Tagging of the Magnetization with the Transition Zones of 360° Rotations Generated by a Tandem of Two Adiabatic DANTE Inversion Sequences |
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| Authors: | Nikolaos V Tsekos Michael Garwood Kmil Ugurbil |
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| Institution: | aCardiovascular Imaging Laboratory, Mallinckrodt Institute of Radiology, Washington University Medical Center, Box 8225, 510 S. Kingshighway Blvd. St. Louis, Missouri, 63110;bCenter for Magnetic Resonance Research and Department of Radiology, University of Minnesota, 2021 6th Street SE, Minneapolis, 55455, Minnesota |
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| Abstract: | A new technique is presented for generating myocardial tagging using the signal intensity minima of the transition zones between the bands of 0° and 360° 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° or 360° rotations. The DANTE sequences were implemented from adiabatic parent pulses for insensitivity of the underlying matrix to B1 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 B1 field magnitude. |
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| Keywords: | Abbreviations: taggingAbbreviations: adiabatic pulsesAbbreviations: heartAbbreviations: canines |
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