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Proceedings Paper

A blob-based tomographic reconstruction of 3D coronary trees from rotational x-ray angiography
Author(s): Jian Zhou; Alexandre Bousse; Guanyu Yang; Jean-Jacques Bellanger; Limin Luo; Christine Toumoulin; Jean-Louis Coatrieux
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Paper Abstract

A method is proposed for a 3D reconstruction of coronary networks from rotational projections that departs from motion-compensated approaches. It deals with multiple views extracted from a time-stamped image sequence through ECG gating. This statistics-based vessel reconstruction method relies on a new imaging model by considering both the effect of background tissues and the image representation using spherically-symmetric basis functions, also called 'blobs'. These blobs have a closed analytical expression for the X-ray transform, which makes easier to compute a cone-beam projection than a voxel-based description. A Bayesian maximum a posteriori (MAP) estimation is used with a Poisson distributed projection data instead of the Gaussian approximation often used in tomography reconstruction. A heavy-tailed distribution is proposed as image prior to take into account the sparse nature of the object of interest. The optimization is performed by an expectation-maximization like (EM) block iterative algorithm which offers a fast convergence and a sound introduction of the non-negativity constraint for vessel attenuation coefficients. Simulations are performed using a model of coronary tree extracted from multidetector CT scanner and a performance study is conducted. They point out that, even with severe angular undersampling (6 projections over 110 degrees for instance) and without introducing a prior model of the object, significant results can be achieved.

Paper Details

Date Published: 18 March 2008
PDF: 12 pages
Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69132N (18 March 2008); doi: 10.1117/12.769478
Show Author Affiliations
Jian Zhou, Southeast Univ. (China)
INSERM (France)
Univ. de Rennes 1 (France)
Alexandre Bousse, Southeast Univ. (China)
INSERM (France)
Univ. de Rennes 1 (France)
Guanyu Yang, Southeast Univ. (China)
INSERM (France)
Univ. de Rennes 1 (France)
Jean-Jacques Bellanger, INSERM (France)
Univ. de Rennes 1 (France)
Ctr. de Recherche en Information Biomédicale Sino-francais (France)
Limin Luo, Southeast Univ. (China)
Ctr. de Recherche en Information Biomédicale Sino-francais (France)
Christine Toumoulin, INSERM (France)
Univ. de Rennes 1 (France)
Ctr. de Recherche en Information Biomédicale Sino-francais (France)
Jean-Louis Coatrieux, INSERM (France)
Univ. de Rennes 1 (France)
Ctr. de Recherche en Information Biomédicale Sino-francais (France)


Published in SPIE Proceedings Vol. 6913:
Medical Imaging 2008: Physics of Medical Imaging
Jiang Hsieh; Ehsan Samei, Editor(s)

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