MRI techniques such as quantitative imaging and parallel transmit require precise knowledge of the radio-frequency transmit field (). Three published methods were optimized for robust mapping at 3T in the human brain: three-dimensional (3D) actual flip angle imaging (AFI), 3D echo-planar imaging (E
Mapping of the Radiofrequency Field
β Scribed by E.K. Insko; L. Bolinger
- Book ID
- 102592166
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 499 KB
- Volume
- 103
- Category
- Article
- ISSN
- 1064-1858
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## Abstract A new method has been developed for fast imageβbased measurements of the transmitted radiofrequency (RF) field. The method employs an actual flipβangle imaging (AFI) pulse sequence that consists of two identical RF pulses followed by two delays of different duration (TR~1~ < TR~2~). Aft
## Abstract Rapid 3D mapping of __T__~1~ relaxation times is valuable in diverse clinical applications. Recently, the variable flip angle (VFA) spoiled gradient recalled echo approach was shown to be a practical alternative to conventional methods, providing better precision and speed. However, the
## Abstract An inhomogeneous radiofrequency (RF) magnetic field is an essential source of error for the quantification of MRI and MRS parameters. To correct for effects of RF inhomogeneities in 3D data sets, it is necessary to have knowledge of the 3D RF distribution in the sample. In this paper a