SU‐E‐T‐764: Track Repeating Algorithm for Proton Therapy Applied to Intensity Modulated Proton Therapy for Head‐And‐Neck Patients

TL;DRAbstract

Purpose: To determine the suitability of fast Monte Carlo techniques for dose calculation in particle therapy based on track‐repeating algorithm for Intensity Modulated Proton Therapy, IMPT. The application of this technique will make possible detailed retrospective studies of large cohort of patients, which may lead to a better determination of Relative Biological Effects from the analysis of patient data. Methods: A cohort of six head‐and‐neck patients treated at the University of Texas MD Anderson Cancer Center with IMPT were utilized. The dose distributions were calculated with the standard Treatment Plan System, TPS, MCNPX, GEANT4 and FDC, a fast track‐repeating algorithm for proton therapy for the verification and the patient plans. FDC is based on a GEANT4 database of trajectories of protons in a water. The obtained dose distributions were compared to each other utilizing the g‐index criteria for 3mm‐3% and 2mm‐2%, for the maximum spatial and dose differences. The γ‐index was ca

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