1、HBCH RADIOTHERAPY DEPARTMENTX()射线射野剂量学HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT不同位置的准直器对钴-60射线建成效应的影响0100HBCH RADIOTHERAPY DEPARTMENT不同射线深度剂量特性的比
2、较0100HBCH RADIOTHERAPY DEPARTMENT能量对百分深度剂量的影响100HBCH RADIOTHERAPY DEPARTMENT射野面积对深度剂量的影响HBCH RADIOTHERAPY DEPARTMENT射野面积和形状对深度剂量的影响HBCH RADIOTHERAPY DEPARTMENTELEKTA MLCi 15MV PDD Table02040608010012005101520253035DEPTH%DOSE223344556688101 0121 2151 5181 8202 0252 5303 0353 5404 0HBCH RADIOTHERAPY D
3、EPARTMENT射野面积对深度剂量的影响HBCH RADIOTHERAPY DEPARTMENT射野面积等效方形矩形）（42sbabaPAbaabs2HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT源皮距对深度剂量的影响sdmdAfdKeAAPDD）（），（10%100011SdmdmKedfdf）（211%100SdmdmAfdKedfdfPDD）（222),(%100021FdfdfdfdfPDDPDDmmAfdAfd211222),(),(011021SSf1f2dddmdmF因数校正法sdmdAfdKeAAPDD）（），
4、（10%100011SdmdmKedfdf）（211%100SdmdmAfdKedfdfPDD）（222),(%100021FdfdfdfdfPDDPDDmmAfdAfd211222),(),(011021SSf1f2dddmdmK因数校正法HBCH RADIOTHERAPY DEPARTMENT组织空气比（Tissue Air Ratio）SSHBCH RADIOTHERAPY DEPARTMENT组织空气比（Tissue Air Ratio）HBCH RADIOTHERAPY DEPARTMENT组织空气比（Tissue Air Ratio）HBCH RADIOTHERAPY DEPART
5、MENT组织空气比（Tissue Air Ratio）HBCH RADIOTHERAPY DEPARTMENT反散因子HBCH RADIOTHERAPY DEPARTMENT反散因子HBCH RADIOTHERAPY DEPARTMENTTAR与PDD的关系 =()2HBCH RADIOTHERAPY DEPARTMENTTAR与PDD的关系HBCH RADIOTHERAPY DEPARTMENT f+dmHBCH RADIOTHERAPY DEPARTMENTTAR与PDD的关系 f+dmHBCH RADIOTHERAPY DEPARTMENT不同SSD时 PDD的计算TAR法2110,11
6、)(1),(),(1dfdfABSFAdTARAfdPDDmfd2220,22)(1),(),(2dfdfABSFAdTARafdPDDmfd不同SSD时PDD的计算TAR法（1）（2）212221,1122),(),(),(),(12mmfdfddfdfdfdfAdTARAdTARAfdPDDAfdPDDFAdTARAdTARfdfd),(),(21,两式相比得：FABSFFABSFfFAdPDDafdPDD)()/(),(),(01122不同SSD时PDD的计算TAR法若无TAR表，可由下式计算：HBCH RADIOTHERAPY DEPARTMENT旋转治疗的剂量计算)HBCH RADI
7、OTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTTAR的特点HBCH RADIOTHERAPY DEPARTMENT组织体模比(Tissue Phantom Ratio TPR)HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT原射线和散射线HBCH RADIOTHERAPY DEPARTMENT原射线和散射线HBCH RADIOTHERAPY DEPARTMENTTMR的应用HBCH RADIOTHERAPY DEPARTMENT
8、射野输出因子（OUF）HBCH RADIOTHERAPY DEPARTMENT射野输出因子HBCH RADIOTHERAPY DEPARTMENT射野输出因子的测量HBCH RADIOTHERAPY DEPARTMENT平衡帽的问题HBCH RADIOTHERAPY DEPARTMENT两种建成帽计算零野TMR的结果比较HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT体模散射校正因子（Sp）HBCH RADIOTHERAPY DEPARTMENT总散射校正因子（Sc,p）HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENTTMR 与 PDD 的关系)()(),(),(2dpmpmdFSZSFSZSdfdffFSZdPDDFSZdTMRfdfFSZFSZfdfFSZFSZSSDfmmd上式中：对加速器：对钴-60：)(),(),(dddFSZBSFFSZdTARFSZdTMRHBCH RADIOTHERAPY DEPARTMENTTMR 随射野的变化HBCH RADIOTHERAPY DEPARTMENTHBCH RADIOTHERAPY DEPARTMENT
