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Proceedings Paper

Tissue localization using endoscopic laser projection for image-guided surgery
Author(s): David B. Kynor; Eric M. Friets; Darin A. Knaus; Jerry Bieszczad
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Paper Abstract

Image-guided surgery has led to more accurate lesion targeting and improved outcomes in neurosurgery. However, adaptation of the technology to other forms of surgery has been slow largely due to difficulties in determining the position of anatomic landmarks within the surgical field. The ability to localize anatomic landmarks and provide real-time tracking of tissue motion without placing additional demands on the surgeon will facilitate image-guided surgery in a variety of clinical disciplines. Even approximate localization of anatomic landmarks would benefit many forms of surgery. For example, liver surgeons could visualize intraoperative locations on preoperative CT or MR scans to assist them in navigating through the complex hepatic vascular network. This paper describes the initial stages of development of an endoscopic localization system for use during minimally-invasive, image-guided abdominal surgery. The system projects a scanned laser beam through a conventional endoscope. The projected laser spot is then observed using a second endoscope orientated obliquely to the projecting endoscope. Knowledge of the optical geometry of the endoscopes, along with their relative positions in space, allows determination of the three-dimensional coordinates of the illuminated point. The ultimate accuracy of the system is dependent on the geometric relationship between the endoscopes, the ability to accurately measure the position of each endoscope, and careful calibration of the optics used to project the laser beam. We report a system design intended to support automated operation, methods and initial results of measurement of target points, and preliminary data characterizing the performance of the system.

Paper Details

Date Published: 12 April 2005
PDF: 11 pages
Proc. SPIE 5744, Medical Imaging 2005: Visualization, Image-Guided Procedures, and Display, (12 April 2005); doi: 10.1117/12.594260
Show Author Affiliations
David B. Kynor, Creare Inc. (United States)
Eric M. Friets, Creare Inc. (United States)
Darin A. Knaus, Creare Inc. (United States)
Jerry Bieszczad, Creare Inc. (United States)


Published in SPIE Proceedings Vol. 5744:
Medical Imaging 2005: Visualization, Image-Guided Procedures, and Display
Robert L. Galloway; Kevin R. Cleary, Editor(s)

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