TY - JOUR
T1 - Myocardial suppression in vivo by spin locking with composite pulses
AU - Dixon, W. Thomas
AU - Oshinski, John N.
AU - Trudeau, Jon D.
AU - Arnold, Bradley C.
AU - Pettigrew, Roderic I.
PY - 1996/7
Y1 - 1996/7
N2 - Improved myocardium-blood contrast by myocardial suppression resulting from T1ρ-weighting in contrast-enhanced, gradient-echo, bright-blood cine images, acquired at 1.5T, is shown. In the standard images, blood has twice the intensity of muscle. In similar T1ρ-weighted images, it has 3-4 times the intensity of muscle. A composite spin-lock pulse before each observation pulse provides T1ρ-weighting. A typical pulse was: 90y-135x-360x-135x-90(- y) with element durations: 0.84, 1.26, 8.12, 1.26, and 0.84 ms. The tolerance of this composite pulse to shimming and frequency errors allows spin locking with comparatively weak RF and therefore low specific absorption rate (SAR). Initial clinical evaluation on patients with poor ventricular function demonstrates both a qualitative and quantitative improvement in delineation of myocardial borders.
AB - Improved myocardium-blood contrast by myocardial suppression resulting from T1ρ-weighting in contrast-enhanced, gradient-echo, bright-blood cine images, acquired at 1.5T, is shown. In the standard images, blood has twice the intensity of muscle. In similar T1ρ-weighted images, it has 3-4 times the intensity of muscle. A composite spin-lock pulse before each observation pulse provides T1ρ-weighting. A typical pulse was: 90y-135x-360x-135x-90(- y) with element durations: 0.84, 1.26, 8.12, 1.26, and 0.84 ms. The tolerance of this composite pulse to shimming and frequency errors allows spin locking with comparatively weak RF and therefore low specific absorption rate (SAR). Initial clinical evaluation on patients with poor ventricular function demonstrates both a qualitative and quantitative improvement in delineation of myocardial borders.
KW - cardiac imaging
KW - magnetization-prepared contrast
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U2 - 10.1002/mrm.1910360116
DO - 10.1002/mrm.1910360116
M3 - Article
C2 - 8795026
AN - SCOPUS:0029935991
SN - 0740-3194
VL - 36
SP - 90
EP - 94
JO - Magnetic Resonance in Medicine
JF - Magnetic Resonance in Medicine
IS - 1
ER -