Ernst angle

The Ernst angle is the flip angle that maximises signal in T1-weighted sequences that have a short repetition time (TR).

When the TR is very short, the best flip angle to maximise signal can be quite small. Choosing the Ernst angle in this setting can increase signal by several fold. However, it should be remembered that depending on the situation, we may choose a non optimal flip angle to sacrifice maximal signal for better T1 contrast.

In T2-weighted sequences, a non optimal flip angle may be deliberately chosen to decrease T1 signal.

Adjusting the TR and flip angle toward or away from the Ernst angle is often a concern in MR angiography.

MRI physics
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Article Information

rID: 34994
Section: Physics
Tags: mri, physics, t1
Synonyms or Alternate Spellings:

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