Title :
Sparsity-based PET image reconstruction using MRI learned dictionaries
Author :
Jing Tang ; Yanhua Wang ; Rutao Yao ; Ying, Leslie
Author_Institution :
Dept. of Electr. & Comput. Eng., Oakland Univ., Rochester, MI, USA
fDate :
April 29 2014-May 2 2014
Abstract :
Incorporating anatomical information obtained by magnetic resonance (MR) imaging has shown its promises to improve the positron emission tomography (PET) imaging quality. In this paper, we propose a novel maximum a posteriori (MAP) PET image reconstruction technique using a sparse prior whose dictionary is learned from the corresponding MR images. Specifically, a PET image is divided into three-dimensional overlapping patches which are expected to be sparsely represented over a redundant dictionary. With the assumption that the PET and MR images of a patient can be sparsified under a common dictionary, the dictionary is learned from the MR image to involve anatomical measurement in PET image reconstruction. The PET image and its sparse representation are updated alternately in the iterative reconstruction process. We evaluated the performance of the proposed method quantitatively, using a realistic simulation with the BrainWeb database phantoms. Noticeable improvement on the noise versus bias tradeoff has been demonstrated in images reconstructed from the proposed method, compared to that from the conventional smoothness MAP method.
Keywords :
biomedical MRI; compressed sensing; dictionaries; image reconstruction; image representation; iterative methods; maximum likelihood estimation; medical image processing; positron emission tomography; 3D overlapping patch; BrainWeb database phantoms; MR image; MRI learned dictionary; anatomical measurement; iterative reconstruction process; magnetic resonance imaging; maximum a posteriori PET; positron emission tomography; smoothness MAP method; sparse representation; sparsity-based PET image reconstruction; Brain modeling; Dictionaries; Image reconstruction; Matching pursuit algorithms; Noise; Positron emission tomography; MRI prior; PET image reconstruction; dictionary learning; sparse representation;
Conference_Titel :
Biomedical Imaging (ISBI), 2014 IEEE 11th International Symposium on
Conference_Location :
Beijing
DOI :
10.1109/ISBI.2014.6868063