Table 1.
Mean and standard deviation of B0-maps, MRSI spectral linewidth (FWHM), signal-to-noise ratio (SNR), and goodness of fit measure by Cramer-Rao lower bounds (CRLB of tCr) metric, contrast-to-noise ratio (CNR of 2HG), the percentage of voxels with acceptable quality (i.e. FWHM < 0.1 ppm, CRLB < 20%, SNR > 10).
| ΔB0 (Hz) | FWHM (ppm) | SNR | CRLB (%) | CNR | Voxels (%) | |
|---|---|---|---|---|---|---|
| *2SHbox | 26.17 ± 1.56 | 0.071 ± 0.032 | 21.64 ± 6.95 | 10.47 ± 15.43 | 0.58 | 78.38 ± 7.39 |
| #2SHbrain | 21.40 ± 1.29 | 0.069 ± 0.033 | 22.35 ± 6.08 | 10.12 ± 15.34 | 0.28 | 84.45 ± 4.60 |
| *2SHbox + AC/DCbrain | 14.24 ± 3.03 | 0.053 ± 0.021 | 27.83 ± 7.72 | 8.85 ± 12.03 | 1.29 | 93.43 ± 5.36 |
| #2SHbrain + AC/DCbrain | 13.34 ± 2.00 | 0.059 ± 0.024 | 33.26 ± 5.65 | 8.54 ± 11.52 | 1.65 | 93.55 ± 0.64 |
| §(2SHbrain + AC/DCbrain)joint | 11.17 | 0.051 ± 0.023 | 28.38 ± 5.38 | 8.22 ± 11.99 | NA | 95 |
The CNR was calculated for tumor 2HG in the mutant IDH1 patient (NA not acquired).
*This shim was measured in four subjects.
#This shim was measured in two subjects.
§This shim was measured in one subject.