M. Abramowitz, A. Pollack, N. Dogan

PO-GePV-T-118 : Assess the Interplay Effect Based On the Cyclotron Accelerator Proton Therapy System Machine-Specific Delivery Sequence Model
L. Zhao*, G. Liu, J. Shen, A. Lee, D. Yan, R. Deraniyagala, C. Stevens, W. Zheng, X. Li, S. Tang, X. Ding

PO-GePV-T-119 : Determination of Virtual Source Points for Mevion S250i Pencil Beam Scanning Proton System
Y. Chen*, C. Frame, T. Ma, Y. Yuan, D. Pang

PO-GePV-T-120 : Effects of the Activated Dental Metal Induced by Proton Beam Irradiation for Head and Neck Cancer: A Phantom Study
R. Kato*, T. Kato, T. Sagara, Y. Narita, K. Takayama, M. Murakami

PO-GePV-T-121 : Tuning, Calibration and Testing of a Dynamic Collimation System Controller for Pencil Beam Scanning Proton Therapy
K. Patwardhan*, T. Geoghegan, B. Smith, R. Flynn, D. Hyer

PO-GePV-T-122 : Dosimetric Investigation of Inverse-Optimized Proton GRID and Lattice Treatment Plans with a Clinical Pencil Beam Scanning System
M. Zhu*, H. Chen, J. Snider, W. Regine, J. Bradley, M. McDonald, P. Patel, P. Sabouri, K. Langen

PO-GePV-T-123 : Evaluation of Distorted Lateral Beam Profiles in MRI-Guided Proton Therapy
H. Ueda*, Y. Fujii, K. Umegaki, T. Matsuura

PO-GePV-T-125 : Monte Carlo Evaluation of Neutron Dose Equivalent Topatients Treated with Vertex Beams in IMPT and PSPT
U. Titt*, D. Grosshans, N. Sahoo, X. Zhu, R. Mohan

PO-GePV-T-126 : Novel Dynamic Apertures for Reducing Spot Sizes in Proton Therapy
J. Holmes*, S. Patel, W. Wong, R. Foote, W. Liu

PO-GePV-T-127 : Considerations in Lung SABR IMPT Using Two Different PBS Systems
H. Su*, W. Hsi, E. Brooks

PO-GePV-T-128 : Dynamically Collimated Spatially Fractionated (GRID) Pencil Beam Scanning Proton Therapy
B. Smith*, B. Allen, D. Hyer

PO-GePV-T-129 : Impact of Noise Level On the Analysis of Proton Exposed Targets
F. Saheli*, N. Vosoughi, Z. Riazi, H. Shahabinejad, F. Rasouli

PO-GePV-T-130 : A Preliminary Study of DECT- and Kernel-Based Dose Calculation Algorithm for Carbon Beam Therapy
W. Shin*, E. Yoon, B. Kim, S. Jung, J. Son, J. Park, J. Kim, C. Choi

PO-GePV-T-131 : Assessment of Metal Artifact Reduction in Dual-Layer Dual-Energy Computed Tomography for Carbon Ion Radiotherapy
S. Jung*, B. Kim, E. Yoon, J. Park, J. Kim, J. Son, C. Choi

PO-GePV-T-132 : Preliminary Investigation of the Dosimetric Impact of Common Dental Restorative Materials On Proton Beams
A. Gomez*, M. Leyva, L. Coutinho, E. Rosen, N. Kalman, M. Hobson

PO-GePV-T-133 : Wireless Device for Adaptive Planning Based Upon Thermoacoustic Range Estimates - Design and Benchtop Validation
S. Patch*, M. Narayanaswamy

PO-GePV-T-134 : Sensitivity of Target Coverage and Patient Specific IMPT QA to Spot Positioning Errors
S. Mossahebi*, P. Sabouri, B. Zhang, E. Makdsay Hana, J. Williams, S. Chen

PO-GePV-T-135 : Impact of Spot Position Uncertainties On Intensity Modulated Proton Therapy Plans for Head and Neck Cancers
P. Sabouri*, S. Mossahebi, B. Zhang, S. Chen

PO-GePV-T-136 : Impact of Esophageal and Biliary Stents On Proton Dose Calculation
S. Mossahebi*, P. Sabouri, G. Kim, J. Polf, J. Molitoris, B. Greenwald, P. Darwin, S. Chen

PO-GePV-T-137 : Non-Radioactive Elements for Prompt-Gamma Production Enhancement in Proton Therapy
P. Galanakou*, T. Leventouri, W. Muhammad

PO-GePV-T-138 : The Benefit of Novel Beam Arrangements Made Feasible by Range Uncertainty Reductions in Proton Therapy for Brain and Skull Base Tumors
S. Tattenberg*, T. Madden, B. Gorissen, T. Bortfeld, K. Parodi, J. Verburg

PO-GePV-T-139 : Incident Learning During the Early COVID-19 Pandemic
B. Chera*, K. Kujundzic, A. Raldow, J. Olsen, H. Demoss, S. Weintraub, B. Salter, S. Evans

PO-GePV-T-140 : Radiotherapy Prescription Quality
R. Larouche*, N. Lahaie, A. Veillette, T. Vu, S. Michalowski

PO-GePV-T-141 : Retrospective Review and Analysis of Treatment Planning Errors
M. Joo*, M. Lin, A. Godley, D. Sher, E. Chambers, C. Wallace, A. Pompos

PO-GePV-T-142 : Automated Plan Checking Software Demonstrates Continuous and Sustained Improvements in Safety and Quality: A 3-Year Longitudinal Analysis
S. Liu*, D. Stuhr, Y. Zhou, H. Pham, J. Xiong, J. Mechalakos, S. Berry

PO-GePV-T-144 : RAdiotherapy Dose Accumulation Routine (RADAR) - a Fast Dose Accumulation Tool for Planning with Previous Treatments
Y. Hu*, L. KUO, J. Mechalakos, L. Zhang, N. Shah, A. Ballangrud, A. Li, J. Deasy, L. Cervino, P. Zhang

PO-GePV-T-145 : Validation of Gamma Analysis Software
I. Mendez*, J. Rovira Escutia, B. Casar

PO-GePV-T-147 : Automated Verification of Treatment Parameter Transfer Between TPS and OIS Databases Via Direct Value Comparison
W. Donahue*, E. Draeger, D. Han, Z. Chen

PO-GePV-T-148 : Application of FMEA to Review and Analyze Software Error Messages
B. Miller*, S. Gardner, C. Smith, Z. Sun, N. Wen, I. Chetty

PO-GePV-T-149 : A Custom-Made Cassette for In-Water Film Dose Measurements and Quality Assurance of Cs-137 Blood Irradiators
H. Moktan Tamang*, S. Jayarathna, R. Tailor, S. Cho

PO-GePV-T-150 : Development of An In-House Off Axis Mechanical Isocentricity Test
J. Seekamp*, D. Pearson

PO-GePV-T-152 : Application of Automatic Plan Checking and Report Printing to Improve Clinical Workflow Accuracy and Efficiency
P. Yan*, D. Mynampati, S. Hsu, A. Basavatia, P. Brodin, C. Velten, W. Tomé

PO-GePV-T-153 : Towards Implementation of a Knowledge-Based Decision Support System for Treatment Plan Auditing Through Automation
S. Liu*, K. Ohri, J. Bertini, S. Berry, D. Yang, C. Della-Biancia

PO-GePV-T-154 : A Methodology and Open Source Tool for Radiotherapy Dose Transformation QA
H. Clark*

PO-GePV-T-155 : Challenges On Implementing An Hybrid AI-And-Rules Based Plan Check Tool in Clinical Practice - a Pilot Study
S. Luk*, E. Ford, M. Kim, M. Phillips, K. Hendrickson, A. Kalet

PO-GePV-T-156 : Development of An Automated Pre-Treatment Plan Evaluation
J. Rembish*, P. Myers, C. Kabat, N. Bice, K. Rasmussen, D. Saenz, N. Kirby, N. Papanikolaou, S. Stathakis

