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针对临床剂量学验证中二维评价方法只能反映每张平片上剂量分布情况,并根据剂量引导精确放疗系统中三维剂量验证需求设计算法实现对三维剂量分布的比较。根据公式,在Visual C++控制台下实现剂量偏差、位置偏差及γ分析三维评价算法。设计两个计划进行算法验证:计划1为方野照射等效水,用于验证算法的正确性;计划2为适形野照射仿真头模,用于验证算法的实用性。结果表明,计划1中,对剂量偏差,容许值范围内通过率为100%;对位置偏差和γ分析,容许范围内通过率为100%,容许边界值处为100±7.7%。计划2中,3种算法通过率分别为88.35%、100%和95.07%。这说明该算法可用于剂量引导精确放疗系统中实现三维剂量分布的评价。
The two-dimensional evaluation method in clinical dosimetry verification can only reflect the dose distribution on each plain film, and the comparison of three-dimensional dose distribution can be realized according to the three-dimensional dose verification requirement design algorithm in dose-guided radiotherapy system. According to the formula, under the Visual C + + console to achieve dose deviation, position deviation and γ analysis of three-dimensional evaluation algorithm. Two schemes are designed to validate the algorithm: Plan 1 irradiates the field with equivalent water, which is used to verify the correctness of the algorithm. Scheme 2 is a conformal field illumination simulation head model, which is used to verify the practicability of the algorithm. The results showed that in case 1, dose rate deviation was within 100% of the allowable value. For the position deviation and γ analysis, the allowable range of passing rate was 100% and the allowable boundary value was 100 ± 7.7%. In the second plan, the passing rates of the three algorithms are respectively 88.35%, 100% and 95.07%. This shows that the algorithm can be used in dose-guided precision radiotherapy system to achieve three-dimensional dose distribution evaluation.