Murphy Martin J, Eidens Richard, Vertatschitsch Edward, Wright J Nelson
Department of Radiation Oncology, Virginia Commonwealth University, Richmond, VA 23298-0058, USA.
Int J Radiat Oncol Biol Phys. 2008 Sep 1;72(1):295-9. doi: 10.1016/j.ijrobp.2008.05.036.
To determine position and velocity-dependent effects in the overall accuracy of the Calypso Electromagnetic localization system, under conditions that emulate transponder motion during normal free breathing.
Three localization transponders were mounted on a remote-controlled turntable that could move the transponders along a circular trajectory at speeds up to 3 cm/s. A stationary calibration established the coordinates of multiple points on each transponder's circular path. Position measurements taken while the transponders were in motion at a constant speed were then compared with the stationary coordinates.
No statistically significant changes in the transponder positions in (x,y,z) were detected when the transponders were in motion.
The accuracy of the localization system is unaffected by transponder motion.
在模拟正常自由呼吸期间应答器运动的条件下，确定Calypso电磁定位系统整体精度中与位置和速度相关的影响。
三个定位应答器安装在一个遥控转盘上，该转盘可使应答器以高达3厘米/秒的速度沿圆形轨迹移动。通过静态校准确定每个应答器圆形路径上多个点的坐标。然后将应答器以恒定速度运动时进行的位置测量与静态坐标进行比较。
应答器运动时，在（x，y，z）方向上未检测到应答器位置有统计学上的显著变化。
定位系统的精度不受应答器运动的影响。