PO-GePV-T-157 : An End-To-End Test to Evaluate Off-Axis Targeting Accuracy for Single-Isocenter Multitarget Stereotactic Radiosurgery
C. Guthier*, S. Friesen

PO-GePV-T-158 : How AI Can Support Personalized Risk Mitigation During Automated Treatment Planning
M. Bach*, G. Spira

PO-GePV-T-159 : Failure Modes and Effects Analysis of Low Dose Bilateral Whole Lung Irradiation Treatment for COVID-19 Positive Patients Requiring Respiratory Ventilation
A. Swanson*, D. DiCostanzo, N. Gupta, K. Hintenlang, A. Cetnar

PO-GePV-T-160 : Failure Modes and Effects Analysis (FMEA) for Multi-Site, Multi-Institutional Deep Inspiration Breath Hold (DIBH) Treatments
M. Dimayorca*, S. Wadi-Ramahi, R. Lalonde, T. Wilhite, S. Ellsworth, A. Hays, M. Huq

PO-GePV-T-161 : Comparing Leakage Doses Between Three Gamma Knife Icon Machines
H. Wang, D. Luo*, R. Pino

PO-GePV-T-162 : Failure Mode and Effect Analysis for Volumetric Modulated Arc Therapy for Total Body Irradiation
T. Gray*, A. Antolak, S. Ahmed, A. Magnelli, L. Lu, Y. Cho, P. Xia, B. Guo

PO-GePV-T-163 : Efficiency Analysis of the Automatic Plan Printing Application
J. Park*, K. O'grady, L. KUO, W. Fong, W. Yan, R. Lalonde, L. Cervino

PO-GePV-T-164 : Sources of Systemic and Random Errors in Bleached Optically Stimulated Luminescence Dosimeter (OSLD) In-Vivo Measurements: A Retrospective Clinical Study
S. Yoon*, H. Lin, C. Kennedy, D. Mihailidis, B. Burgdorf, T. Li

PO-GePV-T-165 : The Use of Statistical Process Control Methods to Evaluate Patient-Specific Delivery QA Failure as a Function of Plan Complexity
R. Price*, I. Veltchev, T. Lin, A. Eldib, C. Ma

PO-GePV-T-166 : Variability of Control Limits for Mean Percent Dose Differences Across Different Anatomical Contours
H. Mehrens*, R. Douglas, M. Gronberg, K. Nealon, L. Zhang, L. Court

PO-GePV-T-167 : An Investigation of a Statistical Process Control Based Quality Assurance for Optical Stimulated
Luminescence Detector (OSLD) System

K. Episcopia, R. Febo, D. Lovelock, L. Cervino, S. Lim*

PO-GePV-T-168 : 4D Monte Carlo Assessment of the Impact of Inter- and Intra-Fractional Respiratory Motion Variation On Delivered Dose
M. Shiha*, J. Cygler, R. Macrae, E. Heath

PO-GePV-T-169 : Dosimetric Impact On VMAT Plan Delivery From Tumor Motion Variations Due to Breathing Irregularities
A. Sehovic*, P. Shukla, L. Xu, X. Nie, Y. Zhou, L. Zhang, P. Wang, A. Wu, A. Rimner, P. Zhang, G. Li

PO-GePV-T-170 : A Practical Workflow to Streamline Treatment Planning for Reirradiation with Considering Biological Doses
A. Tai*, E. Quashie, E. Gore, J. Bovi, X. Li

PO-GePV-T-171 : Daily Portal Exit Dosimetry Images as a Way to Monitor Interfractional Dosimetric Variation: A Feasibility Study
A. Haertter*, E. Hubley, S. Yoon, T. Li, W. Gu, C. Kennedy

PO-GePV-T-172 : Initial Experience with Varian Portal Dosimetry Patient-Specific QA
J. Wong*, S. Wisnoskie, W. Nie, Y. Lei, A. Besemer

PO-GePV-T-173 : Long-Term Monitoring of ASi-1200 EPID Performance
I. Kutuzov*, R. Rivest, E. Van Uytven, B. McCurdy

PO-GePV-T-174 : Machine Learning Based Prediction for Patient-Specific Quality Assurance: Understand the Plan Complexity for VMAT
X. Zhang*, Y. Zhang, B. Liu, N. Yue, K. Nie

PO-GePV-T-175 : Quantitative Comparison of 2D and 3D Modes of a Commercial EPID-Based Hybrid Patient-Specific QA System for Spine SBRT Treatments
S. Ahmed*, J. Zavala Bojorquez, P. Qi, S. Chao, E. Murphy, J. Suh, P. Xia

PO-GePV-T-176 : Comparison of Pixel Sensitivity Map Methods for EPID Dosimetry Measurement
M. Ahmed*, N. Dang, V. Leandro Alves, J. Siebers

PO-GePV-T-177 : A New Generation of X-Ray Irradiator for Preclinical Research: Dosimetric Characterization
M. Rezaee*, J. Wong

PO-GePV-T-178 : An Improved Statistical Model for Gamma Index Pass Rates in Intensity Modulated Radiation Therapy Patient-Specific Quality Assurance
P. Jensen*, W. Donahue, Z. Chen

PO-GePV-T-179 : EBT3 Film Calibration Using Deep Learning with Keras Functional API
L. Chang*

PO-GePV-T-180 : Longitudinal Shift Limitation for Long-Field Delta4 Measurements
L. Che Fru*, S. Frigo

PO-GePV-T-181 : Initial Experience in Comparing IQM and SRS MapCHECK for Single ISO Multiple Mets Brain SRS/SRT Plan Quality Assurance
Y. Liang*, D. Pavord, H. Lee, Z. Horne, R. Wegner, S. Karlovits, J. Sohn

PO-GePV-T-182 : Clinical Implementation of Varian TrueBeam Portal Dosimetry: Comparison to Sun Nuclear MapCHECK2 for Patient-Specific Quality Assurance
S. Roles*, B. Broekhoven, W. Godwin, A. Rapchak, C. Mart, D. McDonald, G. Owen, M. Maynard, J. Peng, K. Fallon

PO-GePV-T-183 : Extraction of a Large Dataset Populating the Gamma Criteria Parameter Space for EPID-Based Patient-Specific QA
P. Brown*, S. Tanny, D. Rosenzweig

PO-GePV-T-184 : Development of a User-Friendly Correction Method for the Lateral Response Artifact From Flatbed Scanners in Radiochromic Film Dosimetry
G. Guyer*, R. Kueng, A. Joosten, M. Fix, P. Manser, S. Mueller

PO-GePV-T-185 : Stereotactic Patient QA Evaluation Between MapCheck SRS 2D Array, Electronic Portal Image Dose (EPID) and EBT3 Gafchromic Film Dosimetry
P. Tsiamas*, W. Cruz, W. Fontenot, J. Limmer

PO-GePV-T-187 : Validation of Rapid Arc Gating Technique for Lung and Liver Stereotactic Body Radiation Therapy (SBRT) with In-House 4D-Phantom
C. Bhatt*, A. Kumar, R. Dobhal

PO-GePV-T-188 : A Convolutional
neural Network Model for Predicting Gamma Passing Rate of 3D Array Detector-Based VMAT QA

T. Matsuura*, D. Kawahara, A. Saito, E. Shiba, K. Yamada, S. Ozawa, Y. Nagata

PO-GePV-T-189 : Machine- and Site-Specific Analyses of TomoTherapy Patient-Specific QA Results Planned with Accuray Planning Station and RaySearch RayStation
P. Hill*, R. BAYLISS

PO-GePV-T-190 : Quasi-3D Dosimetry System with Solid Polyurethane-Based Dosimeter
J. Cho*, S. Jung, J. Son, H. Jin, C. Choi, J. Park, J. Kim

PO-GePV-T-191 : Utilization of a Plan Quality Prediction Software to Investigate Patient Specific QA Passing Rates
P. Irmen*, C. Stambaugh, C. Melhus

PO-GePV-T-192 : Design of a Respiratory Motion Quality Assurance System
with Portal Dosimetry and Customizable Tumor Phantom

