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Variation in patient dose due to differences in calibration and dosimetry protocols

【摘要】Forpreciseandaccuratepatientdosedelivery,thedosimetrysystemmustbecalibratedproperlyaccordingtotherecommendationsofstandarddosimetryprotocolssuchasTG-51andTRS-398.However,thedosimetryprotocolfollowedbyacalibrationlaboratoryisusuallydifferentfromtheprotocolsthatarefollowedbydifferentclinics,whichmayresultinvariationsinthepatientdose.Ourprimeobjectiveinthisstudywastoinvestigatetheeffectofthetwoprotocolsondosimetrymeasurements.DosemeasurementswereperformedforaCo-60teletherapyunitandahigh-energyVarianlinearacceleratorwith6and15MVphotonand6,9,12,and15MeVelectronbeams,followingtherecommendationsandproceduresoftheAAPMTG-51andIAEATRS-398dosimetryprotocols.ThedosimetrysystemsusedforthisstudywerecalibratedinaCo-60radiationbeamattheSecondaryStandardDosimetryLaboratory(SSDL)PINSTECH,Pakistan,followingtheIAEATRS-398protocol.Theratioofthemeasuredabsorbeddosestowaterinclinicalsetting,Dw(TG-51/TRS-398),was0.999and0.997for6and15MVphotonbeams,whereastheseratioswere1.013,1.009,1.003,and1.000for6,9,12,and15MeVelectronbeams,respectively.Thisdifferenceintheabsorbeddosesto-waterDwratiomaybeattributedmainlyduetobeamquality(KQ)andionrecombinationcorrectionfactor.

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139 共6页 核技术:英文版 2018年5期 免费 中文科技期刊数据库

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