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基于双管压 CT 图像获取带电粒子相对阻止本领的 方法研究

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Study on the method of acquiring the relative stopping power of charged particles based on dualtube voltage CT images

摘要: 质子重离子放射治疗中,通过CT扫描获取患者每个体素点的相对阻止本领,是治疗计划系统精确计算体内剂量分布的关键。本研究通过设置常规CT不同管电压对组织等效模体进行两次CT扫描,通过两组图像的CT值计算出模体的相对电子密度和有效原子序数,进而计算出模体的相对阻止本领。研究结果表明,使用双CT值预测的组织等效模体的相对阻止本领结果优于常规基于单组图像获得的结果。因此,本文方法对进一步提高质子重离子放疗治疗计划剂量计算的准确性具有重要作用。
Abstract: In proton and heavy ion radiotherapy, the relative stopping power of each voxel point obtained by CT scan for patient is the key to accurately calculate the dose distribution in the body using treatment planning system. In this study, a tissue equivalent phantom was scanned twice by setting different tube voltages for a conventional CT scanner. The relative electron density and effective atomic number of the phantom were calculated by the CT values derived from the two-set images, and then the relative stopping power of the phantom was calculated. The results showed that the relative stopping power of the tissue equivalent phantom acquired with the two-set CT values was better than that based on the conventional single set of CT images. Thus, the method established in this study might play an important role in further improving the dose calculation accuracy in the treatment planning of proton and heavy ion radiotherapy.

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[V2] 2024-01-04 10:01:31 ChinaXiv:202311.00131V2 下载全文
[V1] 2023-11-09 10:48:54 ChinaXiv:202311.00131v1 查看此版本 下载全文
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