H. Tan*, L. Tan, C. Koh, K. Ang, S. Park

PO-GePV-T-193 : Automatic Plan Quality Assurance Using Knowledge-Based DVH Prediction for Head and Neck Cancer Patients
W. Cao*, M. Gronberg, A. Olanrewaju, C. Cardenas, B. Beadle, L. Court

PO-GePV-T-194 : Estimation of Dosimetric Leaf Gap Correction Factor as Part of Commissioning a Log File Based QA System
S. Unnikrishnan*, S. Neelakandan Sukumari, P. Raghukumar

PO-GePV-T-195 : Sensitivity of OSLD with Fully Filled Deep Electron/hole Traps in Kilovoltage Energy Range
M. Chun*, H. Jin, S. Lee, O. Kwon, C. Choi, J. Park, J. Kim

PO-GePV-T-196 : Measuring Superficial Total Doses Delivered by Helical Tomotherapy
using EPR Dosimetry

S. Höfel*, M. Fix, M. Drescher, F. Zwicker

PO-GePV-T-197 : Evaluating the Accuracy of Different Methods for Estimating the Dose to An IMD (implanted Medical Device) of a TBI Patient, Treated at An Extended Distance with External Blocks
L. Russell*, J. Sillanpaa

PO-GePV-T-198 : Dosimetric Evaluation of Prostate VMAT Plans Optimized by the Photon and Progressive Resolution Optimization Algorithm
J. Chow*, R. Jiang, K. Mamaril

PO-GePV-T-201 : Automated and Clinical-Criteria-Driven Planning for Locally Advanced Non-Small-Cell Lung Cancer Using the Expedited Constrained Hierarchical Optimization (ECHO) System
Q. Huang, L. Hong, Y. Zhou*, G. Jhanwar, J. Yang, H. Pham, E. Yorke, L. Cervino, J. Deasy, M. Zarepisheh

PO-GePV-T-202 : Monitor Unit Efficient VMAT Treatment Planning Facilitated by the MU Objective Tool
M. Ashenafi*, M. Hare, C. Rothfuss, H. Zhang

PO-GePV-T-204 : Sparing Lung Tissue with Virtual Block Method in VMAT Planning for Locally Advanced Non-Small Cell Lung Cancer
J. Chen*, J. Dai

PO-GePV-T-206 : Using a Novel Leaf Sequencer and Segment Shape Optimization Algorithm to Reduce Treatment Session Times On the Elekta Unity
J. Snyder*, J. St-Aubin, S. Yaddanapudi, S. Strand, S. Kruger, R. Flynn, D. Hyer

PO-GePV-T-207 : Volumetric Dose Reconstruction for Iso-Dose Tuning
L. Ma*, M. Chen, X. Gu, W. Lu

PO-GePV-T-208 : A Multi-Staged Treatment Planning Framework for Large-Volume Ventricular Tachycardia Stereotactic Ablative Radiotherapy
X. Gu*, R. Timmerman, J. Daniels, R. Wu, W. Lu

PO-GePV-T-209 : An Evaluation of Complex Plan Quality Using RayStation’s Collapsed Cone Convolution (CCC) Algorithm as a Function of Differing Hardware Given a Time Constraint
E. DeLuca*, N. Sperling

PO-GePV-T-211 : Dosimetric Differences of Plans Using Flattened 6MV Versus Flattening-Filter-Free 10MV Beams for the Treatment of Prostate with and Without Seminal Vesicles
M. Ashenafi*, C. Rothfuss, A. Gray, H. Zhang

PO-GePV-T-212 : Evaluation of Elekta Unity IMRT Beam Complexity Using a Novel Leaf Sequencer and Shape Optimizer in the Monaco Treatment Planning System
J. St-Aubin*, J. Snyder, S. Yaddanapudi, R. Flynn, D. Hyer

PO-GePV-T-213 : Sub-Segmentation of Laryngopharynx Whole-Mean Dose Constraints for Reducing Intra-Organ Dose Variability
C. Sample*, H. Clark

PO-GePV-T-216 : Dosimetric Impact in GNP-Enhanced Radiotherapy Using the 10 MV FF and FFF Photon Beams: A Monte Carlo Depth Dose Study
J. Chow*

PO-GePV-T-217 : A Study of Surface Dosimetry for Whole Breast Irradiation Geometry Using EBT3 Gafchromic Film and Monte Carlo Simulation
S. Su*, E. Carpentier, C. Duzenli

PO-GePV-T-218 : Dosimetric Considerations of Modable Silicones for Radiotherapy Boluses and Phantoms
G. Aldosary*, J. Belec, C. Foottit, E. Vandervoort

PO-GePV-T-219 : Feasibility of 18-MV Grid Therapy From the View of Radiation Protection
A. Karimi, X. Wang*, S. Mirian, H. Vega-Carrillo, M. Mohiuddin

PO-GePV-T-220 : Impact of Depth-Induced Spectrum Change On the Dose Enhancement of Gold Nanoparticle Aided Radiotherapy at Megavoltage Energy
R. Schmidt*, J. Shi, J. Ford, D. Hara, N. Dogan, A. Pollack

PO-GePV-T-221 : Validation of the Monte Carlo Model of a Novel Biology-Guided Radiotherapy (BgRT) Linac
M. Shi*, K. Bush, C. Chuang, D. Zaks, L. Xing, N. Kovalchuk, M. Surucu, B. Han

PO-GePV-T-222 : Focal Spot Size Effect of the RefleXion X1 Radiotherapy Machine: A Monte Carlo Simulation Study
O. Oderinde*, D. Zaks, C. Huntzinger, S. Shirvani, T. Laurence, M. Lu

PO-GePV-T-223 : Evaluating Backscattered Radiation Into the Dose Monitor Chamber in the RefleXion X1 Using Monte Carlo Simulation
O. Oderinde*, D. Zaks, C. Huntzinger, S. Shirvani, A. Maniyedath, T. Laurence, M. Lu

PO-GePV-T-224 : On the Determination of Source Parameter Probability Distribution Functions During the Monte Carlo Modeling of a CyberKnife M6 Unit
J. Duchaine*, D. Markel, H. Bouchard

PO-GePV-T-225 : KQ Calculations of the ZAP-X Radiosurgical Device
R. Townson*, F. Tessier, G. Weidlich, D. Pang, M. McEwen

PO-GePV-T-226 : Characterization of Phosphorescent Strontium Aluminate as a Real-Time Dosimeter
S. Drehmel*, D. Mathew, E. Ehler

PO-GePV-T-228 : Evaluation of a Scripted Planning Technique in Lung SBRT
J. Donaghue*, S. Gajdos, L. Muhieddine Mossolly

PO-GePV-T-229 : Retrospective Study of a Novel Automated Software for the Evaluation of Hypofractionated Treatment Plans Using Conventional Constraints
D. Baldassari*, C. Esquivel, L. Patton, A. Tipton, T. Roberts

PO-GePV-T-231 : An Evaluation of An EQD2 Conversion Via Commercially-Available Software for Hypofractionated Treatment Plan Tolerances: A Retrospective Study
D. Baldassari*, L. Patton, T. Roberts, A. Tipton, C. Esquivel

PO-GePV-T-232 : Evaluation of Bladder Dosimetric Property for Localized Prostate Cancer Using Deformable Registration of Simulation CT
C. Ma*, X. Zhang, Y. Zhang, N. Yue, X. Wang

PO-GePV-T-233 : Dosimetric Comparison of VMAT Prostate Plans Designed with 10MV Vs 18MV Photon Beams
D. Shvydka, M. Hajduk*

PO-GePV-T-234 : Evaluation of Two Different Dose Calculations Algorithms Between Two Treatment Planning Systems
J. Martinez*, H. Soysal, C. Yang

PO-GePV-T-235 : Can a Seven-Day Subset of CBCTs Be Representative of All CBCTs When Reconstructing the Dose Delivered Over the Entire Course of Treatment for Prostate Bed Radiotherapy?
D. Soliman*, M. Noy, M. Karp, A. Dal Pra, E. Bossart

PO-GePV-T-237 : Overlapping Volume Histogram (OVH) as a Tool for OAR Delineation Outliers Detection and DVH Prediction
T. Teo*, M. Gopalakrishnan, D. Cutright, I. Das

