Development of system using beam's eye view images to measure respiratory motion tracking errors in image-guided robotic radiosurgery system.
Development of system using beam's eye view images to measure respiratory motion tracking errors in image-guided robotic radiosurgery system.
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DOI：
10.1120/jacmp.v16i1.5049
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发表时间：
2015-01-08
影响因子：
2.1
通讯作者：
Inoue T
中科院分区：
文献类型：
--
作者：
Inoue M;Shiomi H;Iwata H;Taguchi J;Okawa K;Kikuchi C;Inada K;Iwabuchi M;Murai T;Koike I;Tatewaki K;Ohta S;Inoue T
CyberKnife同步呼吸跟踪系统(SRTS)的准确性被认为取决于患者，因为SRTS依赖于内部肿瘤位置(ITP)和外部标记位置(EMP)之间的个体相关性，以及补偿调整直线加速器(LINAC)位置所产生的延迟的预测方法。我们的目标是开发一种系统，通过使用射束的眼视图(BEV)图像来获得SRTS跟踪误差的预处理统计测量，从而能够预测患者的特定精度。ITP和EMP的呼吸运动数据来自23名患者的电影磁共振图像。动态运动体模被用来再现ITP和EMP运动。CyberKnife随后与SRT一起操作，在直线加速器的头部安装了一个CCD摄像机。在直线加速器跟踪球目标的过程中，记录了来自CCD摄像机的BEV图像。跟踪误差是使用内部软件在15赫兹测量的。为了评估使用MR图像检测位置的精度，将试管的位置(从MR图像确定)与它们的实际位置进行了比较。为了评估球位置检测的精确度，将从Bev图像测量的球位置与使用游标卡尺测量的值进行了比较。通过确定概率大于95%的跟踪误差来评估SRTS的准确性(Ep95)。肿瘤位置的检测精度(由电影MR图像确定)为。使用BEV图像时，跟踪误差的检测精度为。这两个检测精度来自我们的测量系统，而不是从SRTS获得的。EP95中位数为1.5(1.0~3.5)mm。最小和最大EP95之间的差值为2.5 mm，表明这为评估患者特定SRTS的准确性提供了更好的手段。根据预测的患者特定SRTS的准确性，可以将适当的边际添加到临床靶区。PAC编号：87.53。Ly
The accuracy of the CyberKnife Synchrony Respiratory Tracking System (SRTS) is considered to be patient‐dependent because the SRTS relies on an individual correlation between the internal tumor position (ITP) and the external marker position (EMP), as well as a prediction method to compensate for the delay incurred to adjust the position of the linear accelerator (linac). We aimed to develop a system for obtaining pretreatment statistical measurements of the SRTS tracking error by using beam's eye view (BEV) images, to enable the prediction of the patient‐specific accuracy. The respiratory motion data for the ITP and the EMP were derived from cine MR images obtained from 23 patients. The dynamic motion phantom was used to reproduce both the ITP and EMP motions. The CyberKnife was subsequently operated with the SRTS, with a CCD camera mounted on the head of the linac. BEV images from the CCD camera were recorded during the tracking of a ball target by the linac. The tracking error was measured at 15 Hz using in‐house software. To assess the precision of the position detection using an MR image, the positions of test tubes (determined from MR images) were compared with their actual positions. To assess the precision of the position detection of the ball, ball positions measured from BEV images were compared with values measured using a Vernier caliper. The SRTS accuracy was evaluated by determining the tracking error that could be identified with a probability of more than 95% (Ep95). The detection precision of the tumor position (determined from cine MR images) was . The detection precision of the tracking error when using the BEV images was . These two detection precisions were derived from our measurement system and were not obtained from the SRTS. The median of Ep95 was found to be 1.5 (range, 1.0–3.5) mm. The difference between the minimum and maximum Ep95 was 2.5 mm, indicating that this provides a better means of evaluating patient‐specific SRTS accuracy. A suitable margin, based on the predicted patient‐specific SRTS accuracy, can be added to the clinical target volume. PACS number: 87.53.Ly
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影响因子：
5.7
作者：
van Zyp, Noelle C. van der Voort;Prevost, Jean-Briac;Nuyttens, Joost J.
通讯作者：
Nuyttens, Joost J.
影响因子：
4.8
作者：
Cheng, Y;Main, W;Wang, MY
通讯作者：
Wang, MY
影响因子：
1.7
作者：
Gerszten, PC;Ozhasoglu, C;Welch, WC
通讯作者：
Welch, WC
影响因子：
3.8
作者：
Pepin, Eric W.;Wu, Huanmei;Lord, Bryce
通讯作者：
Lord, Bryce
影响因子：
3.8
作者：
Seppenwoolde, Yvette;Berbeco, Ross I.;Heijmen, Ben
通讯作者：
Heijmen, Ben