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Cardiac magnetic resonance parallel imaging at 3.0 Tesla: Technical feasibility and advantages
Author(s) -
McGee Kiaran P.,
Debbins Josef P.,
Boskamp Ed B.,
Blawat LeRoy,
Angelos Lisa,
King Kevin F.
Publication year - 2004
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.20015
Subject(s) - imaging phantom , magnetic resonance imaging , signal to noise ratio (imaging) , field strength , nuclear medicine , specific absorption rate , nuclear magnetic resonance , materials science , contrast to noise ratio , cardiac imaging , magnetic field , image quality , physics , optics , medicine , radiology , computer science , telecommunications , quantum mechanics , artificial intelligence , antenna (radio) , image (mathematics)
Purpose To quantify changes in signal‐to‐noise ratio (SNR), contrast‐to‐noise ratio (CNR), specific absorption rate (SAR), RF power deposition, and imaging time in cardiac magnetic resonance imaging with and without the application of parallel imaging at 1.5 T and 3.0 T. Materials and Methods Phantom and volunteer data were acquired at 1.5 T and 3.0 T with and without parallel imaging. Results Doubling field strength increased phantom SNR by a factor of 1.83. In volunteer data, SNR and CNR values increased by factors of 1.86 and 1.35, respectively. Parallel imaging (reduction factor = 2) decreased phantom SNR by a factor of 1.84 and 2.07 when compared to the full acquisition at 1.5 T and 3.0 T, respectively. In volunteers, SNR and CNR decreased by factors of 2.65 and 2.05 at 1.5 T and 1.99 and 1.75 at 3.0 T, respectively. Doubling the field strength produces a nine‐fold increase in SAR (0.0751 to 0.674 W/kg). Parallel imaging reduced the total RF power deposition by a factor of two at both field strengths. Conclusions Parallel imaging decreases total scan time at the expense of SNR and CNR. These losses are compensated at higher field strengths. Parallel imaging is effective at reducing total power deposition by reducing total scan time. J. Magn. Reson. Imaging 2004;19:291–297. © 2004 Wiley‐Liss, Inc.