C-arm calibration--is it really necessary?
C-arm calibration--is it really necessary?
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C型臂校准——真的有必要吗？
DOI：
10.1007/11566465_79
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Fichtinger,Gabor
中科院分区：
文献类型：
--
作者：
Jain,Ameet;Kon,Ryan;Zhou,Yu;Fichtinger,Gabor
c臂透视被建模为透视投影，其参数通过校准程序估计。人们普遍认为，精确的程序内校准是准确定量c臂透视指导的先决条件。然而，校准大大增加了系统的复杂性，这是临床实践的主要障碍。我们通过质疑精确的程序内校准是真正必要的假设来挑战现状。我们推导了三维测量对误校准灵敏度的理论界限。实验结果证实了这一理论，在焦斑上误差50mm仍然可以实现0.5mm平移和0.65°旋转的跟踪精度，并且这种误差不会对小物体的重建造成任何额外的误差。
C-arm fluoroscopy is modelled as a perspective projection, the parameters of which are estimated through a calibration procedure. It has been universally accepted that precise intra-procedural calibration is a prerequisite for accurate quantitative C-arm fluoroscopy guidance. Calibration, however, significantly adds to system complexity, which is a major impediment to clinical practice. We challenge the status quo by questioning the assumption that precise intra-procedural calibration is really necessary. We derived theoretical bounds for the sensitivity of 3D measurements to mis-calibration. Experimental results corroborated the theory in that mis-calibration in the focal spot by as much as 50mmstill allows for tracking with an accuracy of 0.5mmin translation and 0.65oin rotation, and such mis-calibration does not impose any additional error on the reconstruction of small objects.