Combining Ordered Subsets and Momentum for Accelerated X-Ray CT Image Reconstruction

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Statistical X-ray computed tomography (CT) reconstruction can improve image quality from reduced dose scans, but requires very long computation time. Ordered subsets (OS) methods have been widely used for research in X-ray CT statistical image reconstruction (and are used in clinical PET and SPECT reconstruction). In particular, OS methods based on separable quadratic surrogates (OS-SQS) are massively parallelizable and are well suited tomodern computing architectures, but the number of iterations required for convergence should be reduced for better practical use. This paper introduces OS-SQS-momentum algorithms that combine Nesterov's momentum techniques with OS-SQS methods, greatly improving convergence speed in early iterations. If the number of subsets is too large, the OS-SQS-momentum methods can be unstable, so we propose diminishing step sizes that stabilize the method while preserving the very fast convergence behavior. Experiments with simulated and real 3D CT scan data illustrate the performance of the proposed algorithms.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2015-01
Language
English
Article Type
Article
Keywords

OPTIMIZATION TRANSFER; COMPUTED-TOMOGRAPHY; TRANSMISSION TOMOGRAPHY; 1ST-ORDER METHOD; ALGORITHMS; PROJECTION; PET

Citation

IEEE TRANSACTIONS ON MEDICAL IMAGING, v.34, no.1, pp.167 - 178

ISSN
0278-0062
DOI
10.1109/TMI.2014.2350962
URI
http://hdl.handle.net/10203/245461
Appears in Collection
MA-Journal Papers(저널논문)
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