CT Technology: HU Chart
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HU for fat
-100 to -50
HU for air
-1000
HU for lungs
-500
HU for water
0
HU for muscle
10 to 40
HU for soft tissue, contrast
100 to 300
HU for CSF
15
HU for white matter
20 to 30
HU for kidneys
30
HU for blood
30 to 45
HU for gray matter
37 to 45
HU for liver
40 to 60
HU for bone
700 (cancellous - aka spongy bone) to 3000 (dense bone)
Which of the following has the highest HU? • Calcified Pineal Gland • Cyst • Pneumothorax • Normal Liver
Calcified pineal gland (calcium is dense like bone)
Which of the following has the lowest HU? • Calcified Pineal Gland • Cyst • Pneumothorax • Normal Liver
Pneumothorax (pneumothorax has air & air is -1000 HU)
