| 周震,王贝,董婷婷,等.光学表面成像系统临床应用的验收测试[J].中华放射医学与防护杂志,2024,44(12):1013-1019.Zhou Zhen,Wang Bei,Dong Tingting,et al.Clinical acceptance tests of an optical surface imaging (OSI) system[J].Chin J Radiol Med Prot,2024,44(12):1013-1019 |
| 光学表面成像系统临床应用的验收测试 |
| Clinical acceptance tests of an optical surface imaging (OSI) system |
| 投稿时间：2024-05-09 |
| DOI：10.3760/cma.j.cn112271-20240509-00170 |
| 中文关键词: 光学表面成像 验收测试 门控系统 剂量学差异 |
| 英文关键词:Optical surface imaging Acceptance test Gating system Dosimetric difference |
| 基金项目:国家重点研发计划资助(2022YFC2404606);中央高水平医院临床科研业务费资助项目(2022-PUMCH-B-116) |
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| 中文摘要: |
| 目的 对光学表面成像(OSI)系统进行临床验收测试,保证其在临床应用的准确性和可靠性。方法 基于美国医学物理师协会(AAPM) TG147和AAPM TG302报告,使用模体对AlignRT系统各项性能指标进行临床测试,定量评估系统的整体运行精度。另选取13例患者放疗计划进行门控测试,表征AlignRT系统引导下门控递送的总体剂量学准确性。结果 AlignRT系统摄像单元的平均相对位置偏差为0.34和0.47 mm。通过模体校准,可以修正与辐射等中心的位置偏差。热漂移主要出现在升降和进出方向,为0.2和0.3 mm。环境光强差异导致的精度偏差约为0.04 mm;摄像单元被遮挡的主要偏差在左右方向,约为0.15 mm。平移方向定位精度的最大偏差为0.4 mm,治疗床旋转过程中主要偏差出现在旋转(YAW)方向,平均值为0.38°。系统监控偏差与锥形束CT(CBCT)配准偏差呈强相关关系,相关系数大于0.8。相较于非门控状态,门控启用时剂量分布的相对γ通过率均>99%。结论 AlignRT系统具备亚毫米的监控精度,满足临床治疗中患者位置验证和实时监控的需求。与加速器门控级联并未引入明显的剂量学偏差,临床计划可在门控模式下可靠执行。 |
| 英文摘要: |
| Objective To perform clinical acceptance tests of an optical surface imaging (OSI) system to ensure its accuracy and reliability in clinical applications. Methods Based on the AAPM TG147 and AAPM TG302 reports, clinical tests were conducted for various performance indicators of the AlignRT system using phantoms, followed by the quantitative assessment of the system's overall operational accuracy. Additionally, gating tests were performed on the radiotherapy plans of 13 patients to characterize the overall dosimetric accuracy of gated delivery under the guidance of the AlignRT system. Results The camera units of the AlignRT system exhibited average relative positional deviations of 0.34 and 0.47 mm, respectively. The positional deviations from the radiation isocenter can be corrected through calibration with a phantom. Thermal drift primarily occurred in the vertical (y) and longitudinal (z) directions, measuring 0.2 and 0.3 mm, respectively. The accuracy deviation caused by differences in ambient light intensity was approximately 0.04 mm. When a camera unit was obstructed, the primary deviation was found in the lateral (x) direction, about 0.15 mm. In the translational direction, the maximum deviation in positioning accuracy was 0.4mm. During couch rotation, primary deviation occurred in the direction of YAW rotation, averaging 0.38°. There was a strong correlation between system monitoring deviations and cone-beam CT (CBCT) registration deviations, with correlation coefficients exceeding 0.8. In the case of gated delivery, the relative gamma pass rate for dose distribution exceeded 99% compared to the non-gated delivery. Conclusions The AlignRT system provides sub-millimeter monitoring accuracy, meeting the demand for patient position verification and real-time monitoring in clinical treatment. Given that the introduction of a linear accelerator into gating did not result in significant dosimetric deviations, clinical plans can be performed reliably using gated treatment. |
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