How to achieve fast, accurate, and robust rigid registration between
fluoroscopic X-ray and CT images

L. Joskowicz and D. Knaan

School of Engineering and Computer Science, The Hebrew Univ. of Jerusalem,
Israel.

Abstract: This paper presents algorithmic refinements to our method for
rigid registration between preoperative CT and intraoperative X-rays and
studies the influence of various set-ups and factors on the methods'
performance.  Experimental results on five different anatomical structures
show that the new three-phase algorithm achieves a mean accuracy of 0.7mm
(max=1.1mm) 95\% of the time with an initial pose offset of up to 60mm in
80 secs average with three X-ray images and CT slice spacing of 2.4mm and
handles image clutter well.

Keywords: 2D/3D rigid registration, intensity-based registration

Published in: Proc. of the 18th Int. Congress on Computer-Assisted
Radiology and Surgery, CARS'2004, H.U. Lemke et. al. editors, International
Congress Series Elsevier 2004, pp 147--152.