[ITK-users] Slope intercept on DCMTK-ITK not working

[Williams, Norman K]

The way I used DCMTK to read the images, I thought I was using an interface that already applied slope/intercept.

If that isn’t the case, itkDCMTKImageIO needs to be fixed.  If you can supply a dataset illustrating the problem, I can work on that.

In the meantime, the only workaround I can suggest is to use the irk::DCMTKFileReader class to open the slices and recover the Slope/Intercept.  You can then use ITK filters to apply them after reading in the Image.


From: Jose Ignacio Prieto <joseignacio.prieto at gmail.com<mailto:joseignacio.prieto at gmail.com>>
Date: Tuesday, May 6, 2014 at 5:53 PM
To: Insight <insight-users at itk.org<mailto:insight-users at itk.org>>, Mushly McMushmaster <norman-k-williams at uiowa.edu<mailto:norman-k-williams at uiowa.edu>>
Subject: Slope intercept on DCMTK-ITK not working

Hi all,



This question is mainly aimed for Kent, but maybe somebody else knows too.

I am trying to load a 4D flow dataset acquired on a Phillips system. On the Z slices first there are the anatomical slices, time sorted (68 z slices on 25 time frames = 1700), and then are the per axis velocities (again 1700 slices).

So these image has two different slope-intercept functions, one for the anatomical and another for velocity. Using itkDCMTKImageIO and itkDCMTKFileReader there is no clue on where are this values read. Checking the output with an iterator I see that the slope and intercept are not considered at any time.

Is this something that DCMTK should do by itself? If I force it to look for it on itkDCMTKImageIO, what is the internal helper I should modify?




Thanks in advance for your help,

Ignacio Prieto

--
José Ignacio Prieto
Software Developer
Biomedical Imaging Center
Pontificia Universidad Catolica de Chile.


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