1.文章在90年代初出现（国内2000年后），03年参加放疗标准化临床试验，06、08、09年还有技术改进文章(PublishedOnlineAugust212006)OriginalArticleAnevaluationofthreetangentialbreastirradiationtechniquesinHongKongMariaY.Y.Lawa1c1,FionW.K.Cheunga1,VincentW.C.Wua1,VenusW.C.Tsanga1,RainnieW.Y.Kwana1,JohnnyY.T.Chenga1andFatsonK.F.Wonga1a1DepartmentofOptometryandRadiography,HongKongPolytechnicUniversity,HongKongArticleauthorquerylawmy[PubMed][GoogleScholar]cheungfw[PubMed][GoogleScholar]wuvw[PubMed][GoogleScholar]tsangvw[PubMed][GoogleScholar]kwanrw[PubMed][GoogleScholar]chengjy[PubMed][GoogleScholar]wongfk[PubMed][GoogleScholar]AbstractBackgroundandPurpose:Loco-regionalradiotherapyafterbreastconservingsurgerysignificantlyreducestheriskofrecurrencebutmayinducecomplicationsinthelungs.Thecomplicationsarerelatedtothelungvolumeirradiatedandthelungdosedelivered.Thepurposeofthisstudywastoevaluatethreetangentialbreastirradiationtechniquesi.e.conventionaltechnique,gantrytiltingtechniqueandhalf-beamblocktechniqueintermsofthepercentageofirradiatedlungvolumeandhighdoselungvolumeforpatientsofdifferentsizes.MaterialsandMethod:TreatmentplanningofthethreetangentialbreastirradiationtechniqueswasperformedusingtheCTscansof20patientswithearly-stagebreastcancerafterlumpectomy.Results:Whencomparedwithconventionaltechnique,bothhalfbeamblocktechniqueandgantrytiltingtechniqueirradiatedasignificantlysmallerpercentageoflungvolumeanddeliveredasmallerpercentageofhighdose(above30Gy)volumeinthelung.Patientswithlargebreastshadasignificantlyhigherpercentageoflungvolumeirradiatedtoabove30Gythanthosepatientswithsmallandmediumbreasts.Thecombinedeffectoftangentialseparationandtechniqueonlyproducedsignificanteffectonthepercentageoftotallungvolumeirradiatedbutnotonthehighdosevolume.Conclusions:Gantrytiltingandhalf-beamblocktechniquescanreduceasignificantamountoflungvolumeandhighdoselungvolume.Half-beamblocktechniqueisrecommendedforsmallandmediumbreastsizewhileforlargebreastsize,gantrytiltingtechniqueispreferred.###【2006online：】JournalofRadiotherapyinPractice(2000),2:1:9-15CambridgeUniversityPressCopyright©2000CambridgeUniversityPressdoi:10.1017/S1460396900000030OriginalArticleAnevaluationofthreetangentialbreastirradiationtechniquesinHongKongMariaY.Y.Lawa1c1,FionW.K.Cheunga1,VincentW.C.Wua1,VenusW.C.Tsanga1,RainnieW.Y.Kwana1,JohnnyY.T.Chenga1andFatsonK.F.Wonga1a1DepartmentofOptometryandRadiography,HongKongPolytechnicUniversity,HongKongArticleauthorquerylawmy[PubMed][GoogleScholar]cheungfw[PubMed][GoogleScholar]wuvw[PubMed][GoogleScholar]tsangvw[PubMed][GoogleScholar]kwanrw[PubMed][GoogleScholar]chengjy[PubMed][GoogleScholar]wongfk[PubMed][GoogleScholar]AbstractBackgroundandPurpose:Loco-regionalradiotherapyafterbreastconservingsurgerysignificantlyreducestheriskofrecurrencebutmayinducecomplicationsinthelungs.Thecomplicationsarerelatedtothelungvolumeirradiatedandthelungdosedelivered.Thepurposeofthisstudywastoevaluatethreetangentialbreastirradiationtechniquesi.e.conventionaltechnique,gantrytiltingtechniqueandhalf-beamblocktechniqueintermsofthepercentageofirradiatedlungvolumeandhighdoselungvolumeforpatientsofdifferentsizes.MaterialsandMethod:TreatmentplanningofthethreetangentialbreastirradiationtechniqueswasperformedusingtheCTscansof20patientswithearly-stagebreastcancerafterlumpectomy.Results:Whencomparedwithconventionalte...