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Threshold for each bone at different developmental stages (Hounsfield Units).
| P14 | P21 | P30 | P60 | P90 | P120 | P180 | P390 | |
|---|---|---|---|---|---|---|---|---|
| Frontal | 1,000 | 1,600 | 1,800 | 1,800 | 1,800 | 1,800 | 1,800 | 1,600 |
| Parietal | 1,000 | 1,800 | 1,800 | 2,000 | 1,800 | 1,800 | 1,800 | 1,600 |
| Pre-sphenoid | 800 | 1,000 | 1,000 | 1,200 | 1,400 | 1,400 | 1,400 | 1,200 |
| Basi-sphenoid | 800 | 1,000 | 1,000 | 1,200 | 1,200 | 1,400 | 1,400 | 1,400 |
| Basi-occipital | 600 | 1,000 | 1,000 | 1,400 | 1,400 | 1,400 | 1,400 | 1,400 |
| Mandible | 1,000 | 2,000 | 2,000 | 2,400 | 2,400 | 2,400 | 2,400 | 2,400 |
