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Proceedings Paper

Calibration-free coronary artery measurements for interventional device sizing using inverse geometry x-ray fluoroscopy: in vivo validation
Author(s): Michael T. Tomkowiak; Amish N. Raval; Michael S. Van Lysel; Tobias Funk; Michael A. Speidel
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Paper Abstract

Proper sizing of interventional devices to match coronary vessel dimensions improves procedural efficiency and therapeutic outcomes. We have developed a novel method using inverse geometry x-ray fluoroscopy to automatically determine vessel dimensions without the need for magnification calibration or optimal views. To validate this method in vivo, we compared results to intravascular ultrasound (IVUS) and coronary computed tomography angiography (CCTA) in a healthy porcine model. Coronary angiography was performed using Scanning-Beam Digital X-ray (SBDX), an inverse geometry fluoroscopy system that performs multiplane digital x-ray tomosynthesis in real time. From a single frame, 3D reconstruction of the arteries was performed by localizing the depth of vessel lumen edges. The 3D model was used to directly calculate length and to determine the best imaging plane to use for diameter measurements, where outof- plane blur was minimized and the known pixel spacing was used to obtain absolute vessel diameter. End-diastolic length and diameter measurements were compared to measurements from CCTA and IVUS, respectively. For vessel segment lengths measuring 6 mm to 73 mm by CCTA, the SBDX length error was -0.49 ± 1.76 mm (SBDX - CCTA, mean ± 1 SD). For vessel diameters measuring 2.1 mm to 3.6 mm by IVUS, the SBDX diameter error was 0.07 ± 0.27 mm (SBDX - minimum IVUS diameter, mean ± 1 SD). The in vivo agreement between SBDX-based vessel sizing and gold standard techniques supports the feasibility of calibration-free coronary vessel sizing using inverse geometry x-ray fluoroscopy.

Paper Details

Date Published: 19 March 2014
PDF: 14 pages
Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 90332H (19 March 2014); doi: 10.1117/12.2044078
Show Author Affiliations
Michael T. Tomkowiak, Univ. of Wisconsin-Madison (United States)
Amish N. Raval, Univ. of Wisconsin-Madison (United States)
Michael S. Van Lysel, Univ. of Wisconsin-Madison (United States)
Tobias Funk, Triple Ring Technologies, Inc. (United States)
Michael A. Speidel, Univ. of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 9033:
Medical Imaging 2014: Physics of Medical Imaging
Bruce R. Whiting; Christoph Hoeschen, Editor(s)

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