Table 2.
Average ADC and CV Values for Phantom Test-Retest Acquisitions
| Vial No. | PVP % | 1.5 T |
3.0 T |
1.5 T vs. 3.0 T |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| tDWI |
dDWI |
CV tDWI–dDWI | tDWI |
dDWI |
CV tDWI–dDWI | tDWI | dDWI | ||||||||||
| ADC Test | ADC Retest | CV Test–Retest | ADC Test | ADC Retest | CV Test–Retest | ADC Test | ADC Retest | CV Test–Retest | ADC Test | ADC Retest | CV Test–Retest | CV 1.5 T–3.0 T | CV 1.5 T–3.0 T | ||||
| 1 | 0 | 1.13 ± 0.01 | 1.13 ± 0.02 | 0.0 | 1.14 ± 0.02 | 1.15 ± 0.02 | 1.0 | 0.1 | 1.13 ± 0.01 | 1.13 ± 0.01 | 0.1 | 1.13 ± 0.01 | 1.14 ± 0.01 | 0.7 | 0.2 | 0.0 | 0.5 |
| 2 | 0 | 1.12 ± 0.02 | 1.13 ± 0.02 | 0.6 | 1.12 ± 0.02 | 1.14 ± 0.02 | 1.3 | 0.2 | 1.13 ± 0.01 | 1.12 ± 0.01 | 0.4 | 1.12 ± 0.01 | 1.15 ± 0.01 | 1.6 | 0.7 | 0.3 | 0.0 |
| 3 | 0 | 1.15 ± 0.01 | 1.17 ± 0.02 | 1.5 | 1.13 ± 0.01 | 1.16 ± 0.02 | 1.4 | 1.0 | 1.14 ± 0.01 | 1.16 ± 0.03 | 1.4 | 1.13 ± 0.01 | 1.17 ± 0.01 | 2.4 | 0.5 | 0.6 | 0.5 |
| 4 | 10 | 0.86 ± 0.01 | 0.88 ± 0.01 | 1.8 | 0.86 ± 0.01 | 0.88 ± 0.01 | 1.6 | 0.1 | 0.86 ± 0.01 | 0.87 ± 0.01 | 0.6 | 0.85 ± 0.01 | 0.87 ± 0.01 | 2.0 | 1.0 | 1.2 | 1.6 |
| 5 | 10 | 0.85 ± 0.01 | 0.88 ± 0.01 | 2.4 | 0.85 ± 0.01 | 0.88 ± 0.01 | 2.5 | 0.3 | 0.84 ± 0.01 | 0.87 ± 0.01 | 2.2 | 0.84 ± 0.01 | 0.88 ± 0.01 | 3.0 | 0.1 | 0.7 | 0.5 |
| 6 | 20 | 0.63 ± 0.01 | 0.64 ± 0.01 | 1.0 | 0.64 ± 0.01 | 0.65 ± 0.01 | 1.5 | 0.9 | 0.63 ± 0.01 | 0.64 ± 0.00 | 0.9 | 0.63 ± 0.01 | 0.64 ± 0.01 | 1.8 | 0.4 | 1.3 | 1.8 |
| 7 | 20 | 0.63 ± 0.00 | 0.65 ± 0.01 | 1.7 | 0.66 ± 0.01 | 0.67 ± 0.01 | 1.4 | 2.3 | 0.62 ± 0.01 | 0.65 ± 0.01 | 2.7 | 0.64 ± 0.01 | 0.68 ± 0.01 | 3.6 | 2.5 | 1.2 | 0.5 |
| 8 | 30 | 0.42 ± 0.01 | 0.44 ± 0.01 | 2.5 | 0.44 ± 0.01 | 0.45 ± 0.01 | 2.7 | 2.1 | 0.43 ± 0.01 | 0.44 ± 0.01 | 1.7 | 0.43 ± 0.01 | 0.45 ± 0.01 | 2.1 | 0.5 | 0.2 | 1.2 |
| 9 | 30 | 0.41 ± 0.01 | 0.43 ± 0.01 | 2.5 | 0.43 ± 0.01 | 0.44 ± 0.01 | 2.1 | 2.3 | 0.41 ± 0.01 | 0.42 ± 0.01 | 2.4 | 0.41 ± 0.01 | 0.43 ± 0.01 | 2.8 | 0.4 | 0.7 | 2.2 |
| 10 | 40 | 0.25 ± 0.01 | 0.25 ± 0.01 | 1.0 | 0.26 ± 0.01 | 0.26 ± 0.01 | 0.0 | 1.7 | 0.24 ± 0.01 | 0.24 ± 0.01 | 1.4 | 0.24 ± 0.01 | 0.25 ± 0.01 | 3.9 | 0.1 | 2.8 | 2.8 |
| 11 | 40 | 0.23 ± 0.01 | 0.24 ± 0.01 | 2.0 | 0.24 ± 0.01 | 0.25 ± 0.01 | 1.8 | 1.5 | 0.23 ± 0.01 | 0.24 ± 0.01 | 1.5 | 0.23 ± 0.01 | 0.24 ± 0.01 | 1.8 | 0.1 | 0.9 | 2.2 |
| 12 | 50 | 0.13 ± 0.02 | 0.12 ± 0.02 | 1.1 | 0.12 ± 0.02 | 0.13 ± 0.02 | 2.1 | 2.1 | 0.13 ± 0.02 | 0.12 ± 0.02 | 4.0 | 0.12 ± 0.02 | 0.12 ± 0.02 | 1.6 | 1.0 | 1.4 | 0.7 |
| 13 | 50 | 0.13 ± 0.01 | 0.13 ± 0.02 | 1.6 | 0.12 ± 0.01 | 0.13 ± 0.01 | 4.8 | 4.2 | 0.12 ± 0.01 | 0.11 ± 0.01 | 1.0 | 0.12 ± 0.01 | 0.12 ± 0.01 | 1.2 | 1.1 | 8.7 | 3.9 |
ADC is expressed in 10−3 mm2/s. CV values (%) mentioned in the table are between test–retest acquisitions, between tDWI and dDWI, and between 1.5 T and 3.0 T.
Abbreviations: ADC, apparent diffusion coefficient; dDWI, diagonal diffusion-weighted imaging; PVP, polyvinylpyrrolidone; tDWI, 3-scan trace diffusion-weighted imaging.