EVALUATION OF PATIENT SPECIFIC PRE-TREATMENT QUALITY ASSURANCE TEST FOR HEAD AND NECK CANCER BASED ON A TRAJECTORY LOG FILE AND MEASUREMENT ON EPID BEFORE TREAT FOR PATIENT

Abstract

For the clinical implementation of a new technique, it is necessary to check the dose calculated by the dose calculation algorithm. The Intensity-modulated radiotherapy (IMRT) technique make isodoses conform to tumor volume and reduce the dose to the organ at risk (OAR), there are increasing the complexity of it. The purpose of the paper is based on the sensitivity of the Trajectory log file to patient-specific pretreatment quality assurance test and detecting the leaf position errors of
Multileaf collimator (MLC), the gantry angle error, the collimator angle error that are the parameters obtained from the Trajectory log file. Comparing the resultspatient-specific quality assurance of accepting the plan between built by Trajectory log file and treatment planning system (TPS) with the results of accepting the plan measured by an electronic portal imaging device (EPID) and TPS in the same tolerance criteria DM/ dM (3%/3mm).