Technical note: Analysis of brachytherapy source movement by high-speed camera
Technical note: Analysis of brachytherapy source movement by high-speed camera
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DOI：
10.1002/mp.15601
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发表时间：
2022-05-13
期刊：
影响因子：
3.8
通讯作者：
Igaki, Hiroshi
中科院分区：
文献类型：
--
作者：
Okamoto, Hiroyuki;Iijima, Kotaro;Igaki, Hiroshi
目的：利用高速摄像机评价近距离放射治疗源的位置、驻留时间和通过剂量，以评估近距离放射治疗源移动的准确性。方法在远程后装系统中，使用高速摄像机记录Ir-192源相对于定制定位夹具中的标尺的源位置。分析的帧可用于评估停留位置和时间。治疗计划的多个停留时间等于0.1、0.5、1.0和2.0 s，步长为2.5 mm和5 mm。以146帧/秒的速率获取图像。对采集的图像进行处理，以使用模板图像和每帧之间的相关性自动跟踪实际源。近距离放射治疗剂量计算公式（AAPM TG 43-U1）应用于每个帧，以评估传输剂量对总剂量的贡献。结果在治疗计划中，对于等于0.1、0.5、1.0和2.0 s的驻留时间，测量的源位置与标称源位置的差异约为
Purpose To assess the accuracy of the movement of a brachytherapy source using a high-speed camera for evaluating source position, dwell time, and transit dose. Methods A high-speed camera was used to record the source position of an Ir-192 source relative to a ruler within a custom positioning jig in a remote afterloading system. The analyzed frames can be used to assess dwell positions and times. Treatment plans had multiple dwell times equal to 0.1, 0.5, 1.0, and 2.0 s in 2.5- and 5-mm step sizes. Images were acquired at a rate of 146 frames/s. Acquired images were processed to automatically track the actual source using the correlation between a template image and each frame. The brachytherapy dose calculation formalism (AAPM TG43-U1) was applied to each frame to evaluate the transit dose contribution to the total dose. Results The differences in measured source positions from the nominal for dwell times equal to 0.1, 0.5, 1.0, and 2.0 s in treatment plans were approximately