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Topic: How to get HU values from CT image
Replies: 3   Last Post: Sep 17, 2012 8:13 PM

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Jeff

Posts: 74
Registered: 3/2/11
Re: How to get HU values from CT image
Posted: Sep 17, 2012 8:13 PM
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Manoj,

I believe what you need to do is to convert the displayed/generated pixel values, which are greyscale values, into the corresponding Hounsfield Unit (HU). To do this you use the following equation:

HU = pixel_value*slope - intercept

The intercept is found in the dicom header at 0028,1052 and the slope at 0028,1053. Plug these into the equation and you obtain the HU value which is simply a rescaling of the linear attenuation coefficient.



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