Dosimetric Evaluation of O-Arm Cone Beam Computed Tomography (CBCT) Scan Modes for Pediatric Head Scans
Presentations
PO-GePV-I-1 (Sunday, 7/25/2021) [Eastern Time (GMT-4)]
Purpose: To evaluate the additional doses to pediatric patients while using various CBCT acquisition modes in an O-arm and compare the volume Computed Tomography Dose Index (CTDIᵥ) values to conventional CT scans.
Methods: O-arms (O2 O-arm, Medtronic, Minneapolis, MN) are increasingly being used for neurosurgery and interventional procedures in clinical settings for pediatric patients. Due to the latent carcinogenic risks of radiation and increased life expectancy of pediatric patients, doses accrued during surgical procedures is a serious concern, in addition to doses from pre-op conventional CT scans. To analyze this further, CTDIᵥ measurements were performed for various pediatric patient sizes and O-arm acquisition modes including standard, low dose, HD3D and enhanced3D. The CTDIᵥ values obtained for all patient sizes were averaged and compared to a Stealth and reference pediatric head protocol used in clinical practice.
Results: The CTDIᵥ values measured were 16.7, 7.3, 25.2 and 70.2 mGy for standard, low dose, HD3D and enhanced3D modes respectively. The doses from conventional CT stealth protocol and reference pediatric head protocol were 32.4 and 33.7 mGy, respectively.
Conclusion: Based upon the measured CTDIᵥ values, all modes except enhanced3D will result in lower radiation risk to pediatric patients when compared to conventional CT scans. Low dose mode is recommended for image registration purposes, if image quality is not a concern, to minimize radiation burden. Enhanced3D mode should only be utilized if the benefits outweigh the risks for diagnostic purposes.
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Keywords
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Taxonomy
IM- Cone Beam CT: Radiation dosimetry & risk
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