C-arm calibration--is it really necessary?

Ameet Jain, Ryan Kon, Yun Zhou, Gabor Fichtinger

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

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 0.65 degrees in rotation, and such mis-calibration does not impose any additional error on the reconstruction of small objects.

Original languageEnglish (US)
Title of host publicationMedical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention
Pages639-646
Number of pages8
Volume8
EditionPt 1
StatePublished - 2005

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