Citation, DOI & article data
When the TR is very short, the best flip angle to maximize 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.
History and etymology
- 1. Donald G. Mitchell, Mark Cohen (Ph.D.). MRI Principles. (2004) ISBN: 9780721600246
- 2. Bosmans H, Marchal G, Lukito G et al. Time-Of-Flight MR Angiography of the Brain: Comparison of Acquisition Techniques in Healthy Volunteers. AJR Am J Roentgenol. 1995;164(1):161-7. doi:10.2214/ajr.164.1.7998531
- 3. Graeme M. Bydder, Gary D. Fullerton, Ian R. Young. MRI of Tissues with Short T2s or T2*s. (2012) ISBN: 9781118590515
- 4. Shampo M, Kyle R, Steensma D. Richard Ernst—Nobel Prize for Nuclear Magnetic Resonance Spectroscopy. Mayo Clin Proc. 2012;87(12):e109. doi:10.1016/j.mayocp.2012.01.023
- 5. Alger J. The 1991 Nobel Prize in Chemistry Awarded to an MRI Investigator. J Comput Assist Tomogr. 1992;16(1):1-2. PMID 1729287