Fast MCsquare-Based Independent Dose Verification Platform for Pencil Beam Scanning Proton Therapy
Y Zhang1*, C Liu2, M Ho3, J Park1, W Hsi1, X Liang1, Z Li4, y song5, H Feng5, (1) University of Florida Proton Therapy Institute, Jacksonville, FL, (2) University of Science and Technology of China, Hefei, ,CN, (3) Johns Hopkins Medicine, Washington, DC, (4) Concord Medical Group, Guangzhou, Guangdong, CN, (5) Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, CN
Presentations
WE-B-TRACK 6-4 (Wednesday, 7/28/2021) 11:30 AM - 12:30 PM [Eastern Time (GMT-4)]
Purpose: Secondary dose verification has not been introduced to proton therapy as a routine practice. The purpose of this study is to commission MCsquare (a multi-cores CPU-based dose calculation engine), integrate it into RayStation treatment plan system (TPS) to create a dedicated platform for fast, independent pencil beam scanning (PBS) dose verification.
Methods: A MCsquare-based independent dose verification platform (MC2InRS) was developed to realize automatic dose re-calculation for clinical use, including data preparation, dose calculation, 2D/3D gamma analysis. MCsquare was commissioned based on in-air lateral dose profiles, integrated depth dose, and the absolute dose of different beam energies for Proteus®ONE. It was then integrated into RayStation using Python to build the independent dose verification platform - MC2InRS. MC2InRS was validated with measurement data using various targets and depths in a water phantom. This study also investigated fifteen clinical cases to demonstrate the feasibility and effectiveness of MC2InRS platform in clinic practice.
Results: Between simulation and measurement, the distal range differences at 80% (R80) and 20% (R20) dose levels for each energy were below 0.05 mm, and 0.1 mm, respectively, and the absolute dose differences were below 0.5%. 29 out of 36 QA planes reached a 100% gamma passing rate (GPR) for 2%/2mm criteria, and a minimum of 98.3% gamma was obtained in water phantom between simulation and measurement. For the 15 clinical cases investigated, the average 2D GPR (2%/2mm) was 95.4%, 99.3% for MCsquare vs. measurement, MCsquare vs. TPS, respectively. The average 3D GPR (2%/2mm) was 98.9%, 95.3% for MCsquare vs. TPS in water, and computed tomography (CT), respectively.
Conclusion: A fast, independent dose verification platform – MC2InRS, has been developed to perform dose verification with high accuracy and efficiency for Pencil Bream Scanning (PBS). The feasibility of using MC2InRS in routine clinical practice has also been demonstrated.
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