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Proceedings Paper

Four-dimensional cardiac reconstruction from rotational x-ray sequences: first results for 4D coronary angiography
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Paper Abstract

The tomographic reconstruction of the beating heart requires dedicated methods. One possibility is gated reconstruction, where only data corresponding to a certain motion state are incorporated. Another one is motioncompensated reconstruction with a pre-computed motion vector field, which requires a preceding estimation of the motion. Here, results of a new approach are presented: simultaneous reconstruction of a three-dimensional object and its motion over time, yielding a fully four-dimensional representation. The object motion is modeled by a time-dependent elastic transformation. The reconstruction is carried out with an iterative gradient-descent algorithm which simultaneously optimizes the three-dimensional image and the motion parameters. The method was tested on a simulated rotational X-ray acquisition of a dynamic coronary artery phantom, acquired on a C-arm system with a slowly rotating C-arm. Accurate reconstruction of both absorption coefficient and motion could be achieved. First results from experiments on clinical rotational X-ray coronary angiography data are shown. The resulting reconstructions enable the analysis of both static properties, such as vessel geometry and cross-sectional areas, and dynamic properties, like magnitude, speed, and synchrony of motion during the cardiac cycle.

Paper Details

Date Published: 10 March 2009
PDF: 11 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72580B (10 March 2009); doi: 10.1117/12.811104
Show Author Affiliations
Eberhard Hansis, Philips Research Europe (Germany)
Univ. of Karlsruhe (Germany)
Hermann Schomberg, Philips Research Europe (Germany)
Klaus Erhard, Philips Research Europe (Germany)
Olaf Dössel, Univ. of Karlsruhe (Germany)
Michael Grass, Philips Research Europe (Germany)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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