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dicomwrite error in copying metadata: "Undefined function 'fieldnames' for input arguments of type 'uint8'."

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Sangeetha on 24 Feb 2015
I'm trying to modify the metadata of a DICOM file and copy ALL the fields over to a new file. The default dicomwrite does not copy all the fields. I tried to use 'createmode','copy' and I get the following error: Undefined function 'fieldnames' for input arguments of type 'uint8'.
The DICOM dictionary has all the fields I need to copy over, so thats not the issue! Any help would be greatly appreciated. My code is below:
X=dicomread(filename); hdr.PatientName=subjid;
%% Using dicomwrite(X,'file_copy.dcm',hdr) successfully copies, but leaves some fields out in the metadata.

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