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Gradient-Based 2-D/3-D Rigid Registration of Flouroscopic X-Ray to CT.

Authors :
Livyatan, Harel
Yaniv, Ziv
Joskowicz, Leo
Source :
IEEE Transactions on Medical Imaging. Nov2003, Vol. 22 Issue 11, p1395-1406. 12p.
Publication Year :
2003

Abstract

We present a gradient-based method for rigid registration of a patient preoperative computed tomography (CT) to its intraoperative situation with a few fluoroscopic X-ray images obtained with a tracked C-arm. The method is noninvasive, anatomybased, requires simple user interaction, and includes validation. It is generic and easily customizable for a variety of routine clinical uses in orthopaedic surgery. Gradient-based registration consists of three steps: 1) initial pose estimation; 2) coarse geometry-based registration on bone contours, and; 3) fine gradient projection registration (GPR) on edge pixels. It optimizes speed, accuracy, and robustness. Its novelty resides in using volume gradients to eliminate outliers and foreign objects in the fluoroscopic X-ray images, in speeding up computation, and in achieving higher accuracy. It overcomes the drawbacks of intensity-based methods, which are slow and have a limited convergence range, and of geometry-based methods, which depend on the image segmentation quality. Our simulated, in vitro, and cadaver experiments on a human pelvis CT, dry vertebra, dry femur, fresh lamb hip, and human pelvis under realistic conditions show a mean 0.5-1.7 mm (0.5-2.6 mm maximum) target registration accuracy. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02780062
Volume :
22
Issue :
11
Database :
Academic Search Index
Journal :
IEEE Transactions on Medical Imaging
Publication Type :
Academic Journal
Accession number :
11421773
Full Text :
https://doi.org/10.1109/TMI.2003.819288