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Title: Optimization of regularization parameters in compressed sensing of magnetic resonance angiography: Can statistical image metrics mimic radiologists' perception?
Authors: Akasaka, Thai
Fujimoto, Koji  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1209-7949 (unconfirmed)
Yamamoto, Takayuki
Okada, Tomohisa  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-2312-5677 (unconfirmed)
Fushimi, Yasutaka
Yamamoto, Akira
Tanaka, Toshiyuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-5962-9119 (unconfirmed)
Togashi, Kaori
Author's alias: 藤本, 晃司
Issue Date: 8-Jan-2016
Publisher: Public Library of Science
Journal title: PLOS ONE
Volume: 11
Issue: 1
Thesis number: e0146548
Abstract: In Compressed Sensing (CS) of MRI, optimization of the regularization parameters is not a trivial task. We aimed to establish a method that could determine the optimal weights for regularization parameters in CS of time-of-flight MR angiography (TOF-MRA) by comparing various image metrics with radiologists' visual evaluation. TOF-MRA of a healthy volunteer was scanned using a 3T-MR system. Images were reconstructed by CS from retrospectively under-sampled data by varying the weights for the L1 norm of wavelet coefficients and that of total variation. The reconstructed images were evaluated both quantitatively by statistical image metrics including structural similarity (SSIM), scale invariant feature transform (SIFT) and contrast-to-noise ratio (CNR), and qualitatively by radiologists' scoring. The results of quantitative metrics and qualitative scorings were compared. SSIM and SIFT in conjunction with brain masks and CNR of artery-to-parenchyma correlated very well with radiologists' visual evaluation. By carefully selecting a region to measure, we have shown that statistical image metrics can reflect radiologists' visual evaluation, thus enabling an appropriate optimization of regularization parameters for CS.
Description: The fifth author’s name is spelled incorrectly. The correct name is: Yasutaka Fushimi.
Rights: © 2016 Akasaka et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
URI: http://hdl.handle.net/2433/210199
DOI(Published Version): 10.1371/journal.pone.0146548
PubMed ID: 26744843
Related Link: https://doi.org/10.1371/journal.pone.0197140
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