Regularized Compression of MRI Data: Modular Optimization of Joint Reconstruction and Coding

• URL: http://arxiv.org/abs/2010.04065v2
• Date: Mon, 9 Nov 2020 15:01:34 GMT
• Title: Regularized Compression of MRI Data: Modular Optimization of Joint Reconstruction and Coding
• Authors: Veronica Corona, Yehuda Dar, Guy Williams, Carola-Bibiane Sch\"onlieb
• Abstract summary: We propose a framework for joint optimization of the MRI reconstruction and lossy compression. Our method produces compressed representations of medical images that achieve improved trade-offs between quality and bit-rate. Compared to regularization-based solutions, our optimization method provides PSNR gains between 0.5 to 1 dB at high bit-rates.
• Score: 2.370481325034443
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The Magnetic Resonance Imaging (MRI) processing chain starts with a critical acquisition stage that provides raw data for reconstruction of images for medical diagnosis. This flow usually includes a near-lossless data compression stage that enables digital storage and/or transmission in binary formats. In this work we propose a framework for joint optimization of the MRI reconstruction and lossy compression, producing compressed representations of medical images that achieve improved trade-offs between quality and bit-rate. Moreover, we demonstrate that lossy compression can even improve the reconstruction quality compared to settings based on lossless compression. Our method has a modular optimization structure, implemented using the alternating direction method of multipliers (ADMM) technique and the state-of-the-art image compression technique (BPG) as a black-box module iteratively applied. This establishes a medical data compression approach compatible with a lossy compression standard of choice. A main novelty of the proposed algorithm is in the total-variation regularization added to the modular compression process, leading to decompressed images of higher quality without any additional processing at/after the decompression stage. Our experiments show that our regularization-based approach for joint MRI reconstruction and compression often achieves significant PSNR gains between 4 to 9 dB at high bit-rates compared to non-regularized solutions of the joint task. Compared to regularization-based solutions, our optimization method provides PSNR gains between 0.5 to 1 dB at high bit-rates, which is the range of interest for medical image compression.

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