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Proceedings Paper

3D ultrasound as sparse data for intraoperative brain deformation model
Author(s): Karen E. Lunn; Alex Hartov; Francis E. Kennedy; Michael I. Miga; David W. Roberts; Leah A. Platenik; Keith D. Paulsen
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Paper Abstract

During neurosurgery, intraoperative brain shift comprises the accuracy of image guided techniques. We are investigating the use of ultrasound as an inexpensive means of gaining 3D data on subsurface tissue deformation. Measured displacement of easily recognizable features can then be used to drive a computational model for a description of full volume deformation. Subsurface features identified in the ultrasound image plane are located in world space using a 3D optical tracking system mounted to the ultrasound scanhead. This tracking system is also co- registered with the model space derived from preoperative MR, allowing the ultrasound image plane to e reconstructed in MR space, and the corresponding oblique MR slice to be obtained. The ultrasound image tracker has been calibrated with a novel strategy involving multiple scans of N-shaped wires positioned at several depths. Mean calibration error is found to range from 0.43 mm to 0.76 mm in plane and 0.86 mm to 1.51 mm out of plane for the two ultrasound image scales calibrated. Improved ultrasound calibration and co- registration facilitates subsurface feature tracking as a first step in obtaining model constraints for intraoperative image compensation. Estimation of and compensation for brain shift through the low cost, efficient technology of ultrasound, combined with computational modeling is feasible and appears to be a promising means of improving intraoperative image guided techniques.

Paper Details

Date Published: 30 May 2001
PDF: 7 pages
Proc. SPIE 4325, Medical Imaging 2001: Ultrasonic Imaging and Signal Processing, (30 May 2001); doi: 10.1117/12.428208
Show Author Affiliations
Karen E. Lunn, Dartmouth College (United States)
Alex Hartov, Dartmouth College and Dartmouth Hitchcock Medical Ctr. and Norris Cotton Cancer Ctr. (United States)
Francis E. Kennedy, Dartmouth College (United States)
Michael I. Miga, Vanderbilt Univ. (United States)
David W. Roberts, Dartmouth Hitchcock Medical Ctr. and Norris Cotton Cancer Ctr. (United States)
Leah A. Platenik, Dartmouth College (United States)
Keith D. Paulsen, Dartmouth College, Dartmouth Hitchcock Medical Ctr., and Norris Cotton Cancer Ctr. (United States)

Published in SPIE Proceedings Vol. 4325:
Medical Imaging 2001: Ultrasonic Imaging and Signal Processing
Michael F. Insana; K. Kirk Shung, Editor(s)

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