title: Compressed sensing based 3D tomographic reconstruction for rotational angiography.
abstract: In this paper, we address three-dimensional tomographic reconstruction of rotational angiography acquisitions. In clinical routine, angular subsampling commonly occurs, due to the technical limitations of C-arm systems or possible improper injection. Standard methods such as filtered backprojection yield a reconstruction that is deteriorated by sampling artifacts, which potentially hampers medical interpretation. Recent developments of compressed sensing have demonstrated that it is possible to significantly improve reconstruction of subsampled datasets by generating sparse approximations through l1-penalized minimization. Based on these results, we present an extension of the iterative filtered backprojection that includes a sparsity constraint called soft background subtraction. This approach is shown to provide sampling artifact reduction when reconstructing sparse objects, and more interestingly, when reconstructing sparse objects over a non-sparse background. The relevance of our approach is evaluated in cone-beam geometry on real clinical data.
authors: GE Healthcare, 78530 Buc, France.
authors: Hélène
authors: H
authors: Langet
authors: Cyril
authors: C
authors: Riddell
authors: Yves
authors: Y
authors: Trousset
authors: Arthur
authors: A
authors: Tenenhaus
authors: Elisabeth
authors: E
authors: Lahalle
authors: Gilles
authors: G
authors: Fleury
authors: Nikos
authors: N
authors: Paragios
mesh_terms: D000465:Algorithms; D000792:Angiography / Q000379:methods*; D016477:Artifacts; D001921:Brain / Q000473:pathology; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D015233:Models, Statistical; D012984:Software; D025321:Surgery, Computer-Assisted / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000379:methods*