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Self‐gated 4D multiphase, steady‐state imaging with contrast enhancement (MUSIC) using rotating cartesian K‐space (ROCK): Validation in children with congenital heart disease
Author(s) -
Han Fei,
Zhou Ziwu,
Han Eric,
Gao Yu,
Nguyen KimLien,
Finn J. Paul,
Hu Peng
Publication year - 2017
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26376
Subject(s) - magnetic resonance imaging , k space , contrast (vision) , cartesian coordinate system , voxel , image quality , computer science , medicine , artificial intelligence , radiology , image (mathematics) , mathematics , geometry
Purpose To develop and validate a cardiac‐respiratory self‐gating strategy for the recently proposed multiphase steady‐state imaging with contrast enhancement (MUSIC) technique. Methods The proposed SG strategy uses the ROtating Cartesian K‐space (ROCK) sampling, which allows for retrospective k‐space binning based on motion surrogates derived from k‐space center line. The k‐space bins are reconstructed using a compressed sensing algorithm. Ten pediatric patients underwent cardiac MRI for clinical reasons. The original MUSIC and 2D‐CINE images were acquired as a part of the clinical protocol, followed by the ROCK‐MUSIC acquisition, all under steady‐state intravascular distribution of ferumoxytol. Subjective scores and image sharpness were used to compare the images of ROCK‐MUSIC and original MUSIC. Results All scans were completed successfully without complications. The ROCK‐MUSIC acquisition took 5 ± 1 min, compared to 8 ± 2 min for the original MUSIC. Image scores of ROCK‐MUSIC were significantly better than original MUSIC at the ventricular outflow tracts (3.9 ± 0.3 vs. 3.3 ± 0.6, P < 0.05). There was a strong trend toward superior image scores for ROCK‐MUSIC in the other anatomic locations. Conclusion ROCK‐MUSIC provided images of equal or superior image quality compared to original MUSIC, and this was achievable with 40% savings in scan time and without the need for physiologic signal. Magn Reson Med 78:472–483, 2017. © 2016 International Society for Magnetic Resonance in Medicine