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目的:研究分别采用Delta4和Arc Check三维探测器阵列对螺旋断层放疗系统(TOMO)的调强计划实施剂量验证的异同。方法:分别采用Scandi Dos公司Delta4三维半导体探测器阵列和Sun Nuclear公司Arc Check三维半导体探测器阵列对10例患者的TOMO调强放疗计划实施验证。通过TOMO系统MVCT成像和配准消除床面沉降的影响,确保实现两种三维探测器阵列的精确摆位。实施治疗质量保证(Delivery Quality Assurance,DQA)计划照射后将探测器阵列测量获得的平面剂量分布与TOMO计划系统模体计划计算获得的平面剂量分布进行比较。采用Gamma分析方法,选择多个不同的剂量标准分析评估验证情况。结果:阈值水平(Threshold,TH)分别为5%、10%、20%、70%、90%时,采用3%/2 mm、3%/3 mm、3%/4 mm、3%/5 mm四种不同剂量偏差/吻合距离剂量标准,γ≤1的平均通过率均超过94.1%,测量所得剂量分布与计算结果在相应平面的几何分布均呈现出良好的一致性。结论:两种三维探测器阵列各具特点,用于TOMO调强放疗计划验证能够获得令人满意的结果 。
OBJECTIVE: To study the similarities and differences of dosimetric verification of the TOMO program using Delta4 and Arc Check arrays respectively. METHODS: Ten TOMO IMRT plans were validated using the Scandi Dos Delta4 3D semiconductor detector array and the Sun Nuclear Arc Check 3D semiconductor detector array, respectively. Elimination of bed subsidence by TOMO system MVCT imaging and registration ensures accurate positioning of both 3D detector arrays. After the implementation of the Delivery Quality Assurance (DQA) plan irradiation, the planar dose distribution obtained by the detector array measurement was compared with the planar dose distribution calculated by the TOMO planning system phantom plan. Gamma analysis method, select a number of different dose criteria analysis to assess the validation. Results: Threshold was 3% / 2 mm, 3% / 3 mm, 3% / 4 mm, 3% / 5 when the threshold level was 5%, 10%, 20%, 70%, 90% mm, the average passing rate of γ≤1 exceeded 94.1%. The geometric distribution of the measured dose distribution and the calculated results showed good agreement in the corresponding plane. CONCLUSIONS: Both 3D detector arrays are characterized by their satisfactory results for TOMO IMRT program validation.