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Proceedings Paper

Quantification of skin motion over the liver using optical tracking
Author(s): David Thomas Boyd; Jonathan Tang; Filip Banovac; Daigo Tanaka; Sonja Dieterich; David Lindisch; Elliot Levy; Kevin Robert Cleary
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Paper Abstract

The purpose of this study was to quantify skin motion over the liver when patients are repositioned during image-guided interventions. Four human subjects with different body habitus lay supine on the interventional radiology table. The subjects held their arms up over their heads and down at their sides for 13 repositioning trials. Precise 3-D locations of the four skin fiducials permitted deformable skin motion to be quantified. For the first two occasions, the average skin motion was 1.00±0.82 mm in the arms-up position and 0.94±0.56 mm in the arms-down position, a small, but not statistically significant difference. Three out of the four subjects exhibited increased skin motion in the arms-up position, suggesting that patient-positioning technique during CT imaging may have an effect on the skin-motion component of registration error in image-guided interventions. The average skin motion was 0.65±0.39 mm for Subject 1 and 1.32±0.78 mm for Subject 2, a significant difference. Subjects 3 and 4 demonstrated a similar amount of skin motion. The subject with the largest body habitus demonstrated significantly less skin motion, an observation that is difficult to explain. The skin fiducial on the xiphoid process exhibited significantly less skin motion than the other fiducials, suggesting that certain anatomic locations could influence motion of the fiducial, and subsequently, the introduced error.

Paper Details

Date Published: 30 May 2003
PDF: 12 pages
Proc. SPIE 5029, Medical Imaging 2003: Visualization, Image-Guided Procedures, and Display, (30 May 2003); doi: 10.1117/12.479784
Show Author Affiliations
David Thomas Boyd, Georgetown Univ. (United States)
Georgetown Univ. Hospital (United States)
Jonathan Tang, Georgetown Univ. (United States)
Filip Banovac, Georgetown Univ. (United States)
Georgetown Univ. Hospital (United States)
Daigo Tanaka, Georgetown Univ. (United States)
Sonja Dieterich, Georgetown Univ. (United States)
Georgetown Univ. Hospital (United States)
David Lindisch, Georgetown Univ. (United States)
Georgetown Univ. Hospital (United States)
Elliot Levy, Georgetown Univ. (United States)
Georgetown Univ. Hospital (United States)
Kevin Robert Cleary, Georgetown Univ. (United States)


Published in SPIE Proceedings Vol. 5029:
Medical Imaging 2003: Visualization, Image-Guided Procedures, and Display
Robert L. Galloway, Editor(s)

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