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Improved acceleration of phase-contrast flow imaging with magnitude difference regularization

Title
Improved acceleration of phase-contrast flow imaging with magnitude difference regularization
Authors
Shin T.Shin W.
Ewha Authors
신태훈
Issue Date
2020
Journal Title
Magnetic Resonance Imaging
ISSN
0730-725XJCR Link
Citation
Magnetic Resonance Imaging vol. 67, pp. 1 - 6
Keywords
Iterative image reconstructionPhase-contrast flow imagingRegularizationScan acceleration
Publisher
Elsevier Inc.
Indexed
SCI; SCIE; SCOPUS scopus
Document Type
Article
Abstract
Purpose: To develop a regularized image reconstruction algorithm for improved scan acceleration of phase-contrast (PC) flow MRI. Methods: Based on the magnitude similarity between bipolar-encoded k-space data, magnitude-difference regularization was incorporated into the conventional compressed sensing (CS) reconstruction. The gradient of the magnitude regularization was derived so the reconstruction problem can be solved using non-linear conjugate gradient with backtracking line search. Phase contrast flow data obtained in the peripheral arteries of healthy and patient subjects were retrospectively undersampled for testing the proposed reconstruction method. Three-dimensional velocity-encoded PC flow MRI was performed with prospective 4-fold undersampling for measuring arotic flow velocity in a healthy volunteer. Results: In the femoral arteries of healthy volunteers, the root-mean-square (RMS) errors of mean velocities were 0.56 ± 0.09 cm/s with CS-only reconstruction and 0.46 ± 0.08 cm/s with addition of magnitude regularization for three-fold acceleration; 1.34 ± 0.17 cm/s (CS only) and 1.08 ± 0.15 cm/s (magnitude regularized) for four-fold acceleration. In the iliac arteries of the patient, the RMS errors of mean velocities were 0.72 ± 0.12 cm/s and 0.56 ± 0.10 for three-fold acceleration, and 1.75 ± 0.21 and 1.24 ± 0.19 cm/s for four-fold acceleration (in the order of CS-only and magnitude regularized reconstructions). In the popliteal arteries, the RMS errors were 0.61 ± 0.10 cm/s and 0.42 ± 0.11 for three-fold acceleration, and 1.41 ± 0.19 and 1.12 ± 0.17 cm/s for four-fold acceleration. The maximum through-plane mean flow velocities were measured as 63.2 cm/s and 84.5 cm/s in ascending and descending aortas, respectively. Conclusion: The addition of magnitude-difference regularization into conventional CS reconstruction improves the accuracy of image reconstruction using highly undersampled phase-contrast flow MR data. © 2019 Elsevier Inc.
DOI
10.1016/j.mri.2019.12.001
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엘텍공과대학 > 휴먼기계바이오공학부 > Journal papers
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