27 Balanced Steady-State Free Precession (b-SSFP)

Balanced Steady-State Free Precession (b-SSFP) sequences are part of the family of gradient echo-based techniques used in a variety of MR applications. The b-SSFP technique is set apart by the fact that during the acquisition, the dephasing induced by each applied gradient is compensated for by a gradient of opposite polarity resulting in a unique T2/T1 contrast. Although this contrast may not provide the same diagnostic information as a classic SE-based T1- or T2-weighted image, the technique exhibits very high SNR and excellent tissue differentiation making it well suited for imaging abdominal, vascular, and cardiac structures. The examples provided in Fig. 27.1 demonstrate coronal b-SSFP (trueFISP) imaging of the upper abdomen (A) without and (B

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