PO-GePV-T-238 : To Assess the Impact of Bowel Gas Override On Pelvis Treatment Plans: Case Studies
V. Chaswal*, S. Davis, J. Contreras, R. Tolakanahalli

PO-GePV-T-239 : API Driven Plan Scorecard Designer for the Evaluation of External Beam Planning Quality
M. Schmidt*, M. Folkerts, C. Abraham, B. Baumann, N. Knutson, F. Reynoso, E. Pryser, E. Sajo, P. Zygmanski, M. Jandel, A. Magliari

PO-GePV-T-240 : The Use of Daily Transit Dosimetry to Monitor Anatomy Changes and Setup Errors in Prone Breast Radiotherapy
X. Shen*, S. Hsu, D. Mynampati, P. Brodin, A. Basavatia, J. Fox, W. Tomé

PO-GePV-T-242 : A Comparison of Modulated Planning Techniques for Whole Brain Hippocampal-Avoidance Radiotherapy
E. Viviers*, P. Johnson

PO-GePV-T-243 : Dosimetric Comparison of the New Pinnacle Evolution Versus Pinnacle Version 16.2
M. Naessig*, N. Kirby, B. Brown, C. Kalu, A. Woodin, J. Gonzales, N. Reyes Iii, P. Myers

PO-GePV-T-244 : Investigating the Differences Between PlanIQ and IPA Planning Tools for Plan Optimization in Head & Neck Cancers
C. Kabat*, S. Stathakis, H. Parenica, N. Papanikolaou, S. Das, B. Chera, P. Mavroidis

PO-GePV-T-245 : Preliminary Patient Specific Dose Constraints of Rectum for Prostate Cancer Treatment
J. Zhang*, B. Lee, W. Inouye, R. Kwon, W. Lien

PO-GePV-T-247 : Planning Strategies for Whole Head-And-Neck Radiation with Robustness Against Shoulder Motion Using Volumetric-Modulated Arc Therapy
J. Cammin*, T. Bouton, E. Chacko, B. Zhang, S. Chen, J. Molitoris, B. Yi

PO-GePV-T-248 : Dosimetric Study for Spine SRT Plans with Carbon Fiber Stabilization Devices
H. Lee*, J. Palmer, A. Ayan

PO-GePV-T-249 : The Feasibility Study of Using Light Detection and Ranging (LiDAR) Application for Total Body Irradiation (TBI)
B. Yeager*, F. Mostafaei, M. Gagne, J. Barrett, A. Al-Basheer

PO-GePV-T-251 : Conformal Radiotherapy with Sequential Boost Versus Intensity-Modulated Radiation Therapy with a Simultaneously Integrated Boost
G. Komisopoulos*, M. Tolia, A. Siountas, S. Stathakis, N. Papanikolaou, P. Mavroidis

PO-GePV-T-252 : Dosimetric Impact of Multi-Leaf Collimator Positional Errors On Standard-Fractionated and Hypofractionated Radiotherapy Using Flattened and Flattening Filter-Free Beams
H. Enomoto*, Y. Fujita

PO-GePV-T-253 : Treatment of Large-Size Prostate Cancer Patients On An O-Ring Linac with 6MV FFF: Plan Quality Comparison with a C-Arm Linac Using 10MV Or 15MV Photons
B. Liu*, C. Cheng, X. Wang, J. Zhu, R. Parikh, K. Nie, N. Yue, Y. Zhang

PO-GePV-T-254 : The Future Is Here: An Inter-Comparative Study of AI and Human-Generated Plans Using Dosimetric Indices as a Guide to Plan Efficacy
S. Pokharel*, A. Pacheco, S. Tanner

PO-GePV-T-255 : Are Auto-Generated Organ-At-Risk Contours Good Enough in Prostate Radiotherapy?
H. Liu*, B. Sintay, D. Wiant

PO-GePV-T-256 : Dosimetric Effects Due to Inter-Observer Variability of Organ Contouring When Utilizing a Knowledge-Based Planning System for Prostate Cancer
H. Liu*, C. Amaloo, B. Sintay, D. Wiant

PO-GePV-T-257 : A Single Institution Evaluation of a Machine Learning Based Decision Support Software for Head and Neck Radiotherapy
L. Zhuang*, E. Bowers, M. Pankuch, M. Posner

PO-GePV-T-258 : An Unsupervised Method for Error Detection of Treatment Plan in Radiotherapy
Z. Song*, H. Yan, J. Dai

PO-GePV-T-260 : Patient Treatment Transferability Between Unmatched Medical Linacs
J. Foy*, S. Kucuker Dogan, I. Das

PO-GePV-T-261 : Development of a Progressive Plan Quality Evaluation Solution
J. Neylon*, J. Hegde, S. Mccloskey, J. Lamb

PO-GePV-T-262 : A Retrospective Study to Establish Recommendations for Plan Quality Metrics in Linac Lung SBRT
S. Taghizadehghahremanloo, F. Akbari*, D. Pearson

PO-GePV-T-263 : Evaluation of Treatment Plan Uncertainties for VMAT TBI
I. Duarte*, P. Galavis, N. Gerber, D. Barbee, J. Teruel

PO-GePV-T-264 : Three-Year Experience with Active Breathing Coordinator Device Used in Reducing Radiation Dose to the Heart in Left-Sided Whole Breast Cancer Patients
R. Gupta*, M. Huq

PO-GePV-T-265 : Investigating the Level of Dose Trade-Offs Between Left Lung and Heart in Lung Cancer Cases to Identify Optimal Sparing
K. Pant*, G. Komisopoulos, J. Dooley, K. Wang, A. Weiner, S. Das, P. Mavroidis

PO-GePV-T-266 : Automated and Clinical-Criteria-Driven IMRT Planning for Prostate Using Expedited Constrained Hierarchical Optimization (ECHO)
Y. Zhou*, L. Hong, Q. Huang, G. Jhanwar, J. Yang, H. Pham, L. Happersett, A. Damato, L. Cervino, J. Deasy, M. Zarepisheh

PO-GePV-T-268 : Evaluation of Initial Planning Techniques in Ethos for Adaptive Head and Neck Patients
N. Nasser*, J. Caudell, E. Moros, V. Feygelman, G. Redler

PO-GePV-T-269 : Analyzing Performance of Atlas-Based and Deep Learning-Based Auto-Segmentation in Breast Cancer Patients
M. Weiland*, K. Kisling

PO-GePV-T-272 : Implementation of An Automated Workflow for Planning Tangential Breast Radiotherapy
T. Keiper*, D. Hoffman, K. Kisling

PO-GePV-T-273 : Adequacy of Target Volume Drawn Based On "slow" CT Scan for SBRT Lung Treatment in Helical TomoTherapy
S. Awan*, S. Burt, R. Badkul, A. Meigooni

PO-GePV-T-274 : Interpolation of Dose Planes for Use in the Optimization of Multi-Leaf Collimator Dosimetric Leaf Gap and Transmission
D. DiCostanzo*, A. Ayan

PO-GePV-T-275 : Accounting for Dose Accumulation Uncertainty in Spine Reirradiation
L. Zhang, N. Shah, Y. Hu, P. Zhang, A. Ballangrud, J. Deasy, L. Cervino, L. KUO*, J. Mechalakos

PO-GePV-T-276 : Determining the Optimal Assigned Density for Various High-Density Prostheses Calculated with AcurosXB and AAA
H. Genco*, S. de Boer

PO-GePV-T-277 : Implementing Recommendations of TG 329
E. Sudentas*, L. Fu, C. Teng

PO-GePV-T-278 : A Hybrid Full-Body Image Set Generation for TBI Using Both CT and 3D Optical Imaging
H. Jung*, S. Kim

PO-GePV-T-279 : PenMRT: A Multi-Scale Dose Calculation Engine for Microbeam Radiation Therapy
S. KESHMIRI*, S. Brocard, N. Rosuel, R. Serduc, J. Adam

PO-GePV-T-280 : Evaluation of Beam Data Correspondence for Five TrueBeam Linear Accelerators
S. Gardner*, C. Smith, B. Miller, N. Wen, I. Chetty

