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; Hounsfield unit is a unit used in medical imaging (MSCT ) to describe the amount of x-ray attenuation of each "voxel" in the 3D image. The voxels are normally represented as 12-bit binary numbers, and therefore have 212 = 4096 possible values. These values are arranged on a scale from -1024 HU to +3071 HU, calibrated so that -1024 HU is the attentuation produced by air and 0 HU is the attenuation produced by water.

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17y ago

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