Improved T1-weighted two-dimensional MP-GRE imaging of the liver with variable flip angles for shaping the signal evolution
✍ Scribed by Frederick H. Epstein; John P. Mugler III; James R. Brookeman
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 863 KB
- Volume
- 4
- Category
- Article
- ISSN
- 1053-1807
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✦ Synopsis
Abstract
The recently introduced method of shaping the transient signal evolution in magnetization‐prepared gradient‐echo (MP‐GRE) imaging with variable flip angles has been applied to two‐dimensional (2D) MP‐GRE imaging of the abdomen. The technique was analyzed by using theoretical models and was implemented on a standard 1.5‐T whole‐body imager with a segmented acquisition. Theoretical models predicted that the variable‐flip‐angle 2D MP‐GRE sequence would increase liver‐spleen signal difference–to‐noise ratios by 290%, 110%, and 160% compared with a 2D MP‐GRE sequence with a flip angle of 10° and sequential phase encoding, a 2D MP‐GRE sequence with a flip angle of 30° and centric phase encoding, and the fast low‐angle shot sequence, respectively. Experimental measurements supported the theoretical predictions.