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Multipurpose NMR imaging using stimulated echoes
Author(s) -
Matthaei D.,
Frahm J.,
Haase A.,
Merboldt K. D.,
Hänicke W.
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.1910030409
Subject(s) - nuclear magnetic resonance , pulse sequence , spin echo , computer science , multislice , image resolution , materials science , artificial intelligence , physics , magnetic resonance imaging , medicine , radiology
STEAM (stimulated‐echo acquisition mode) imaging techniques recently introduced by the authors are demonstrated to provide a versatile tool for improving the parametric specificity in NMR imaging. Stimulated echoes can be excited by a sequence of at least three rf pulses with flip angles of 90° or less. The main characteristics of the STEAM method are based on the great functional flexibility of an imaging sequence comprising three rf pulses unequal to 180° and three intervals prior to acquisition of the data. Major advantages are the easy access to contiguous multiplanar images, to CHESS (chemical‐shift‐selective) images, and to T 1 information. Moreover, the rf power deposition is considerably reduced as compared to spin‐echo NMR imaging sequences. Here first in vivo results on human extremities are presented including contiguous multislice images, multiple CHESS images, and spin‐lattice relaxation time images calculated from a series of simultaneously recorded T 1 ‐weighted STEAM images. © 1986 Academic Press, Inc.