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目的 为改善放射治疗照射野验证的可视性、提高照射野验证的准确性和定量分析摆位误差 ,寻找一种切实可行的方法 ,为临床照射野验证工作提供有效的工具。方法 设计开发Win dows应用软件PIV ,在软件中提供了多种图像分析工具 (如图像增强、融合显示 )、半自动的照射野影像登记算法并可以报告定量的误差分析结果。结果 应用一组已知误差的参考图像与照射野图像对PIV软件的准确性进行评估 ,对于规则照射野使用软件进行验证其准确度平移可达 2 .5mm ,旋转可达1.5°,误差纠正后的照射野覆盖率≥ 96 .5 % ;对于不规则照射野验证时要注意将定量分析结果与融合显示的图像相结合 ,以发现由于照射野形状不同而产生的误报。结论 计算机辅助照射野验证技术可以有效提高照射野验证的可视性 ,半自动的照射野影像登记算法提高了定性验证的准确性 ,对于规则照射野可以给出精度较高的定量分析结果 ,是临床照射野验证的有力工具。
Objective To improve the veracity of radiotherapy field verification, improve the veracity of illumination field verification and quantitatively analyze the setup error, and find a practical method to provide an effective tool for the verification of clinical radiation field. Methods Win dows application software PIV was designed and developed. A variety of image analysis tools (such as image enhancement and fusion display) were provided in the software. Semi-automatic radiographic registration algorithm and quantitative error analysis results were reported. Results The accuracy of PIV software was evaluated by using a set of reference images and field images with known errors. The accuracy of PIV software was verified by software. The accuracy of translation was up to 2.5mm and the rotation was up to 1.5 °. After the error correction Of the radiation field coverage rate ≥ 96 .5%; verification of irregular radiation field should pay attention to the quantitative analysis results combined with fusion images to find the radiation field due to different shapes and false positives. Conclusion The computer-aided field validation technique can effectively improve the visibility of field validation. The semi-automatic field registration algorithm improves the accuracy of qualitative validation. For the field of regular field irradiation, a more accurate quantitative analysis result can be obtained. Irradiation field validation of a powerful tool.