AAAI Publications, Thirty-Second AAAI Conference on Artificial Intelligence

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Compressed Sensing MRI Using a Recursive Dilated Network
Liyan Sun, Zhiwen Fan, Yue Huang, Xinghao Ding, John Paisley

Last modified: 2018-04-26

Abstract


Compressed sensing magnetic resonance imaging (CS-MRI) is an active research topic in the field of inverse problems. Conventional CS-MRI algorithms usually exploit the sparse nature of MRI in an iterative manner. These optimization-based CS-MRI methods are often time-consuming at test time, and are based on fixed transform bases or shallow dictionaries, which limits modeling capacity. Recently, deep models have been introduced to the CS-MRI problem. One main challenge for CS-MRI methods based on deep learning is the trade off between model performance and network size. We propose a recursive dilated network (RDN) for CS-MRI that achieves good performance while reducing the number of network parameters. We adopt dilated convolutions in each recursive block to aggregate multi-scale information within the MRI. We also adopt a modified shortcut strategy to help features flow into deeper layers. Experimental results show that the proposed RDN model achieves state-of-the-art performance in CS-MRI while using far fewer parameters than previously required.

Keywords


compressed sensing; magnetic resonance imaging; deep neural networks

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