Evaluation Study of the Dose Volume Histogram (DVH) Calculated and Measured of the Radiotherapy for Prostate Cancer Patients

Abstract

Patient-specific QA is vital to the successful implementation of advanced techniques in radiotherapy. It checks the accuracy of MLCs calculation, dose calculation, plan transfer, and treatment delivery to ensure correct machine-sided delivery of the prescribed dose. Treatment plans for thirty prostate cancer patients who received 76 Gy in 38 fractions with IMRT and VMAT were generated by TPS “Eclipse” V 13.7.14 was used to generate. These plans were calculated using photon beams with an energy of 10 MV from the Clinac® iX System. Five fields IMRT(140⁰, 60⁰, 0⁰, 300⁰, and 220⁰) were optimized by setting the collimator and couch to zero. Whereas VMAT plans used clockwise (CW) and counterclockwise (CCW) partial arcs (from 230⁰ to 130⁰) with collimator rotation (15⁰/ 345⁰) respectively. Using the anisotropic analytical algorithm (AAA), all dose calculations were performed in Eclipse planning system. Verification plans were created in the TPS using the ArcCHECK phantom. ArcCHECK phantom is a cylindrical phantom with a 3D array of 1386 diode detectors organized in a spiral design and spaced at 10 mm. The predicted distribution of dose was interpreted using ArcCHECK V6.7.3 and 3DVH.