PSIF, SSFP, CE-FAST

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:

Psif.gif (10409 bytes) Steady State GRE with Spin Echo Sampling

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