Expansion:
Mirrored FISP (Fast Imaging With Steady State Precession)
Steady State Free Precession
Contrast Enhanced Fourier Acquired in Steady State
Technique:
A series of sequential RF pulses is applied with a specific flip angle and interval TR. Three echoes result: an FID, SE, STE. A rewinder gradient restores the original phase state (a necessity to maintain a steady state). In the SSFP/PSIF/CE-FAST sequences, lack of a rephase slice select lobe spoils the FID, and SE and superimposed SE/STE's are produced. The effective TE is lengthened, producing relative T2 weighting
Typical Parameters:
Effective TE = TR + time from RF pulse to Echo = T2-weighting
Reference:
All You Really Need to Know About MR Physics, 7-8.
Contributor:
Related Sequences/Terms:
GRE, FISP, FAST, Steady State, STE, SE, FID
Comments:
| Fast T2-weighted images |
| Trade-off is low signal-to-noise ratio |
| motion and flow-sensitive |
Pulse Sequence Diagram:
Steady State GRE with Spin Echo Sampling