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Rapid NMR imaging of dynamic processes using the FLASII technique
Author(s) -
Frahm Jens,
Haase Axel,
Matthaei Dieter
Publication year - 1986
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.1910030217
Subject(s) - dynamic imaging , flash (photography) , nuclear magnetic resonance , temporal resolution , signal (programming language) , gradient echo , time constant , physics , computer science , materials science , magnetic resonance imaging , image processing , optics , computer vision , image (mathematics) , medicine , radiology , electrical engineering , engineering , digital image processing , programming language
FLASH (Fast Low‐Angle SHot) imaging is a new method for rapid NMR imaging which has been demonstrated to provide abdominal images without artifacts due to respiratory or peristaltic motions. The sequence typically employs 15° radiofrequency excitation pulses and acquires a free induction decay signal in the form of a gradient echo. Here FLASH images are recorded in the presence of dynamic processes with time constants even smaller than the measuring time of about 2 s for an image with a 128 × 128‐pixel resolution. Experiments are carried out on flow phantoms and on rabbits yielding heart images without gating of the cardiac motion. © 1986 Academic Press, Inc.