• Object ID: 00000018WIA305AE870GYZ
  • Topic ID: id_40021295 Version: 1.3
  • Date: Apr 4, 2022 2:59:59 PM

Flip Angle - GRE

Select a Flip Angle for the desired image contrast weight and Signal-to-Noise Ratio (SNR) for GRE pulse sequences.

2D GRE/SPGR
  • Given a constant TR, increase the flip angle, and the T1 contrast increases.
  • For T1 contrast, select a value between 40 to 60°.
  • For T2* contrast, select a value between 20 to 30°.
3D GRE/SPGR
  • Lower flip angles can be used when paired with short TR/TE.
  • For T1 contrast, select a value between 25 to 45°.
  • For T2* contrast, select a value between 5 to 8°. Decrease the flip angle and the T2* contrast increases, and the SNR decreases.