Table 4.
18F-NaF uptake and HU-values in PET VOI and in CT VOI
| No. | 18F-NaF uptake in PET VOI | 18F-NaF uptake in CT VOI | Averaged HU-value PET VOI | Averaged HU-value CT VOI |
|---|---|---|---|---|
| 1 | 3.6 | 1.9 | − 295 | 2273 |
| 2 | 5.9 | 2.5 | 1367 | 3616 |
| 3 | 4.8 | 3.7 | 1293 | 3489 |
| 4 | 7.6 | 3.0 | 603 | 3085 |
| 5 | 5.1 | 1.5 | 206 | 2769 |
| 6 | 5.8 | 2.8 | 1512 | 3616 |
| 7a | 2.6 | – | − 361 | – |
| 8 | 4.6 | 1.9 | 1140 | 3258 |
| 9 | 4.0 | 1.9 | 1242 | 3755 |
| 10b | 4.4 | 2.8 | 1102 | 3312 |
| 11 | 3.8 | 3.2 | 1835 | 3645 |
| 12 | 6.2 | 3.2 | 1414 | 3115 |
| 13 | 3.4 | 2.6 | 57 | 2465 |
| 14 | 7.2 | 5.5 | 699 | 2152 |
| 15 | 4.1 | 1.5 | − 137 | 1885 |
| 16 | 6.5 | 2.6 | 568 | 3289 |
18F-NaF uptake was expressed as percentage uptake of total incubation dose per gram
18F-NaF, 18F- Sodium Fluoride; PET, positron emission tomography; CT, computed tomography; HU, hounsfield units; VOI, volume of interest
(%Inc/g). 18F-NaF PET VOI was defined as ≥ 50% of maximum 18F-NaF uptake; CT calcification VOI was defined as Hounsfield Units ≥ 1000
aIn this carotid plaque, no calcifications could be identified on CT scan
bNon-culprit carotid plaque