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CT numbers = Hounsfield units

The grey tones on the CT image represent the

attenuation in every pixel/voxel

The grey tones are expressed in Hounsfield units (HU)

– CT numbers:

μ

obj

– μ

water

HU = –––––––– x 1000

μ

water

Luft ~ -1000 HU

Vand ~0 HU

Knogler >1000 HU