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Snapshot flash mri. applications to t1, t2, and chemical‐shift imaging
Author(s) -
Haase A.
Publication year - 1990
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.1910130109
Subject(s) - magnetic resonance imaging , snapshot (computer storage) , real time mri , nuclear magnetic resonance , flash (photography) , flip angle , computer science , diffusion imaging , diffusion mri , materials science , physics , optics , radiology , medicine , operating system
Snapshot FLASH magnetic resonance imaging techniques have been developed to enable real‐time imaging of MR parameters. The first realization of the method is based on a 64 × 128 FLASH tomogram acquired within 200 ms, using improved MR system hardware conditions. The soft tissue contrast obtained in FLASH MRI almost disappears by using flip angles of less than 5° and repetition times of 3 ms. This work describes extensions of FLASH MRI placing conventional MR experiments before the whole imaging sequence. This creates images of any desired contrast without changing the measuring time. Examples of inversion‐recovery T1, spin‐echo T2, chemical‐shift‐selective, and spectroscopic FLASH MRI are presented. Further extensions to real‐time MRI of blood vessels, diffusion coefficients, combination with two‐dimensional MR spectroscopy experiments, and other nuclei are discussed.