PO-GePV-T-281 : Solving Beam Orientation Optimization (BOO) of IMRT Treatment Plan Using Tree Embedded Reinforcement Learning for Prostate Cancer
A. Sadeghnejad Barkousaraie*, A. Balagopal, G. Bohara, S. Jiang, D. Nguyen

PO-GePV-T-282 : Clinical Impact of the Dose Calculation Engine for Vestibular Schwannoma Treatments On Cyberknife
E. Ali*, E. Vandervoort

PO-GePV-T-283 : Improved Dose Prediction Performance with Data Clustering and Transfer Learning On H&N Cancer Patients
D. Nguyen*, T. Bai, A. Sadeghnejad Barkousaraie, R. McBeth, A. Balagopal, S. Jiang

PO-GePV-T-284 : Feasibility Study of a Novel and Efficient Treatment Planning Technique for Total Body Irradiation and Total Marrow Irradiation On Conventional Linacs
C. Han*, S. Dandapani, J. Wong, A. Liu

PO-GePV-T-285 : Generalizability Study On a Deep Learning-Based Dose Conversion Model
X. Zhong*, Y. Xing, M. Lin, S. Jiang, Y. Zhang

PO-GePV-T-286 : Dosimetric Evaluation of Dose Accumulation in MIM and Pinnacle System
M. Liu*, I. Xhaferllari, J. Liang, D. Lack, M. Snyder

PO-GePV-T-287 : Knowledge-Based Planning Assisted Automatic Prostate Cancer Radiation Treatment Planning
L. Chen*, Z. Xiong, A. Godley, S. Jiang, M. Lin

PO-GePV-T-288 : Dose Evaluation of Deep Inspiration Breath-Hold On the Left Anterior Descending Coronary Artery for Left-Sided Breast Irradiation
A. Kwag*, J. Jung

PO-GePV-T-289 : Discrepancies in Out-Of-Field Dose Prediction Between Treatment Planning Systems
T. Tyson*, M. Mistro, A. Kubli, A. Harrison, K. Mooney

PO-GePV-T-290 : Investigation of the Dosimetric Effects of An SBRT Positioning System
D. Baldassari*, C. Esquivel, K. Andrews, L. Patton

PO-GePV-T-291 : The Impact of Treatment Planning System Errors On Patient Dose Delivery
F. Brooks*, M. Glenn, J. Pollard-Larkin, R. Howell, C. Peterson, C. Nelson, C. Clark, S. Kry

PO-GePV-T-292 : Dose Prediction Using Three-Dimensional Convolutional Neural Network for Nasopharyngeal Carcinoma with Tomotherapy
Y. Liu, G. Zhang, Z. Chen, J. Wang, X. Wang, B. Qu, S. Xu*

PO-GePV-T-293 : ROI Contour Based Deep Learning AAA Dose Improvement Method
Z. Wang*, Q. Zhou, Y. Liu, Z. Chen, B. Yang, J. Qiu

PO-GePV-T-294 : The Effect of Contrast Agents On Dose Calculations in Volumetric Radiotherapy for Critical Structures
S. Almohsen*, A. Elawadi, M. Alshanqity, H. Alassaf, R. ELGENDY, H. Allazkani, R. Mohamed

PO-GePV-T-295 : A Simple Method for Accurate Multi-Target Winston-Lutz Testing
G. Gilson*

PO-GePV-T-296 : Physics Quality Assurance: A Pilot Survey of Global Needs
A. Yorke*, E. Ford

PO-GePV-T-297 : Accelerator Beam Data Variability with Detectors
S. Kucuker Dogan*, M. Gopalakrishnan, I. Das

PO-GePV-T-299 : Toward Ending the Manual Annual: Lessons Learned From the Expansion of An Automated Output Quality Assurance Technique to Outside Institutions
L. LeMerise*, E. Morris, B. Loughery

PO-GePV-T-300 : An Innovative Water-Equivalent Solid Device for Beam Scanning to Replace Computerized 3D Water Scanning Systems
K. Xie*, D. Shvydka, N. Sperling, E. Parsai

PO-GePV-T-302 : API Assisted Treatment Planning System Validation for Medical Linear Accelerators
M. Schmidt*, N. Knutson, B. Sun, E. Sajo, P. Zygmanski, M. Jandel, G. Hugo, J. Kavanaugh, F. Reynoso

PO-GePV-T-303 : Independent Evaluation of MPC Using Winston-Lutz Test
W. Luo*, M. Halfman

PO-GePV-T-304 : Quantification of Peripheral Dose in the New Ring-Gantry RefleXion X1 Radiotherapy Machine
O. Oderinde*, S. Khan, M. Narayanan, A. Maniyedath, S. Shirvani, G. Kuduvalli

PO-GePV-T-307 : Validation of Non-Isocentric Delivery and Analysis of VMAT QA Plans Using ArcCHECK
G. Cui*, N. Walls, N. Eclov, J. Duan

PO-GePV-T-308 : On the Performance of LINAC Annual Quality Assurance Without the Need for a 3D Water Tank
H. Kadji*, B. Lewis, R. Teboh Forbang

PO-GePV-T-309 : Small Field Dosimetry of a Novel Biology-Guided Radiotherapy System
B. Han*, N. Kovalchuk, M. Shi, K. Bush, D. Capaldi, D. Breitkreutz, E. Simiele, L. Xing, M. Surucu, C. Chuang

PO-GePV-T-310 : A Novel Method to Verify Deformable Dose Accumulation for Patients Treated with Helical Tomotherapy
H. Zhong*, J. García Alvarez, K. Kainz, G. Chen, A. Tai, E. Ahunbay, X. Li

PO-GePV-T-313 : Second Dosimetry Check with Deep DoseNet
P. Dong*, L. Xing

PO-GePV-T-314 : Validation of ClearCalc Photon Secondary Check Dose Calculation Algorithm
J. Wong*, Y. Lei, S. Wisnoskie, A. Granatowicz, S. Wang, A. Besemer, M. Hyun, S. Zhou, C. Enke, Q. Fan

PO-GePV-T-315 : Comparison of Secondary MU Calculation Softwares for Clinical Use: RadCalc and ClearCalc
H. Lee*, A. Pompos, M. Lin

PO-GePV-T-316 : Modulation Area Index (MAI): A Plan-Specific Metric for Quantifying VMAT Modulation Complexity
B. Wu*, R. Gonzales, J. Qian, L. Lin, J. Yu, H. Li, S. Han-Oh

PO-GePV-T-317 : The Impact of Flattening Filter Free On Remaining Volume at Risk in Lung Cases for VMAT and IMRT Techniques
M. Alfishawy*

PO-GePV-T-318 : Field Junction Technique for Total Body Irradiation Using Tomotherapy with TomoDirect Mode
Y. Suetsugu*, N. Higashi, Y. Fukuyama, K. Inoue, K. Matsumoto, H. Terashima, T. Sasaki

PO-GePV-T-319 : Commissioning and Clinical Implementation of Pseudo 4Pi On An MR-Guided Radiotherapy (MRgRT) Linac
J. McCulloch*, A. Gutierrez, T. Romaguera, D. Alvarez, K. Mittauer

PO-GePV-T-320 : Dosimetric Analysis of ElastoGel Bolus
M. Pacella*, M. Webster, S. Tanny

PO-GePV-T-321 : Validation of Spatial Fractionated GRID Treatment Planning Using Volumetric Modulated Arc Therapy (VMAT)
C. Collins*, M. Schwer, M. Keefe, D. Wazer, G. Cardarelli

PO-GePV-T-322 : Treatment Planning and Verification for Radiodynamic Therapy Using 45 MV Beams
A. Eldib*, J. Liu, C. Ma

PO-GePV-T-323 : Dosimetric Impact of Materials Override of Hydrogel Spacer in Stereotactic Body Proton Therapy (SBPT) for Locally Advanced Pancreas Cancer (LAPC)
D. Han*, H. Hooshangnejad , W. Yao, J. Jatczak, K. Ding

PO-GePV-T-324 : Quantifying the Dosimetric
effect of Tumor Treating Fields (TTF) Transducer Arrays: Is a Correction Needed?

