Robust Automatic C-Arm Calibration for Fluoroscopy-Based Navigation: A Practical Approach
MICCAI '02 Proceedings of the 5th International Conference on Medical Image Computing and Computer-Assisted Intervention-Part II
C-arm tracking by intensity-based registration of a fiducial in prostate brachytherapy
IPCAI'10 Proceedings of the First international conference on Information processing in computer-assisted interventions
C-arm pose estimation in prostate brachytherapy by registration to ultrasound
MICCAI'10 Proceedings of the 13th international conference on Medical image computing and computer-assisted intervention: Part III
C-arm tracking and reconstruction without an external tracker
MICCAI'06 Proceedings of the 9th international conference on Medical Image Computing and Computer-Assisted Intervention - Volume Part I
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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 50 mm still allows for tracking with an accuracy of 0.5 mm in translation and 0.65o in rotation, and such mis-calibration does not impose any additional error on the reconstruction of small objects.