CT Dicom to mat HU display problem

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Dan Smith 2018-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/432200-ct-dicom-to-mat-hu-display-problem

评论： Rik 2018-11-27

I ran CERR on CT dicom files to create one mat file that has a variable planC containing the image data. I then took planC (a 1x25 cell) with code imagesc(CTimgmat(:,:,200)) to display the image and compared the x,y,index position/value to that which is displayed for the dicom images in OSIRIX or any other viewer that displays the pixels in HU units. The two didn't match up by about a thousand but it differs pixel to pixel. My goal is to run imagesc(CTimgmat(:,:,"slice#")) and have index # display as HU. Can anyone help?

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Rik 2018-11-27

Did your conversion take the slope and intercept in the dicom info into account?

Rik 2018-11-27

Comment posted as answer:

I've tried multiple solutions listed below, but nothing ever matches up to the HU listed in Osirix

https://www.mathworks.com/matlabcentral/answers/430900-how-can-i-change-a-pixel-value-of-a-ct-image-series-to-display-hu

https://github.com/cerr/CERR/issues/212

The people on github seem experienced with both CERR and Matlab, so I suspect the best course of action is to continue on that thread. I don't know why it would match up with OsiriX if you are using the dicom fields to convert to HU.

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