Calibration of a surgical microscope with automated zoom lenses using an active optical tracker

García, Jaime; Thoranaghatte, Ramesh; Marti, Gaetan; Zheng, Guoyan; Caversaccio, Marco; González Ballester, Miguel A (2008). Calibration of a surgical microscope with automated zoom lenses using an active optical tracker. International journal of medical robotics and computer assisted surgery, 4(1), pp. 87-93. Chichester: Wiley 10.1002/rcs.180

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BACKGROUND: In this paper, we present a new method for the calibration of a microscope and its registration using an active optical tracker. METHODS: Practically, both operations are done simultaneously by moving an active optical marker within the field of view of the two devices. The IR LEDs composing the marker are first segmented from the microscope images. By knowing their corresponding three-dimensional (3D) position in the optical tracker reference system, it is possible to find the transformation matrix between the referential of the two devices. Registration and calibration parameters can be extracted directly from that transformation. In addition, since the zoom and focus can be modified by the surgeon during the operation, we propose a spline based method to update the camera model to the new setup. RESULTS: The proposed technique is currently being used in an augmented reality system for image-guided surgery in the fields of ear, nose and throat (ENT) and craniomaxillofacial surgeries. CONCLUSIONS: The results have proved to be accurate and the technique is a fast, dynamic and reliable way to calibrate and register the two devices in an OR environment.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB [discontinued] 04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Ear, Nose and Throat Disorders (ENT)
UniBE Contributor:	Garcia, Jaime, Thoranaghatte, Uravakonda Ramesh, Zheng, Guoyan, Caversaccio, Marco, Gonzalez Ballester, Miguel Angel
ISSN:	1478-5951
ISBN:	18275035
Publisher:	Wiley
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:04
Last Modified:	05 Dec 2022 14:19
Publisher DOI:	10.1002/rcs.180
PubMed ID:	18275035
Web of Science ID:	000254357900012
URI:	https://boris.unibe.ch/id/eprint/27737 (FactScience: 110666)