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利用MCNPX模拟计算了医用重离子加速器示范装置(HIMM)上提供的碳离子束在水中的深度剂量分布,并与在HIMM装置上实验测量得到相应能量碳离子束的深度剂量分布进行比较,发现模拟结果与实验测量结果相符合,验证了MCNPX用于重离子输运模拟的准确性。开发了基于射线追踪技术的解析传输接口软件RTIM和基于PYDICOM的DCVM软件,将存储在DICOM文件中的补偿器信息和患者CT图像信息转化为MCNPX可识别的构造实体表示法信息,从而实现了在MCNPX中对重离子TPS产生的补偿器和患者CT图像建模。这些研究为利用MCNPX模拟HIMM被动式束流配送系统构形后的重离子束流在患者体内的剂量分布奠定了基础。
Using MCNPX simulation, the depth dose distribution of carbon ion beam in medical heavy ion accelerator model device (HIMM) was calculated and compared with the depth dose distribution of carbon ion beam experimentally measured in HIMM device. It was found that the simulation The results are in good agreement with the experimental results and verify the accuracy of MCNPX for heavy ion transport simulation. RTIM and PYDICOM-based DCVM software are developed based on ray tracing technology, compensator information and patient CT image information stored in DICOM file are converted into MCNPX identifiable structure representation information, so as to achieve Compensators and patient CT images generated by heavy ion TPS were modeled in MCNPX. These studies lay the foundation for the use of MCNPX to simulate the dose distribution of heavy ion beams in patients after HIMM passive beam delivery system configuration.