Comparative in vitro study of contact- and image-based rigid registration for computer-aided surgery

Ofri Sadowsky, Ziv Yaniv, Leo Joskowicz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We present an in vitro study of rigid registration methods for computer-aided surgery. The goals of the study were to obtain accuracy measures empirically under optimal laboratory conditions, and to identify the weak links in the registration chain. Specifically, we investigated two common registration methods (contact-based registration and image-based landmark registration) and established a framework for comparing the accuracy of both methods. The phantoms, protocols, and algorithms for tool tip calibration, contact-based registration with an optical tracker, fluoroscopic X-ray camera calibration, and fluoroscopic X-ray image-based landmark registration are described. Average accuracies of 0.5 mm (1.5 mm maximum) and 2.75 mm (3.4 mm maximum) were found for contact-based and image-based landmark registration, respectively. Based on these findings, the camera calibration was identified as being the main source of error in image-based landmark registration. Protocol improvements and algorithmic refinements to improve the accuracy of image-based landmark registration are proposed.

Original languageAmerican English
Pages (from-to)223-236
Number of pages14
JournalComputer Aided Surgery
Issue number4
StatePublished - 2002

Bibliographical note

Funding Information:
This research was supported in part by a grant from the Israel Ministry of Industry and Trade for the IZMEL Consortium on Image-Guided Therapy. We thank Neil Glossop from Traxtal Technologies for his advise and support.


  • Accuracy measurements
  • Contact-based registration
  • Fluoroscopy
  • Image-based registration
  • Registration
  • Tracking


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