Fast repetition spin-echo method for measuring spin-spin relaxation times
β Scribed by Mark J Forster
- Publisher
- Elsevier Science
- Year
- 1989
- Weight
- 311 KB
- Volume
- 84
- Category
- Article
- ISSN
- 0022-2364
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π SIMILAR VOLUMES
Calculation of tissue TI in double spin-echo imaging (90"-T-I 80"-2T-1 SO0) using two repetition times (6, and b2) has entailed an approximation that ignores the two 180" pulses. The theoretical consequence of the simplification is to overestimate TI with a fractional error that increases with incre
In order to satisfy the Carr-Purcell-Meiboom-Gill (CPMG) condition, echo shift as dictated in fast-spin-echo (FSE)-based Dixon imaging was previously achieved by applying a time shift to the readout gradient and the data acquisition window. Accordingly, interecho spacing is increased, which entails
## It is shown how Crame Β΄r-Rao theory may be used to determine Here we use the theory of Crame Β΄r-Rao lower bounds (5the optimal sampling pattern for measuring the NMR spin-spin 8) to determine the optimum choice of sampling times for relaxation time, T 2 . The results may also be applied to the