how to calculation Hounsfield unit
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Jhilam Mukherjee
on 29 Jan 2014
Commented: Walter Roberson
on 20 Feb 2018
I want to calculate Hounsfield Unit of a CT image, Please provide me the syntax
1 Comment
EVA Gallego Camuñas
on 27 Feb 2014
Hello Jhilam,
I also need to calculate Hounsfield Unit of an image. I have some grey images and their histograms and I need to relate the peaks of the histograms with the Hounsfield unit.
Did you find out how to calculate that? I would be very grateful if you could help me.
Thank you.
Accepted Answer
Shawn Moyer
on 11 Mar 2014
Edited: Shawn Moyer
on 11 Mar 2014
Hounsfield units can be calculated using DICOM metadata:
Pixel value in Hounsfield units = m*SV+b
where:
Note that Hounsfield units are the default unit when tag (0028, 1054) is absent.
References:
2 Comments
mohd akmal masud
on 20 Feb 2018
Just to confirm, the equation that you give, d is rescale intercept, and m is the rescale slope.
But according to your link given, https://www.medicalconnections.co.uk/kb/Hounsfield_Units, HU = m * P + b, its show that b is rescale slope and P is rescale intercept. its look like contradictory.
Which one true?
Walter Roberson
on 20 Feb 2018
The site says,
"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."
The only way that can be meaningfully understood is
"where: [m is the Dicom attribute number (0028,1053) whose name is "Rescale slope"] and [b is the Dicom attribute number (0028,1052) whose name is "Rescale intercept"] and [P is the value of that particular pixel in the pixels array]."
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