Preserving vessel conspicuity and contrast in local frequency maps by processing channel phase images prior to combination
Zahra Hosseini1, Junmin Liu2, and Maria Drangova3
1Biomedical Engineering Graduate Program, Western University, London, ON, Canada, 2Imaging Research Laboratories, Robarts Research Institute, London, ON, Canada, 3Department of Medical Biophysics, Western University, London, ON, Canada
Local frequency shift (LFS) mapping from multi-channel acquisition is traditionally performed with channel-combined data set prior to background field removal. In this work we utilize inter-echo
variance channel combination to evaluate the effect of pre-channel combination
(pre-CC) phase image processing on the quality of LFS maps. We compare our
results with post-channel combination (post-CC) LFS maps. The results
illustrate superior performance in the contrast of LFS maps resulting from
pre-CC processing compared to the post-CC LFS maps. Several examples where vessel
conspicuity is lost through post–CC processing but preserved through pre-CC
processing are presented.
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