Dual contrast GRASE (gradient-spin echo) imaging using mixed bandwidth
✍ Scribed by David A. Feinberg; Berthold Kiefer; Andrew W. Litt
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 471 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
Equal time spacing of RF pulses in the CPMG sequence imposes a constraint of equal signal read periods in spin‐echo train imaging. GRASE imaging differs by using multiple read gradients in each π‐π time interval, which are not constrained to be equal in number or duration. This additional degree of freedom is developed in dual contrast imaging. Closely spaced read periods are used for the PDW image to reduce T~2~ decay effects, while fewer low‐bandwidth read periods in each of several π‐π intervals are used to raise the signal‐to‐noise ratio and avoid signal averaging in the T~2~‐weighted image. Key words: magnetic resonance imaging; gradient‐spin echo; fast imaging.