CAJ | 학술논문

目的针对我国自主生产的某型伽玛刀,建立一套快速、准确的蒙特卡罗算法模型,并利用所建立的模型对伽玛刀剂量场特性进行研究.方法利用蒙特卡罗核粒子输运程序建立伽玛刀的蒙特卡罗算法模型,并用实验结果对模拟结果进行验证.结果离轴比:和实验结果符合良好,随着准直器孔径的减小,顶部剂量率平台随之减小,半影区也有减小的趋势但不明显;等剂量曲线:旋转轴垂直平面上的剂量梯度最小.结论 (1)所建立蒙特卡罗算法模型是准确有效的;(2)在制定治疗计划时,需要考虑到肿瘤和体表距离、肿瘤大小、形状以及射野不均匀性带来的影响.
목적 침대아국자주생산적모형가마도,건립일투쾌속、준학적몽특잡라산법모형,병이용소건립적모형대가마도제량장특성진행연구.방법 이용몽특잡라핵입자수운정서건립가마도적몽특잡라산법모형,병용실험결과대모의결과진행험증.결과 리축비:화실험결과부합량호,수착준직기공경적감소,정부제량솔평태수지감소,반영구야유감소적추세단불명현;등제량곡선:선전축수직평면상적제량제도최소.결론 (1)소건립몽특잡라산법모형시준학유효적;(2)재제정치료계화시,수요고필도종류화체표거리、종류대소、형상이급사야불균균성대래적영향.
Objective To build a Monte Carlo model of a type of gamma knife independently produced in China, and prove the accuracy of this model and study dose field characteristics of the gamma knife.Methods Monte Carlo model was built based on Monte Carlo N-Particle Transport Code, and the simulation result was verified by the experiment results.Results Off Axis Ratio: the simulation result of Off Axis Ratios was in good agreement with the experiment results, the top dose rate platform decreased with the radium of the collimators reduced, penumbra decreased to some degree but not obviously;isodose curves : the dose gradient of the plane perpendicular to rotate axis was minimum.Conclusions (1)The Monte Carlo model was accurate and effective.(2)The distance between the tumor and body surface, the size, shape of the tumor and the heterogeneity of exposure field need to be considered when the treatment plan is developed.