Quantitative results of attenuation, noise, and CNRa
| CTDIvol (mGy) | CI | VMI65keV | ||||
|---|---|---|---|---|---|---|
| 55 | 49.8 | 44.7 | 55 | 49.8 | 44.7 | |
| Attenuation | ||||||
| GM | 34.0 ± 1.4 | 33.4 ± 1.5 | 34.1 ± 1.7 | 34.6 ± 1.3 | 34.2 ± 1.2 | 35.1 ± 1.5 |
| WM | 26.5 ± 1.2 | 26.1 ± 1.5 | 27.0 ± 1.6 | 26.4 ± 1.1 | 26.0 ± 1.3 | 27.1 ± 1.4 |
| Thalamus | 33.6 ± 1.5 | 33.2 ± 1.6 | 34.4 ± 1.9 | 34.4 ± 1.4 | 33.9 ± 1.4 | 35.5 ± 1.8 |
| Posterior limb | 26.5 ± 2.2 | 26.3 ± 2.0 | 26.6 ± 2.2 | 26.1 ± 1.4 | 26.0 ± 1.7 | 26.6 ± 2.0 |
| Caudate nucleus | 34.5 ± 4.4 | 35.2 ± 2.1 | 35.4 ± 2.3 | 35.7 ± 1.5 | 35.8 ± 1.8 | 36.3 ± 2.1 |
| Extraocular muscle | 32.8 ± 5.6 | 31.1 ± 6.4 | 33.2 ± 8.1 | 31.9 ± 5.6 | 30.8 ± 6.2 | 35.4 ± 9.9 |
| Medulla oblongata | 31.5 ± 4.3 | 32.0 ± 4.5 | 34.6 ± 4.9 | 31.1 ± 3.3 | 31.0 ± 3.0 | 33.9 ± 3.7 |
| Noise | ||||||
| GM | 4.5 ± 0.8 | 4.6 ± 0.7 | 4.8 ± 0.8 | 3.1 ± 0.6 | 3.1 ± 0.5 | 3.2 ± 0.5 |
| WM | 4.5 ± 0.7 | 4.8 ± 0.8 | 4.9 ± 0.7 | 3.0 ± 0.5 | 3.2 ± 0.5 | 3.3 ± 0.6 |
| Thalamus | 5.8 ± 0.8 | 6.0 ± 1.0 | 6.1 ± 1.1 | 4.0 ± 0.7 | 4.2 ± 0.8 | 4.3 ± 0.9 |
| Posterior limb | 5.2 ± 1.0 | 5.5 ± 1.1 | 5.6 ± 1.3 | 3.6 ± 0.8 | 3.7 ± 0.9 | 3.9 ± 1.0 |
| Caudate nucleus | 5.4 ± 1.1 | 5.6 ± 1.2 | 5.6 ± 0.8 | 3.7 ± 0.9 | 3.8 ± 0.8 | 3.8 ± 0.6 |
| Extraocular muscle | 5.3 ± 1.4 | 5.6 ± 1.6 | 6.1 ± 2.1 | 3.6 ± 1.1 | 3.7 ± 1.3 | 4.2 ± 1.6 |
| Medulla oblongata | 6.1 ± 1.2 | 6.4 ± 1.2 | 6.7 ± 1.4 | 4.4 ± 1.0 | 4.6 ± 0.9 | 4.7 ± 0.9 |
| GM-WM CNR | 2.5 ± 0.5 | 2.4 ± 0.5 | 2.3 ± 0.5 | 3.4 ± 0.5 | 3.3 ± 0.5 | 3.2 ± 0.5 |
↵a Results are means ± SDs.