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Proceedings Paper

C-arm calibration: is it really necessary?
Author(s): Ameet Kumar Jain; Michael An; Nicha Chitphakdithai; Gouthami Chintalapani; Gabor Fichtinger
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Paper 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 C-arm calibration is really necessary. Using our theoretical framework, we derive upper bounds on the effect of mis-calibration on various algorithms like C-arm tracking, 3D reconstruction and surgical guidance in virtual fluoroscopy - some of the most common techniques in intra-operative fluoroscopic guidance. To derive bounds as a function of mis-calibration, we model the error using an transform. This is fairly intuitive, since small amounts of mis-calibration result in predictably linear transformation of the reconstruction space. Experiments indicate the validity of this approximation even for 50 mm mis-calibrations.

Paper Details

Date Published: 22 March 2007
PDF: 16 pages
Proc. SPIE 6509, Medical Imaging 2007: Visualization and Image-Guided Procedures, 65092U (22 March 2007); doi: 10.1117/12.712301
Show Author Affiliations
Ameet Kumar Jain, Johns Hopkins Univ. (United States)
Michael An, Johns Hopkins Univ. (United States)
Nicha Chitphakdithai, Johns Hopkins Univ. (United States)
Gouthami Chintalapani, Johns Hopkins Univ. (United States)
Gabor Fichtinger, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 6509:
Medical Imaging 2007: Visualization and Image-Guided Procedures
Kevin R. Cleary; Michael I. Miga, Editor(s)

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