K. Kelly*, I. Alecu, N. Papanikolaou, N. Kirby, P. Myers, D. Saenz, S. Stathakis, K. Rasmussen

PO-GePV-T-326 : An Investigation Into the Dosimetric Properties of a Three-Dimensional (3D) Printing Material for Potential Use in Radiation Therapy
K. Bittinger*, N. Sperling

PO-GePV-T-327 : Volumetric Axillary Boost (VMAB): Novel Planning for Nodal Coverage in Breast/Chestwall Patients
W. Duggar*, B. Eske, D. Deng, H. Soysal, C. Yang

PO-GePV-T-328 : Development of a Collision Prediction Tool Between Gantry and Table Using Blender
G. Guyer*, Y. Wyss, J. Bertholet, P. Mackeprang, H. Loebner, M. Fix, P. Manser, M. Stampanoni, S. Mueller

PO-GePV-T-329 : Preliminary Treatment Planning System Commissioning Results for the First Clinical Biology-Guided Radiotherapy Machine
N. Kovalchuk*, B. Han, E. Simiele, D. Capaldi, D. Breitkreutz, T. Yeung, J. White, D. Zaks, M. Owens, S. Maganti, A. Purwar, L. Vitzthum, D. Chang, L. Xing, M. Surucu

PO-GePV-T-330 : Capacity Assessment of African Clinics to Conduct Hypofractionated Radiotherapy Clinical Trials for Localized Prostate Cancer
W. Swanson*, M. Lavelle, V. Ainsworth, N. Bih, D. Seymour, W. Ngwa

PO-GePV-T-331 : Photoelectric Dose-Enhancement Using FDA-Approved Materials
W. Swanson*, Y. Hao, W. Ngwa

PO-GePV-T-332 : Comparing Ideal and Realistic Surrogate Motions with the Radixact Synchrony System
K. Jeong*, L. Goddard, W. Tomé

PO-GePV-T-333 : End-To-End Testing of Hybrid VMAT-Based Total Body Irradiation Technique: Simulation, Planning and Delivery Verifications
S. Ahmed*, T. Gray, L. Lu, P. Xia, B. Guo

PO-GePV-T-334 : Pre-Treatment 4DCT Fiducial Marker Combination Selection for Robotic Lung SBRT
W. Belcher*, A. Ju, J. Jung

PO-GePV-T-335 : Prediction of Fiducial Marker Positions in Robotic SBRT Using 4D-CTs at Different Treatment Dates
J. Jung*, W. Belcher, K. Patel, E. Patel, K. Yang, S. Sharma, A. Ju

PO-GePV-T-336 : The 4D Composite Dose Study of the Breath Motion Effect During the Lung Stereotactic Body Radiotherapy (SBRT)
Z. Xia*, F. Wang, Y. Xu, J. Xu

PO-GePV-T-337 : Effect of Target Positioning Error On Tumor Control Probability in Stereotactic Radiosurgery for Metastatic Brain Tumors Using the CyberKnife M6
T. Takizawa*, S. Tanabe, H. Nakano, S. Utsunomiya, M. Sakai, K. Maruyama, S. Takeuchi, T. Nakano, A. Ohta, M. Kaidu, H. Ishikawa, K. Onda

PO-GePV-T-338 : Predicting the Effect of Indirect Cell Kill for Radiosurgery of Multiple Brain Metastases Via Single-Isocenter/Multi-Target Volumetric Modulated Arc Therapy (SIMT-VMAT)
A. Palmiero*, D. Fabian, M. Randall, W. St Clair, D. Pokhrel

PO-GePV-T-339 : Treating Vestibular Schwannomas Abutting the Brainstem with SRS/fSRS Alone
M. Keohane*, Z. Whiting, D. Koffler, A. Goenka, E. Calugaru, J. Chang

PO-GePV-T-340 : Evaluation of Three Dosimeters On Output Factor Measurement of the New Aktina SRS Cone System
L. Zhuang*, M. Gao, M. Pankuch, M. Xu, G. Pixton, C. Breit

PO-GePV-T-341 : A Multi-Clinic Validation of An End-To-End Procedure for MLC-Based Stereotactic Radiosurgery with a Novel Phantom
T. Brown*, J. Fagerstrom, C. Beck, C. Holloway, J. Kerns, D. Kaurin, K. Kielar

PO-GePV-T-342 : Consistency in Response Between Two Copies of a High-Resolution Diode Array for SRS Dosimetry
B. Barraclough*, J. Hansen

PO-GePV-T-343 : Evaluation of a New Diode Detector for Beam Data Measurements
S. Stathakis*, C. Kabat, M. Naessig

PO-GePV-T-344 : A Comparison of Field Output Corrections Factors for a Diode Detector Among Various Measurement Setups and Among Various Energies for Stereotactic Cones
Y. Lee*, Y. Kim

PO-GePV-T-347 : Dosimetrical Verification of Output of Small Cones in a Radiosurgery Device
L. Jin*, S. Hayes, C. Ma

PO-GePV-T-349 : Thresholding Gamma Analysis On SRS Anthropomorphic Phantoms
A. Molineu*, L. Acuna Scafati, S. Kry

PO-GePV-T-350 : An End-To-End, Low-Cost, Universal Winston-Lutz Type Quality Assurance Procedure for Hypofractionated Image-Guided Stereotactic Radiosurgery
L. Ma*, W. Hu, T. Nano, L. Wang, C. Chuang

PO-GePV-T-351 : Evaluation of Delivery Quality Assurance of Cyberknife Stereotactic Radiosurgery
J. Li*, X. Zhang, H. Zhuang, R. Yang

PO-GePV-T-352 : Comparison of SRS QA Tools On IROC Head Phantom Plan
C. Teng*, N. Vassell, E. Sudentas, T. Nguyen, Y. Lo

PO-GePV-T-353 : Implementing a QA Phantom to Test Discrepancies in Stereotactic Space Definition for Gamma Knife ICON
J. Caron*, S. Ahmad, Y. Chen

PO-GePV-T-354 : Evaluation of a New Winston Lutz Tool for the Treatment of Multiple Brain Metastases for Mono-Isocentric Beams
A. Perez-Andujar*, Y. Mutaf, G. Klein, J. Chen

PO-GePV-T-355 : Simple and Reliable Calibration Fields for OrthoChromic Film Dosimetry Protocol
W. Feng*, C. Shi, J. Zhou, A. Chu, L. Zhou, J. Sakellakis, M. Needham, A. Grann

PO-GePV-T-356 : The Effect of Collimator Setting On Small Photon Field Output in a Commercial Treatment Planning System
S. Zhang*, D. Du, C. Han, A. Liu

PO-GePV-T-357 : Comparison of Commercial Pre-Treatment QA Devices for Stereotactic Radiotherapy Plans
S. James*, A. Al-Basheer, E. Elder, J. Barrett, F. Mostafaei

PO-GePV-T-360 : Clinical Evaluation of a Novel Automatic Inverse Planning System in Gamma Knife Lightning
T. Cui*, K. Nie, J. Zhu, D. Shabbar, J. Weiner, A. Chundury, N. Ohri, Y. Zhang, I. Vergalasova, N. Yue, X. Wang

PO-GePV-T-361 : Dose Gradient Improvement for SBRT Lung Plans During Optimization
T. Li*, B. Mowbray, P. Vadnais, A. Mendez, C. Geraghty, B. Hasson

PO-GePV-T-362 : Investigation of Treatment Planning Strategies for Multi-Isocenter Intracranial
stereotactic Radiosurgery

I. Rusu*, J. Roeske, S. Gros, A. Solanki, H. Kang

PO-GePV-T-363 : Validation and Clinical Implementation of VMAT Liver SBRT On 6MV-FFF O-Ring Halcyon Linac
T. Tackett*, A. Webster, M. Bernard, M. Kudrimoti, D. Pokhrel

PO-GePV-T-365 : Evaluation of Model-Based Dose Algorithms Using HU as a Density Surrogate for FFF-SBRT of Island Lung Lesions
B. Bismack*, S. Devpura, I. Chetty

