Table 2.
g‐Factors and CRLB values for tCr and tCho averaged over all five volunteers listed for the different PI accelerations and for each calibration dataset
| g‐Factors [a.u.] | ||||
|---|---|---|---|---|
| 2‐Fold undersampled | 4‐Fold undersampled | |||
| Variable (R = 1.78) | Constant (R = 2) | Variable (R = 2.91) | Constant (R = 4) | |
| iMUSICAL | 1.07 ± 0.11 (1.07) | 1.03 ± 0.11 (1.03) | 1.27 ± 0.23 (1.28) | 1.19 ± 0.22 (1.19) |
| aMUSICAL static | 1.19 ± 0.15 (1.19) | 1.13 ± 0.23 (1.12) | 1.48 ± 0.36 (1.45) | 1.29 ± 0.47 (1.23) |
| aMUSICAL moved | 1.19 ± 0.16 (1.19) | 1.14 ± 0.29 (1.13) | 1.50 ± 0.39 (1.46) | 1.42 ± 0.59 (1.34) |
| tCr CRLB [%] | ||||
| 2‐Fold undersampled | 4‐Fold undersampled | |||
| Variable (R = 1.78) | Constant (R = 2) | Variable (R = 2.91) | Constant (R = 4) | |
| iMUSICAL | 4.7 ± 2.1 (4) | 4.7 ± 2.0 (4) | 5.7 ± 2.3 (5) | 9.5 ± 3.3 (9) |
| aMUSICAL static | 5.5 ± 2.1 (5) | 6.1 ± 2.2 (5) | 6.4 ± 2.4 (6) | 8.3 ± 2.8 (8) |
| aMUSICAL moved | 5.6 ± 2.1 (5) | 6.5 ± 2.8 (6) | 8.8 ± 3.0 (8) | 10.5 ± 3.6 (10) |
| tCho CRLB [%] | ||||
| 2‐Fold undersampled | 4‐Fold undersampled | |||
| Variable (R = 1.78) | Constant (R = 2) | Variable (R = 2.91) | Constant (R = 4) | |
| iMUSICAL | 5.4 ± 2.4 (5) | 5.5 ± 2.5 (5) | 6.4 ± 2.7 (6) | 7.1 ± 2.7 (6) |
| aMUSICAL static | 6.3 ± 2.5 (6) | 7.3 ± 2.5 (7) | 9.4 ± 3.0 (9) | 10.9 ± 3.5 (10) |
| aMUSICAL moved | 6.3 ± 2.4 (6) | 7.5 ± 3.1 (6) | 9.9 ± 3.2 (9) | 12.0 ± 3.7 (11) |
Mean values with standard deviations and medians in brackets are provided. Overall, the best results were obtained using iMUSICAL, followed by “static” aMUSICAL. Significantly worse values were obtained for “moved” aMUSICAL
Abbreviations: CRLBs, Cramer‐Rao lower bounds; tCho, total choline; tCr total creatine