SU-E-T-561: A Comparative Study of Single Verses Two Field Daily Fraction for Treatment of Prostate Cancer Using IMPT, Double-Scattered, and SUFD Delivery Technique

Medical Physics
Bijan ArjomandyH Gayar

Abstract

We conducted an investigation to evaluate the robustness of different proton therapy delivery technique for treatment of prostate cancer. Three commonly used delivery techniques; intensity modulated, double-scattered, and single field uniform dose delivery was investigated for one field verses two field daily fraction. Computer tomography (CT) for a patient was deformed based on acquired daily MVCTs obtained during the course of treatment by a Tomotherapy unit. The deformed CTs were used for proton planning retrorespectively using intensity modulated (IMPT), double-scattered (DSPT), and single field uniform dose (SFUD) delivery technique. The plans were evaluated for single-field versus two-field per fraction for each technique. The plans robustness was evaluated for each technique by comparing the maximum dose to rectum, bladder, prostate and CTV as well as the minimum dose to prostate and CTV. In addition, 95% coverage to prostate and CTV compared for each plan. The average and STD for deformed prostate volume was 22.4 ±0.5 (1s) for the course of treatment. On average the maximum dose delivered to rectum and bladder with single-field verses two-field IMPT were higher by 2.5%. With same respect, the single-field verses two-fie...Continue Reading

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