Highly selective water and fat imaging applying multislice sequences without sensitivity to B1 field inhomogeneities

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Abstract
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 B0 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 B1 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.