Novel lossless fMRI image compression based on motion compensation and customized entropy coding

Authors:
Victor Sanchez;Panos Nasiopoulos;Rafeef Abugharbieh
Affiliations:
Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC, Canada;Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC, Canada;Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC, Canada
Venue:
IEEE Transactions on Information Technology in Biomedicine - Special section on biomedical informatics
Year:
2009

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Abstract

We recently proposed a method for lossless compression of 4-D medical images based on the advanced video coding standard (H.264/AVC). In this paper, we present two major contributions that enhance our previous work for compression of functional MRI (fMRI) data: 1) a new multiframe motion compensation process that employs 4-D search, variable-size block matching, and bidirectional prediction; and 2) a new context-based adaptive binary arithmetic coder designed for lossless compression of the residual and motion vector data. We validate our method on real fMRI sequences of various resolutions and compare the performance to two state-of-the-art methods: 4D-JPEG2000 and H.264/AVC. Quantitative results demonstrate that our proposed technique significantly outperforms current state of the art with an average compression ratio improvement of 13%.