PO-GePV-T-366 : Evaluation of Parameters Affecting Gamma Passing Rate in Patient-Specific QA’s for Multiple Brain Lesions IMRS Treatments
E. Salari*, D. Shvydka, E. Parsai

PO-GePV-T-368 : To Determine the Impact of Rotational Uncertainties On Dosimetric Coverage of Distant Targets Using VMAT Planning and a TPS Tool to Measure Plan Uncertainty
G. Klein*, Y. Mutaf

PO-GePV-T-369 : Feasibility of Skull Base Stereotactic Radiotherapy On Elekta MR-Linac
H. Wang*, J. Yang, J. Phan, E. Han, T. Lim, P. Castillo, X. Wang

PO-GePV-T-370 : Impact of MLC Uncertainty in Single Isocenter Multiple-Lesions SRS VMAT Plans
J. Xu*, E. Chacko, B. Zhang, M. MacFarlane, K. Jiang, M. Mishra, M. Guerrero, S. Chen

PO-GePV-T-371 : Use Monte-Carlo Simulation to Determine the Coverage-Based PTV Margin
L. Huang*, J. Chang

PO-GePV-T-373 : Dosimetric Impact of Anatomical Changes Between Photon and Proton Stereotactic Body Radiation Therapy for Lung Cancer
C. Liu*, T. Ma, T. Gray, S. Ahmed, N. Yu, K. Stephans, G. Videtic, P. Xia

PO-GePV-T-374 : The Dosimetric Effect of Using a Titanium Material Assignment Versus Limited Hounsfield Units for SBRT Spine Patients with Hardware
Z. Richards*, D. Christ, D. DiCostanzo, K. Dibs, D. Blakaj

PO-GePV-T-375 : Quantitative Assessment of Inter-Fractional Anatomy Change On Dose Delivery of Prostate SBRT
C. Cheng*, X. Zhang, B. Liu, N. Yue, R. Parikh, Y. Zhang, X. Wang

PO-GePV-T-376 : Analysis of Plan Quality for Intensity-Modulated Proton Therapy Vs. Photon Stereotactic Radiosurgery for Brain Metastases
T. Gray, C. Liu, P. Xia,

PO-GePV-T-377 : Robustness of AI Treatment Planning to Account for Inter-Fractional Changes in Targets and OARs
T. Gray*, W. Wang, C. Liu, Q. Wu, D. LaHurd, E. Balagamwala, A. Vassil, P. Xia

PO-GePV-T-379 : Dosimetric Comparison of ZAP-X and CyberKnife Stereotactic Radiosurgery for Single Brain Metastasis
J. Wang, L. Pan, B. Qu, M. Bodduluri, X. Dai, J. Zhongjian, C. Wang, J. Bai, S. Xu*

PO-GePV-T-380 : Direct Dosimetric Comparison of LINAC Vs GK FSRT for Large Brain Tumors
Z. Whiting*, E. Calugaru, D. Ma, B. Garcia, M. Keohane, A. Goenka, J. Chang

PO-GePV-T-381 : Dosimetric Evaluation of Lung Stereotactic Body Radiation Therapy (SBRT) Treatment Plans
T. Giaddui*, B. Wang, A. Hollander, B. Micaily, C. Miyamoto, S. Li

PO-GePV-T-382 : Thoracic Spine SBRT: Is Free Breathing CT Sufficient for VMAT Planning?
K. Xu*, Y. Zhang, J. Zhou, N. Yue, C. Ma

PO-GePV-T-383 : Variance in DVHs Based On Machine Repeatability
C. Kabat*, H. Parenica, N. Papanikolaou, S. Stathakis

PO-GePV-T-384 : Comparison of Monte Carlo and Pencil Beam Algorithms in Brain Dose Calculations for Stereotactic Radiosurgery of Multiple Brain Metastases
H. Jiang*, R. Badkul, N. Demez, D. Johnson, D. Soultan, D. Craft

PO-GePV-T-385 : Algorithm for Forward SBRT Planning with Constant Dose Rate Flattening Filter Free Dynamic Conformal Arcs
J. Barbiere*, G. Beninati, R. Teboh Forbang, A. Ndlovu

PO-GePV-T-386 : The Influence of Iso-Center Location, Beam Type and Lesion Size On Plan Specific QA in Lung SBRT
S. Mashouf*, A. Bauer, S. Tripathi

PO-GePV-T-389 : Dosimetric Impact of Peripheral MLC Leaves for Stereotactic Radiosurgery
X. Zhao*, E. Covington, A. Alexandrian, R. Popple

PO-GePV-T-390 : Organ-At-Risk Motion Analysis for Pancreatic Tumor Stereotactic Radiotherapy
T. Gray*, C. Liu, B. Guo, D. LaHurd, E. Balagamwala, A. Vassil, P. Xia

PO-GePV-T-391 : Intra-Fraction Motion
of Brain SRS/SRT with Multiple Targets:
Evaluation Based On a Robotic Radiosurgery System

X. Chen*, L. Jin, L. Chen, J. Liu, L. Wang, S. Hayes, S. Weiss, R. Price, C. Ma

PO-GePV-T-392 : Brain Stereotactic Radiosurgery Using MR-Guided Online Adaptive Planning to Daily Setup Variation: An End-To-End Test
E. Han*, H. Wang, T. Briere, D. Yeboa, T. Boursianis, G. Kalaitzakis, E. Pappas, P. Castillo, J. Yang

PO-GePV-T-393 : Optimizing Isocenter Placement Based On Rotational Uncertainty in Single-Isocenter SRS
C. Baley*, N. Kirby, S. Stathakis, N. Papanikolaou, P. Myers, K. Rasmussen, D. Saenz

PO-GePV-T-394 : Dosimetric Study of the Electron Return Effect On Breast Treatment Planning On a 1.5 T MR-LINAC
J. Park*, T. Chiu, Y. Park, X. Gu, A. Godley, Y. Zhang

PO-GePV-T-397 : New Dosimetric Guidelines for Acuros Through Comparative Evaluation of SBRT Lung Treatment Plans Against AAA
M. Pacella*, M. Webster, S. Tanny, N. Joyce, L. Constine, M. Milano, I. Yeo

PO-GePV-T-398 : Evaluation of Dosimetric Uncertainties in Small Fields of the Varian EDGE Radiosurgery System Using Monte Carlo Simulations
T. Neupane*, C. Shang, W. Muhammad, T. Leventouri

PO-GePV-T-399 : Automatic Spine SBRT Treatment Planning Using Pinnacle Scripting
P. Qi*, S. Chao, E. Murphy, E. Balagamwala, J. Suh, P. Xia

PO-GePV-T-402 : Clinical Implementation of PDT Dose and Reactive Oxygen Species Explicit Dosimetry (ROSED) for Pleural Photodynamic Therapy (pPDT)
Y. Ong*, A. Dimofte, K. Cengel, T. Zhu

PO-GePV-T-403 : Impact of Dose Calculation Algorithm On Airway Dosimetry: Comparison of AAA and Acuros
P. Kinkopf*, A. Modiri, K. Yu, Y. Yan, P. Mohindra, R. Timmerman, A. Sawant, E. Vicente

PO-GePV-T-404 : Dosimetric Comparison of Gamma Knife® Icon and Linear Accelerator-Based FSRT Plans for the Re-Irradiation of Recurrent Glioblastomas
A. Kyler*, H. Liu, A. Ali, W. Shi, Y. Yu, K. Mooney

PO-GePV-T-405 : Comparison of Ray Tracing and Monte Carlo Algorithms for Spine Lesions Treated with CyberKnife
J. Li*, X. Zhang, Y. Pan, H. Zhuang, R. Yang

PO-GePV-T-406 : Treatment Planning of Intra-Cranial Lesions with Zap Surgical & Comparison with CyberKnife
M. Zaman*, T. Loysel, L. Goganovic, J. Ducote

PO-GePV-T-407 : Dosimetric Case Study of Lung SBRT with Two Adjacent Targets: One ISO Vs Two ISOs
J. Zhang*, B. Lee, W. Inouye, R. Kwon, W. Lien

