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Optimal b-values (in s/mm2) for each shell and corresponding number of directions (Ntotal), expressed as a percentage of the total number of volumes acquired. Results are shown for the 2-shell, 3-shell and 4-shell cases, assuming a T 2 value of 150 ms
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| 2 shells | b-value | 0 | 395 | 1781 | ||
| Ntotal | 12% | 29% | 59% | |||
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| 3 shells | b-value | 0 | 404 | 990 | 2574 | |
| Ntotal | 6% | 19% | 28% | 47% | ||
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| 4 shells | b-value | 0 | 405 | 990 | 1901 | 3784 |
| Ntotal | 3% | 9% | 16% | 29% | 43% | |
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