MATLAB: Dicomread a File and Dicomwrite it results in different outputs…

dicom

I have a very weird problem.

I open a DicomFile and save it without changing a thing, but when I look at the dcm in synedra view, they are different.

The original files goes from -4096 to 4096 but the save file only from 0 to 4096. I then tried to stretch the file by myself i.o.:

x = (2.*x-4096);

But this was also not working, dicomwrite cuts the values below 0…

dinfo = dicominfo('testDicom.dcm');

x = dicomread(dinfo);

dicomwrite(x, 'testDicom2.dcm', dinfo)

Any ideas?

Best Ingo

Okay, I solved the problem!

If I would have read the manual carefully I have to use the option ( 'CreateMode', 'copy' ):

dicomwrite(x, 'testDicom2.dcm', dinfo 'CreateMode', 'copy');

Thanks for your help again and best wishes

Ingo

I don't know a lot about DICOM images, but a possibility is to use

 dicomread
 imresize
 dicomwrite

in that order.

For changing a particular header in the metadata without losing any headers, set the 'CreateMode' parameter to 'copy'.

For example, if someone wants to change 'ImageType' header to ORIGINAL/PRIMARY to DERIVED/SECONDARY in 'new.dcm' file, the following code might help:

h = dicominfo('new.dcm');
X = dicomread('new.dcm');
dicomwrite(X, 'newdcm', h, 'CreateMode', 'copy','ImageType', 'ORIGINAL\PRIMARY');