PO-GePV-T-408 : Can a Single Beam Model Be Used for SBRT Planning On Multiple Linear Accelerators?
S. Wang*, J. Cunningham, S. Devpura, K. Snyder, C. Smith, B. Miller, S. Gardner

PO-GePV-T-409 : A Trajectory Sampling Metric for the Optimization of Dose Distributions in Radiosurgery
R. MacDonald*, J. Lincoln, C. Church, A. Syme, C. Thomas

PO-GePV-T-410 : Predictive Model of Lung Tumor Intrafraction Motion Variability
L. Knybel*, J. Cvek, M. Penhaker

PO-GePV-T-412 : How Low Can We Go? Modified HyperArc VMAT Geometry for Recurrent Head and Neck SRT
D. Pokhrel*, M. Kudrimoti, M. Bernard

PO-GePV-T-413 : Single Fraction SRS Planning Strategies for Dual Metastases Have Different Doses
M. Alfishawy*, M. Abdallah, A. Yassin, K. El-Shahat, I. Hajjaj, A. Mahmoud, R. Hamed, B. Dawood, A. Elsaeed, N. Gebriel, H. Attallah

PO-GePV-T-414 : Treatment of Brain Metastases with ZAP-X and CyberKnife: A Dosimetric Comparison
Y. Niu*, A. Rashid, M. Carrasquilla, B. Collins, D. Pang

PO-GePV-T-415 : Dosimetric Evaluation of the Galaxy Rotating Gamma System for SRS/SRT
H. Liu*, A. Eldib, L. Chen, B. Wang, S. Li, C. Miyamoto, C. Ma

PO-GePV-T-416 : Northwestern Memorial Hospital’s Experiences in Gamma Knife ICON Unit in First 15 Months
P. Lee*, G. Khelashvili, M. Gopalakrishnan, S. Sachdev, J. Kalapurakal, T. Kruser

PO-GePV-T-417 : Appropriate Modality for Salvage Radiation Therapy for Local Failure After Primary Lung SBRT
T. Arsenault*, K. Lyons, A. Gross, T. Biswas, M. Yao, N. Azar, C. Towe, T. Podder

PO-GePV-T-418 : An Innovative Modification of a Commercial Mask Used in Gamma Knife Icon Stereotactic Radiosurgery
R. He*, W. Duggar, E. Mundra, S. Vijayakumar, C. Yang

PO-GePV-T-419 : Measuring Cone Factors for Stereotactic Radiosurgery Applicators On a Varian Edge
S. Tanny*, J. Yoon, M. Ostyn, A. Gray

PO-GePV-T-420 : Dosimetric Comparison of Coplanar and Noncoplanar Beam Arrangements for Radiotherapy of Patients with Lung Cancer: A Meta-Analysis
M. Ma*, J. Dai

PO-GePV-T-421 : End to End Verification of BrainLAB’s Element Planning System for Intracranial SRS Treatments of Arteriovenous
Malformations On Varian TrueBeam

N. Shrestha*, G. Narayanasamy, M. Radvany, F. Kalantari, S. Morrill, H. Su, F. Xia

PO-GePV-T-422 : Characterization of Single-Dose Radiotherapy (SDRT) Performance in a New High-Speed Ring Gantry-Based LINAC System
O. Oderinde*, S. Khan, A. Da Silva, S. Tian, X. Yang, K. Higgins, S. Shirvani, G. Kuduvalli

PO-GePV-T-423 : Feasibility Study of Precision-CyberKnife, IPlan-Novalis, Raystation-VersaHD and Monaco-VersaHD to Satisfy the UNC Treatment Planning Protocol of Stereotactic Radiosurgery for Multiple Brain Lesions
P. Mavroidis*, R. McGurk, E. Schreiber, M. Dance, K. Zourari, G. Kalaitzakis, E. Zoros, T. Boursianis, E. Pappas, B. Read, P. Barry, N. Papanikolaou, S. Das, S. Stathakis

PO-GePV-T-424 : Effect of Dose Rate On Cardiac Synchronized Volumetric Modulated Arc Therapy
J. Poon*, K. Kohli, D. Schellenberg, M. Deyell, S. Thomas

PO-GePV-T-426 : Dosimetric Evaluation of Different Rotating Gamma Ray System Designs
A. Eldib*, H. Liu, Q. Jiang, B. Wang, S. Li, C. Miyamoto, C. Ma

PO-GePV-T-430 : Investigation On the Use of Comet Assay for the Measurement of High Dose Radiation
J. Lourdhurajan*, S. Rabi, T. Peace, R. SINGH

PO-GePV-T-433 : The Plant Hemoglobin Can Be Developed as a Radio-Enhancer in Solid Tumor Radiation Treatment
S. Yasmin-Karim*, J. Wood, M. Moreau, W. Ngwa

PO-GePV-T-434 : Investigate Depth-Dependent Dose Enhancement of PSMA-Targeted Gold Nanoparticles Assisted Radiosensitization at Megavoltage Energy
D. Hara*, J. Shi, R. Schmidt, W. Tao, W. Ma, N. Dogan, J. Ford, A. Pollack

PO-GePV-T-435 : A Treatment Planning System for Small Animal Radiation with the Gamma Knife
J. Yuan*, A. Yuan, A. Kerstetter-fogle, C. Flask, S. Choi, A. Sloan, S. Brady-kalnay, R. Muzic, Y. Zheng

PO-GePV-T-436 : Analysis of Preclinical IMRT Plan Quality Versus Number of Beam Angles
D. Olivera Velarde*, E. Pearson, B. Aydogan, H. Halpern, G. Redler, B. Epel, J. Slagowski

PO-GePV-T-437 : Precise Pulse Delivery Control Using Monitor Units in Electron FLASH-RT
J. Xu*, Y. Poirier, A. Sawant

PO-GePV-T-438 : Dosimetry and Quality Assurance for the Small Animal Radiation Research Platform (SARRP)
R. Mueller*, S. Aldelaijan, M. Moreau, W. Ngwa, G. Makrigiorgos, R. Berbeco

PO-GePV-T-439 : Evaluation of A New Method to Measure Colony Growth In-Vitro
R. Holden*, J. Park, A. Lynnette Price, D. Dunn, S. Floyd, M. Oldham

PO-GePV-T-440 : Radiation Cell Survival Fraction After a FLASH Radiation Pulse
S. Zhou*, Y. Yan, D. Zheng, S. Wang, S. Wisnoskie, D. Umstadter

PO-GePV-T-441 : A Study of Indirect Apoptotic Death by Vascular Damage On Cell Survival After Single-Fraction Radiotherapy by Using An Improved Cellular Automata Model
D. Kawahara*, L. WU, Y. Nagata, Y. Watanabe

PO-GePV-T-442 : EQD2 of HDR Brachytherapy for Vaginal Cancer Based On a Novel Model
B. Wang*, S. Li, B. Micaily, A. Hollander, T. Giaddui, C. Miyamoto

PO-GePV-T-443 : Effect of Total and Hypoxic Tumor Volumes on the TCP in Hypofractionated Radiotherapy
A. Chvetsov*, R. Stewart, L. Hanin, J. Zeng, R. Rengan, S. Lo

PO-GePV-T-444 : A Biology-Driven Deep-Learning Based Cell Survival Model for Proton Radiation
Y. Lai*, C. Shen, Y. Chi, F. Guan, X. Jia

PO-GePV-T-445 : Relative Response of Murine Lung Tumors From Conventional Radiotherapy (CRT) Versus Pulsed Low-Dose-Rate (PLDR) Radiotherapy
T. Dos Santos*, D. Cvetkovic, L. Chen, C. Ma

PO-GePV-T-447 : DNA-Scale Dose Deposition Surrounding Heavy-Metal Nanoparticles Irradiated with a Monoenergetic Kilovoltage-Energy Beam
N. Myziuk*, E. Porter, M. Snyder

PO-GePV-T-448 : Alpha Particle Microdosimetry Calculations Aided by Shallow Neural Network Regression Fitting
P. Wagstaff*, P. Mínguez Gabiña, J. Roeske