Tag: Hounsfield

Hounsfield Units

Hounsfield Units (HU) are used in CT images it is a measure of radio-density, calibrated to distilled water and free air. HUs can be calculated from the pixel data with a Dicom Image via two methods. The first (and harder) method involves using the Slope and Intercept value from the Dicom image and applying it to a target pixel. HU=m*P+b where: m is the Dicom attribute (0028,1053) “Rescale slope” b is the Dicom attribute (0028,1052) “Rescale intercept” P is the value of that particular pixel in the pixels array.

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