中华放射肿瘤学杂志
中華放射腫瘤學雜誌
중화방사종류학잡지
CHINESE JOURNAL OF RADIATION ONCOLOGY
2012年
2期
181-184
,共4页
直线加速器%X射线能谱%角分布%蒙特卡罗
直線加速器%X射線能譜%角分佈%矇特卡囉
직선가속기%X사선능보%각분포%몽특잡라
Linear accelerators%X-ray energy spectrum%Angular distribution%Monte Carlo
目的 研究医用直线加速器8 MV X射线的能谱结构,简化能谱结构的描述方式.方法 采用蒙特卡罗通用程序Geant4,对加速器产生的X射线能谱角分布和能谱结构进行研究.结果 通过对X射线能谱结构的调试形成具体加速器的虚拟X射线源,采用蒙特卡罗Gean4程序计算得出在该虚拟源辐射场中水模体内不同照射野的百分深度剂量以及照射野内不同深度处Profile剂量曲线与测量结果精确吻合.结论 放疗中具有相同能量的X射线都具有非常相近的能谱和能谱角分布,剂量学特性的细节差异反映了能谱角分布的细节差异.对利用测量剂量曲线快速建立源模型有着非常重要的意义.
目的 研究醫用直線加速器8 MV X射線的能譜結構,簡化能譜結構的描述方式.方法 採用矇特卡囉通用程序Geant4,對加速器產生的X射線能譜角分佈和能譜結構進行研究.結果 通過對X射線能譜結構的調試形成具體加速器的虛擬X射線源,採用矇特卡囉Gean4程序計算得齣在該虛擬源輻射場中水模體內不同照射野的百分深度劑量以及照射野內不同深度處Profile劑量麯線與測量結果精確吻閤.結論 放療中具有相同能量的X射線都具有非常相近的能譜和能譜角分佈,劑量學特性的細節差異反映瞭能譜角分佈的細節差異.對利用測量劑量麯線快速建立源模型有著非常重要的意義.
목적 연구의용직선가속기8 MV X사선적능보결구,간화능보결구적묘술방식.방법 채용몽특잡라통용정서Geant4,대가속기산생적X사선능보각분포화능보결구진행연구.결과 통과대X사선능보결구적조시형성구체가속기적허의X사선원,채용몽특잡라Gean4정서계산득출재해허의원복사장중수모체내불동조사야적백분심도제량이급조사야내불동심도처Profile제량곡선여측량결과정학문합.결론 방료중구유상동능량적X사선도구유비상상근적능보화능보각분포,제량학특성적세절차이반영료능보각분포적세절차이.대이용측량제량곡선쾌속건립원모형유착비상중요적의의.
Objective To study the spectrum structure of X-ray and simplify the description method of it. Methods By the general program of Monte Carlo Geant4 to study X-ray spectrum structure and angular distribution of X-ray energy spectrum. Results The results of percentage depth doses and profile curves at different depths of any radiation fields in water phantom calculated by Monte Carlo Geant4 were consistent with the measurements. Conclusions In radiotherapy, X-ray with same nominal energy have very similar dosimetry characteristics, this indicates they have very similar energy spectrum and angular distribution of spectrum. the differences of dosimetric details reflect the different details of the X-ray spectrum structure and angular distribution of X-ray energy spectrum. These studies have very important significances to rapidly build precise virtual source modeling for Monte Carlo calculation based on dose curves measurements in water phantom.
