Tagging of the magnetization with the transition zones of 360 degrees rotations generated by a tandem of two adiabatic DANTE inversion sequences.
A new technique is presented for generating myocardial tagging using the signal intensity minima of the transition zones between the bands of 0 degrees and 360 degrees rotations, induced by a tandem of two adiabatic delays alternating with nutations for tailored excitation (DANTE) inversion sequences. With this approach, the underlying matrix corresponds to magnetization that has experienced 0 degrees or 360 degrees rotations. The DANTE sequences were implemented from adiabatic parent pulses for insensitivity of the underlying matrix to B(1) inhomogeneity. The performance of the proposed tagging technique is demonstrated theoretically with computer simulations and experimentally on phantom and on the canine heart, using a surface coil for both RF transmission and signal reception. The simulations and the experimental data demonstrated uniform grid contrast and sharp tagging profiles over a twofold variation of the B(1) field magnitude.
Tsekos
Nikolaos V
NV
Cardiovascular Imaging Laboratory, Mallinckrodt Institute of Radiology, Washington University Medical Center, 510 S. Kingshighway Blvd., Box 8225, St. Louis, Missouri 63110, USA.
Garwood
Michael
M
Ugurbil
Kâmil
K
D000818:Animals; D004285:Dogs; D008279:Magnetic Resonance Imaging / Q000379:methods*; D023421:Models, Animal; D009200:Myocardial Contraction; D009206:Myocardium / Q000473:pathology; D019047:Phantoms, Imaging