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Hounsfield unit
HU = 19.42 HU
H
U
=
1000
μ
−
μ
w
μ
w
\mathrm{HU}=1000\frac{\mu-\mu_w}{\mu_w}
HU
=
1000
μ
w
μ
−
μ
w
CT number from linear attenuation relative to water.
Laser