GRE, GE, FE

Expansion:

Gradient Recalled Echo

Gradient Echo

Field Echo

Technique:

An initial RF pulse with a certain flip angle is performed in the presence of a slice select gradient. One application of a phase-encode gradient is performed followed by readout of the gradient echo in the presence of a frequency-encoding (readout) gradient.

Typical Paramaters:

For T2* weighting:

TR > 2000-3000 msec

TE > 15 msec

flip angle: variable

Reference:

All You Really Need to Know About MRI Physics, 5-2

Contributor:

 

Related Sequences/Terms:

3D GRE, SE, FE, GE

Comments:

very sensitive to field inhomogeneities that cause T2* dephasing (blood, calcium, air/tissue interfaces)

Pulse Sequence Diagrams:

Gradient Recalled Pulse Sequence