Lobos RA, Chan CC, Haldar JP. New Theory and Faster Computations for Subspace-Based
Sensitivity Map Estimation in Multichannel MRI.
IEEE Trans Med Imaging 2024;
43:286-296. [PMID:
37478037 PMCID:
PMC10848144 DOI:
10.1109/tmi.2023.3297851]
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Abstract
Sensitivity map estimation is important in many multichannel MRI applications. Subspace-based sensitivity map estimation methods like ESPIRiT are popular and perform well, though can be computationally expensive and their theoretical principles can be nontrivial to understand. In the first part of this work, we present a novel theoretical derivation of subspace-based sensitivity map estimation based on a linear-predictability/structured low-rank modeling perspective. This results in an estimation approach that is equivalent to ESPIRiT, but with distinct theory that may be more intuitive for some readers. In the second part of this work, we propose and evaluate a set of computational acceleration approaches (collectively known as PISCO) that can enable substantial improvements in computation time (up to ∼ 100× in the examples we show) and memory for subspace-based sensitivity map estimation.
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