利用二维电离室矩阵进行调强放疗计划剂量验证的探讨

Discussion on Dose Verification of IMRT Plans with 2D Ionization Chamber Array

目的：探讨二维电离室矩阵在调强放疗（IMRT）计划剂量验证中的应用价值。方法选取于我院行IMRT的患者16例，先在治疗计划系统中进行计划设计，然后移植到固体水上，得到体模杂交计划；利用二维电离室矩阵对杂交计划的计算剂量进行验证；参照3%/3 mm标准对结果进行分析。结果所有治疗野的绝对剂量验证结果通过率为86.4%-100%；相对剂量验证结果通过率为88.5%-100%。结论二维电离室矩阵是一种快速的剂量测量系统，在IMRT计划剂量验证中有重要价值。

Objective To explore the application value of 2D ionization chamber array in the dose verification of IMRT plans. Methods IMRT plans of 16 patients who would undergo IMRT in our hospital were designed through treatment planning system and then were migrated to solid water to obtain phantom hybrid plans. Then the dose veriifcation of phantom hybrid plans was conducted with 2D ionization chamber array. The veriifcation results were analyzed according to 3%/3 mm criterion. Results The passing rate scope of absolute dose veriifcation results of all radiation ifelds was 86.4%~100%while that of relative dose veriifcation results of all radiation ifelds was 88.5%~100%. Conclusion As a fast dose measurement system, 2D ionization chamber array plays an important role in the dose veriifcation of IMRT plans.