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- W2382123505 abstract "OBJECTIVE:To verify the 3Ddose of volumetric-modulated arc therapy(VMAT)and evaluate the impact of delivery parameter errors on clinical dose variation based on Linac log files.METHODS:Ten clinically acceptable RapidArc treatment plans were generated for rectum cancers.Using the program developed inhouse converted the data in the log files to the actual delivery parameters,multileaf collimator(MLC)positions,gantry angle,and monitor unit(MU).The errors of the delivery parameters were compared respectively.The extracted parameters were used to replace the corresponding parameters in the original treatment plan file.The 3Ddose distribution was reconstructed on the original CT.The effect of the 3Ddose distribution difference that caused by the delivery parameters between the reconstructed plan and the the origin plan was analyzed.RESULTS:The gantry angle,MU and MLC leaf position errors for all patients were1°,0.2MU and2mm(mostly between 0.05 mm and 1mm),respectively.The impact of MLC leaf position errors on PTV(planning target volume)V100(the volume involved by prescription dose)was noticeable and the difference had statistical significance(P=0.006);The impact of gantry angle and MU errors on PTV V100 was little and the difference was not significant(P0.05);The delivery parameter errors had no obvious dosimetric impact on the accuracy of organs at risk including the small intestine V40(the volume involved by 40 Gy dose),bladder V40,femoral head V30(the volume involved by 30 Gy dose)and the differences were not significant(P0.05).CONCLUSIONS:It was feasible to verify the 3D dose of volumetric-modulated arc therapy(VMAT)using Linac log files.The impact of MLC leaf position errors on the dose of PTV was noticeable but the impact of gantry angle and MU errors on PTV was little;The delivery parameter errors had no obvious dosimetric impact on the accuracy of organs at risk." @default.
- W2382123505 created "2016-06-24" @default.
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- W2382123505 date "2014-01-01" @default.
- W2382123505 modified "2023-09-26" @default.
- W2382123505 title "3D dosimetric verification of volumetric-modulated arc therapy using Linac log files" @default.
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