| 张杰,罗春丽,刘楠,等.Flexitron后装机的临床调试[J].中华放射医学与防护杂志,2023,43(11):893-899.Zhang Jie,Luo Chunli,Liu Nan,et al.Clinical commissioning of the Flexitron afterloader[J].Chin J Radiol Med Prot,2023,43(11):893-899 |
| Flexitron后装机的临床调试 |
| Clinical commissioning of the Flexitron afterloader |
| 投稿时间：2023-04-28 |
| DOI：10.3760/cma.j.cn112271-20230428-00133 |
| 中文关键词: Flexitron后装机 临床调试 近距离治疗 |
| 英文关键词:Flexitron afterloader Clinical commissioning Brachytherapy |
| 基金项目:中央高水平医院临床科研项目(2022-PUMCH-B-052);中央高水平医院临床科研青年培优计划项目(2022-PUMCH-A-101) |
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| 中文摘要: |
| 目的 为满足国家标准和临床需求,对Flexitron后装机的硬件和软件制定临床调试流程、项目内容和测试方法,并建立相关的质量控制规程。方法 临床调试分为硬件、治疗计划系统(TPS)和端对端(ETE)的全流程测试。采用源位置检测标尺测量放射源的到位精度;通过秒表计时、电离室测量、视频分析3种方法检测驻留时间的精度和线性;使用高精度尺测试模拟尺、连接管、源位置检测标尺等测量工具的精度;使用胶片校准标记丝和施源器;使用静电计和井型电离室校准放射源活度。通过实物图像对TPS的显示、重建精度进行评价。采用自制模体完成扫描、计划和剂量测量进行ETE测试。结果 调试项目中的精度检测结果均在可接受的限值之内,源活度测量结果偏差为0.21%,ETE点剂量测量偏差为2.32%,均满足临床使用要求。但精度检测项目中,核磁标记丝的标称和实测值存在2 mm差异,因此基于核磁影像采用标记丝进行管道重建时需要修正。结论 本研究通过总结Flexitron后装机的临床调试经验,制定了后装机、计划系统各项目的质量控制方法及结果的基线水平,为后装机投入临床使用前的调试工作提供了参考。 |
| 英文摘要: |
| Objective To formulate clinical commissioning procedures, items, and testing method for Flexitron afterloader hardware and software and establish relevant quality control procedures in order to meet national standards and clinical requirements.Methods Clinical commissioning included hardware, treatment planning system (TPS), and end-to-end (ETE) full-process testing. The radioactive source positioning accuracy was measured using a source position check ruler. The accuracy and linearity of dwell time were evaluated using three method: stopwatch timing, ion chamber measurement, and video analysis. The accuracy of source position simulator, connecting tubes, source position check ruler, and other measuring tools was tested using a high-precision ruler. Films were used for calibration of marker lines and applicators. The electrometer and well chamber were used to calibrate the radioactive source activity. The display and reconstruction accuracies of the TPS were evaluated using physical image data. ETE testing was conducted using a custom-made phantom for scanning, planning, and dose measurement.Results The accuracy testing result of the commissioning items were within acceptable limits. The deviation in source activity measurements was 0.21%, and the ETE point dose measurement deviation was 2.32%, both of which met the clinical requirements. However, there was a 2 mm difference between the nominal and measured values of the magnetic resonance marker line in the accuracy testing items. Therefore, adjustments were required when using marker line for catheter reconstruction based on magnetic resonance images.Conclusions By summarizing the clinical commissioning experience of the Flexitron afterloader, this study has developed quality control method and baseline levels of result of afterloader and TPS items, which provides a reference for the commissioning before clinical use. |
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