The HU of Common Substances
The Hounsfield scale applies to medical grade CT scans but not to cone beam computed tomography (CBCT) scans.
| Substance | HU |
|---|---|
| Air | −1000 |
| Lung | −700 |
| Fat | −84 |
| Water | 0 |
| CSF | 15 |
| Blood | +30 to +45 |
| Muscle | +40 |
| Soft Tissue | +100 to +300 |
| Bone | +700(cancellous bone)to +3000 (dense bone) |
A practical application of this is in evaluation of tumors, where, for example, an adrenal tumor with a radiodensity of less than 10 HU is rather fatty in composition and almost certainly a benign adrenal adenoma.
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