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Proceedings Paper

Stereovision-updated image guidance in multi-level open spine surgery: short vs. long exposure
Author(s): Xiaoyao Fan; Maxwell S. Durtschi; Chen Li; Linton T. Evans; Songbai Ji; Yunliang Cai; Sohail K. Mirza; Keith D. Paulsen
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Paper Abstract

In open spine surgery, the accuracy of image guidance is compromised by alignment change between supine preoperative CT images (pCT) and prone intraoperative positioning. We have developed a level-wise registration framework to compensate for the intervertebral motion by updating pCT to match with intraoperative stereovision (iSV) data of the exposed spine. In this study, we compared performance of the iSV image updating system in different lengths of exposure using retrospective data from one cadaver pig specimen. Specifically, L1 to L6 were exposed and 3 metallic mini-screws were implanted on each level as “ground truth” locations. The spine was positioned supine to acquire pCT, and then positioned prone to acquire iSV using a hand-held iSV device. One image pair of iSV was acquired from each exposed vertebra. Three exposure lengths were evaluated by selecting data from corresponding levels to compare performance: 6 levels, 4 levels, and 3 levels. Accuracy of iSV updating was assessed through point-to-point registration error (ppRE) using mini-screw locations, and the average accuracy was 1.26±0.77 mm, 1.54±0.62 mm, and 1.38±0.44 mm, for the three exposure lengths, respectively. The time cost was ~10-15 min and similar in all three exposure sizes. Results indicate that performance of iSV image updating was similar in different lengths of exposure, and the accuracy was within clinically acceptable range (2 mm).

Paper Details

Date Published: 16 March 2020
PDF: 7 pages
Proc. SPIE 11315, Medical Imaging 2020: Image-Guided Procedures, Robotic Interventions, and Modeling, 1131529 (16 March 2020); doi: 10.1117/12.2549646
Show Author Affiliations
Xiaoyao Fan, Dartmouth College (United States)
Maxwell S. Durtschi, Dartmouth College (United States)
Chen Li, Dartmouth College (United States)
Linton T. Evans, Dartmouth College (United States)
Dartmouth-Hitchcock Medical Ctr. (United States)
Songbai Ji, Dartmouth College (United States)
Worcester Institute of Polytechnic (United States)
Yunliang Cai, Worcester Polytechnic Institute (United States)
Sohail K. Mirza, Dartmouth College (United States)
PEERClinic for Back Pain and Spine Surgery (United States)
Keith D. Paulsen, Dartmouth College (United States)
Dartmouth-Hitchcock Medical Ctr. (United States)

Published in SPIE Proceedings Vol. 11315:
Medical Imaging 2020: Image-Guided Procedures, Robotic Interventions, and Modeling
Baowei Fei; Cristian A. Linte, Editor(s)

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