Table 1 HU value in parts of the body.

From: Automatic detect lung node with deep learning in segmentation and imbalance data labeling

Substance

HU

Air

−1000

Fat

−120 to 90

Soft tissue on contrast CT

+100 to +300

Lung

−700 to −600

Bone

+300 to +400

+1800 to +1900

Water

0