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Highly selective water and fat imaging applying multislice sequences without sensitivity to B 1 field inhomogeneities
Author(s) -
Schick Fritz,
Forster Jürgen,
Machann Jürgen,
Huppert Peter,
Claussen Claus D.
Publication year - 1997
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.1910380216
Subject(s) - excitation , multislice , homogeneity (statistics) , wafer , sensitivity (control systems) , nuclear magnetic resonance , interference (communication) , biological system , optics , physics , computer science , channel (broadcasting) , optoelectronics , electronic engineering , telecommunications , quantum mechanics , machine learning , engineering , biology
Improved selectivity to one chemical shift component was obtained using simultaneous slice‐selective and chemical shift‐selective excitation in sequences with usual spin‐echo refocusing. The new type of sequences can be applied on modern whole‐body units and permits multislice operation. Spatial‐spectral excitation is based on prior research in this field, but the proposed improved version provides off‐center slice excitation by the usual processing of the RF pulse envelopes. In addition, no irregular gradient shapes are necessary. The required B 0 homogeneity of the new method is similar to conventional “fat‐sat” techniques. In contrast to fat‐sat methods, selectivity to water is not reduced by unavoidable mis‐adjustments of the transmitter or B 1 field inhomogeneities in the newly developed approach. Thus, the reported method has the potential to replace standard frequency selective fat‐sat sequences for most applications.