Here is an example on how to find DICOM files of a particular modality (requires fgrep):
dcmdump -M +fo +Fs +sd +r /share/dicom/images/ +P Modality -q | fgrep -B1 "[OP]"
In this case, DICOM images with a modality value of “OP” (Ophthalmic Photography) are searched.
Note: Please note that some of the above used dcmdump options are not available for DCMTK releases prior to 3.6.0.
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