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Proceedings Paper

Surgical screw segmentation for mobile C-arm CT devices
Author(s): Joseph Görres; Michael Brehler; Jochen Franke; Ivo Wolf; Sven Y. Vetter; Paul A. Grützner; Hans-Peter Meinzer; Diana Nabers
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Paper Abstract

Calcaneal fractures are commonly treated by open reduction and internal fixation. An anatomical reconstruction of involved joints is mandatory to prevent cartilage damage and premature arthritis. In order to avoid intraarticular screw placements, the use of mobile C-arm CT devices is required. However, for analyzing the screw placement in detail, a time-consuming human-computer interaction is necessary to navigate through 3D images and therefore to view a single screw in detail. Established interaction procedures of repeatedly positioning and rotating sectional planes are inconvenient and impede the intraoperative assessment of the screw positioning. To simplify the interaction with 3D images, we propose an automatic screw segmentation that allows for an immediate selection of relevant sectional planes. Our algorithm consists of three major steps. At first, cylindrical characteristics are determined from local gradient structures with the help of RANSAC. In a second step, a DBScan clustering algorithm is applied to group similar cylinder characteristics. Each detected cluster represents a screw, whose determined location is then refined by a cylinder-to-image registration in a third step. Our evaluation with 309 screws in 50 images shows robust and precise results. The algorithm detected 98% (303) of the screws correctly. Thirteen clusters led to falsely identified screws. The mean distance error for the screw tip was 0.8 ± 0.8 mm and for the screw head 1.2 ± 1 mm. The mean orientation error was 1.4 ± 1.2 degrees.

Paper Details

Date Published: 12 March 2014
PDF: 6 pages
Proc. SPIE 9036, Medical Imaging 2014: Image-Guided Procedures, Robotic Interventions, and Modeling, 90360M (12 March 2014); doi: 10.1117/12.2043030
Show Author Affiliations
Joseph Görres, German Cancer Research Ctr. (DFKZ) (Germany)
Michael Brehler, German Cancer Research Ctr. (DFKZ) (Germany)
Jochen Franke, BG Trauma Ctr. (Germany)
Ivo Wolf, Mannheim Univ. of Applied Sciences (Germany)
Sven Y. Vetter, BG Trauma Ctr. (Germany)
Paul A. Grützner, BG Trauma Ctr. (Germany)
Hans-Peter Meinzer, German Cancer Research Ctr. (DFKZ) (Germany)
Diana Nabers, German Cancer Research Ctr. (DFKZ) (Germany)

Published in SPIE Proceedings Vol. 9036:
Medical Imaging 2014: Image-Guided Procedures, Robotic Interventions, and Modeling
Ziv R. Yaniv; David R. Holmes, Editor(s)

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