Slice Profile

71 Slice Profile

Fig. 71.1

Ideally, a slice in MRI should experience a uniform radiofrequency (RF) excitation throughout its thickness. Sharp, distinct edges should exist with no excitation extending beyond slice boundaries. However, in practice the spatial excitation of spins is invariably a distribution ranging from the RF flip angle specified at the center of the slice to largely reduced flip angles at the ill-defined edges that excite regions well beyond the desired thickness. The resultant change in signal across the thickness of a slice is termed the slice profile.

Thus, in multislice imaging (the mainstay of clinical MR today), a slice of interest may suffer interference, or cross-talk

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