Table 4.
Average Quality Scores in the Diffusion Phantom
| 1.5 T |
3.0 T |
|||
|---|---|---|---|---|
| tDWI | dDWI | tDWI | dDWI | |
| b500 | ||||
| Anatomic distortion | 4.0 ± 0.0 | 4.0 ± 0.0 | 3.0 ± 0.0 | 3.0 ± 0.0 |
| Image sharpness | 4.0 ± 0.0 | 4.0 ± 0.0 | 3.5 ± 0.7 | 3.0 ± 0.0 |
| Artifacts | 4.0 ± 0.0 | 4.0 ± 0.0 | 4.0 ± 0.0 | 4.0 ± 0.0 |
| Sum | 12.0 ± 0.0 | 12.0 ± 0.0 | 10.5 ± 0.7 | 10.0 ± 0.0 |
| b900 | ||||
| Anatomic distortion | 4.0 ± 0.0 | 4.0 ± 0.0 | 3.0 ± 0.0 | 4.0 ± 0.0 |
| Image sharpness | 4.5 ± 0.7 | 4.0 ± 0.0 | 3.5 ± 0.7 | 4.0 ± 0.0 |
| Artifacts | 4.0 ± 0.0 | 4.0 ± 0.0 | 4.0 ± 0.0 | 4.0 ± 0.0 |
| Sum | 12.5 ± 0.7 | 12.0 ± 0.0 | 10.5 ± 0.7 | 11.0 ± 0.0 |
| b2000 | ||||
| Anatomic distortion | 4.5 ± 0.7 | 4.5 ± 0.7 | 4.0 ± 0.0 | 3.5 ± 0.7 |
| Image sharpness | 5.0 ± 0.0 | 5.0 ± 0.0 | 4.0 ± 0.0 | 4.5 ± 0.7 |
| Artifacts | 4.0 ± 0.0 | 4.0 ± 0.0 | 4.0 ± 0.0 | 4.0 ± 0.0 |
| Sum | 13.5 ± 0.7 | 13.5 ± 0.7 | 12.0 ± 0.0 | 12.0 ± 1.4 |
| ADC | ||||
| Overall quality | 4.5 ± 0.7 | 4.5 ± 0.7 | 3.0 ± 0.0 | 3.5 ± 0.7 |
The average quality scores are those from 2 observers for in vitro tDWI and dDWI measurements at 1.5 T and 3.0 T.
Abbreviations: ADC, apparent diffusion coefficient; dDWI, diagonal diffusion-weighted imaging; tDWI, 3-scan trace diffusion-weighted imaging.