A blob-based tomographic reconstruction of 3D coronary trees from rotational x-ray angiography
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.
Domains
Life Sciences [q-bio] Bioengineering Life Sciences [q-bio] Bioengineering Imaging Engineering Sciences [physics] Signal and Image processing Statistics [stat] Applications [stat.AP] Computer Science [cs] Medical Imaging Computer Science [cs] Modeling and Simulation Computer Science [cs] Graphics [cs.GR] Life Sciences [q-bio] Human health and pathology Cardiology and cardiovascular system Computer Science [cs] Signal and Image Processing
Origin : Files produced by the author(s)
Loading...