中国医学装备
中國醫學裝備
중국의학장비
CHINA MEDICAL EQUIPMENT
2014年
5期
27-29
,共3页
半野照射%剂量计算%优化研究
半野照射%劑量計算%優化研究
반야조사%제량계산%우화연구
Semi-field irradiation%Filed matching technique%Dose calculation
目的：探讨半野照射中利用修正因子修正常用剂量计算公式，提高半野照射剂量计算准确性。方法：使用带有独立准直器的直线加速器实施不同等效边长照射野的半野照射，比较半野照射剂量计算值与实测值，并通过数据拟合得出修正因子随等效边长的数学关系。结果：修正因子随面积增加而增大，存在一定数学关系；经修正后剂量计算值与实测值更接近，准确度比常用临床剂量计划系统更高。结论：半野修正因子可以简便地优化剂量计算，提高了半野照射剂量计算的准确性。
目的：探討半野照射中利用脩正因子脩正常用劑量計算公式，提高半野照射劑量計算準確性。方法：使用帶有獨立準直器的直線加速器實施不同等效邊長照射野的半野照射，比較半野照射劑量計算值與實測值，併通過數據擬閤得齣脩正因子隨等效邊長的數學關繫。結果：脩正因子隨麵積增加而增大，存在一定數學關繫；經脩正後劑量計算值與實測值更接近，準確度比常用臨床劑量計劃繫統更高。結論：半野脩正因子可以簡便地優化劑量計算，提高瞭半野照射劑量計算的準確性。
목적：탐토반야조사중이용수정인자수정상용제량계산공식，제고반야조사제량계산준학성。방법：사용대유독립준직기적직선가속기실시불동등효변장조사야적반야조사，비교반야조사제량계산치여실측치，병통과수거의합득출수정인자수등효변장적수학관계。결과：수정인자수면적증가이증대，존재일정수학관계；경수정후제량계산치여실측치경접근，준학도비상용림상제량계화계통경고。결론：반야수정인자가이간편지우화제량계산，제고료반야조사제량계산적준학성。
Objective: A correction factor was proposed to improve the accuracy of dose calculation in conventional radiotherapy when filed matching technique was used. Methods:Use the linear accelerator with independent collimator to implement semi-field irradiation under different equivalent-length field. Measure the dose and compare it with the calculation dose. Obtain a correction factor which change follow the equivalent-length through data fitting. Results:There is relationship to indicate the correction factor increase if the field area enlarge;the calculation dose will be close to the measure dose, and the accuracy will improve by correcting;Conclusion:The clinical dose of semi-field irradiation can be calculated by an equivalent square field technique , and then multiplied by the correction factor. it is a simple method to improve the accuracy of dose calculation in conventional radiotherapy by using semi-filed correction factor when filed matching technique was used.
