Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid.
Evaluation of tracking accuracy of the CyberKnife system using a webcam and printed calibrated grid.
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DOI：
10.1120/jacmp.v17i2.5914
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发表时间：
2016-03-08
影响因子：
2.1
通讯作者：
Ogawa K
中科院分区：
文献类型：
--
作者：
Sumida I;Shiomi H;Higashinaka N;Murashima Y;Miyamoto Y;Yamazaki H;Mabuchi N;Tsuda E;Ogawa K
射波刀同步系统的跟踪精度通常使用基于胶片的验证方法进行评价。我们已经评估了一个验证系统，使用网络摄像头和打印校准网格，以验证跟踪精度超过三个不同的运动模式。将带有打印校准网格和四个基准标记的盒子连接到运动体模上。一个目标标记位于网格的中心。盒子是用其他三个标记设置的。在三种条件下评估目标跟踪准确度：1）静止; 2）对于相同的4 s周期和相同幅度为15 mm的2、4、6和8 s的不同周期，具有不同幅度为5、10、15和20 mm的正弦运动;以及3）6名正常呼吸的人类志愿者的不规则呼吸模式。红外线标记被放置在志愿者的眼镜上，它们的轨迹被用来模拟目标的运动。所有测试均在头尾方向上进行一维运动。网络摄像头捕捉网格的运动，激光束被用来模拟射波刀的光束。跟踪误差被定义为网格中心与激光束之间的差异。与一个固定的目标，平均跟踪误差为0.4毫米。正弦运动，跟踪误差小于2毫米，任何振幅和呼吸周期。对于志愿者的呼吸模式，平均跟踪误差范围为0.78 - 1.67 mm。因此，准确的病变定位需要对每位患者进行单独的质量保证。PACS编号：87.55.D‐，87.55.km，87.55.Qr，87.56.Fc
Tracking accuracy for the CyberKnife's Synchrony system is commonly evaluated using a film‐based verification method. We have evaluated a verification system that uses a webcam and a printed calibrated grid to verify tracking accuracy over three different motion patterns. A box with an attached printed calibrated grid and four fiducial markers was attached to the motion phantom. A target marker was positioned at the grid's center. The box was set up using the other three markers. Target tracking accuracy was evaluated under three conditions: 1) stationary; 2) sinusoidal motion with different amplitudes of 5, 10, 15, and 20 mm for the same cycle of 4 s and different cycles of 2, 4, 6, and 8 s with the same amplitude of 15 mm; and 3) irregular breathing patterns in six human volunteers breathing normally. Infrared markers were placed on the volunteers’ abdomens, and their trajectories were used to simulate the target motion. All tests were performed with one‐dimensional motion in craniocaudal direction. The webcam captured the grid's motion and a laser beam was used to simulate the CyberKnife's beam. Tracking error was defined as the difference between the grid's center and the laser beam. With a stationary target, mean tracking error was measured at 0.4 mm. For sinusoidal motion, tracking error was less than 2 mm for any amplitude and breathing cycle. For the volunteers’ breathing patterns, the mean tracking error range was 0.78‐1.67 mm. Therefore, accurate lesion targeting requires individual quality assurance for each patient. PACS number(s): 87.55.D‐, 87.55.km, 87.55.Qr, 87.56.Fc
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影响因子：
3.8
作者：
Fayad, Hadi;Pan, Tinsu;Visvikis, Dimitris
通讯作者：
Visvikis, Dimitris
影响因子：
3.8
作者：
Lujan, AE;Larsen, EW;Ten Haken, RK
通讯作者：
Ten Haken, RK
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：
3.5
作者：
Ernst, F.;Duerichen, R.;Schweikard, A.
通讯作者：
Schweikard, A.
影响因子：
2.1
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
通讯作者：
Inoue T