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Proceedings Paper

Three-dimensional reconstruction of coronary stents in vivo based on motion compensated x-ray angiography
Author(s): Dirk Schäfer; Babak Movassaghi; Michael Grass; Gert Schoonenberg; Raoul Florent; Onno Wink; Andrew J. P. Klein; James Y. Chen; Joel Garcia; John C. Messenger; John D. Carroll M.D.
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Paper Abstract

The complete expansion of the stent during a percutaneous transluminal coronary angioplasty (PTCA) procedure is essential for treatment of a stenotic segment of a coronary artery. Inadequate expansion of the stent is a major predisposing factor to in-stent restenosis and acute thrombosis. Stents are positioned and deployed by fluoroscopic guidance. Although the current generation of stents are made of materials with some degree of radio-opacity to detect their location after deployment, proper stent expansion is hard to asses. In this work, we introduce a new method for the three-dimensional (3D) reconstruction of the coronary stents in-vivo utilizing two-dimensional projection images acquired during rotational angiography (RA). The acquisition protocol consist of a propeller rotation of the X-ray C-arm system of 180°, which ensures sufficient angular coverage for volume reconstruction. The angiographic projections were acquired at 30 frames per second resulting in 180 projections during a 7 second rotational run. The motion of the stent is estimated from the automatically tracked 2D coordinates of the markers on the balloon catheter. This information is used within a motion-compensated reconstruction algorithm. Therefore, projections from different cardiac phases and motion states can be used, resulting in improved signal-to-noise ratio of the stent. Results of 3D reconstructed coronary stents in vivo, with high spatial resolution are presented. The proposed method allows for a comprehensive and unique quantitative 3D assessment of stent expansion that rivals current X-ray and intravascular ultrasound techniques.

Paper Details

Date Published: 22 March 2007
PDF: 8 pages
Proc. SPIE 6509, Medical Imaging 2007: Visualization and Image-Guided Procedures, 65091M (22 March 2007); doi: 10.1117/12.706439
Show Author Affiliations
Dirk Schäfer, Philips Research Europe (Germany)
Babak Movassaghi, Philips Medical Systems North America (United States)
Michael Grass, Philips Research Europe (Germany)
Gert Schoonenberg, Philips Medical Systems (Netherlands)
Raoul Florent, Philips Medical Systems Research Paris (France)
Onno Wink, Philips Medical Systems (Netherlands)
Univ. of Colorado Health Sciences Ctr. (United States)
Andrew J. P. Klein, Univ. of Colorado Health Sciences Ctr. (United States)
James Y. Chen, Univ. of Colorado Health Sciences Ctr. (United States)
Joel Garcia, Univ. of Colorado Health Sciences Ctr. (United States)
John C. Messenger, Univ. of Colorado Health Sciences Ctr. (United States)
John D. Carroll M.D., Univ. of Colorado Health Sciences Ctr. (United States)

Published in SPIE Proceedings Vol. 6509:
Medical Imaging 2007: Visualization and Image-Guided Procedures
Kevin R. Cleary; Michael I. Miga, Editor(s)

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