Copy Header Tags on copy DcmDataset

[focus]

Hello,

I would like to now if there is a way to copy from DcmDataset with pixeldata only the Dicom Header Data.

We have a DcmDataset

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DcmDataset dataset1;

dataset1 is a DcmDataset with pixel data, then using the constructor of DcmDataset we copy dataset1 object

Dcmdataset dataset2 = DcmDatset(dataset1);

In dataset2 we only need the dicom data header no the pixel data.

To save memory there is a way to make a copy of dcmdataset1 without pixel data ?

Thanks.

[Michael Onken]

Hi,

there is no copy constructor which permits not to copy pixel data; also note that there may be other elements besides pixel data (like overlays, LUT data, ...) which may be larger than "normal" elements.

What you can do before performing the copy: Remove the pixel data (but not delete it, copy the dataset and re-insert the pixel data. Something like this:

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DcmElement* rememberPixelData = dataset->remove(DCM_PixelData);
if (elem == NULL)
  return EC_IllegalCall; // no pixel data in dataset?!

DcmDataset* copyWithoutPixelData= new DcmDataset(dataset);
if (copyWithoutPixelData == NULL)
  return EC_MemoryExhausted; // not enough memory?

OFCondition result = dataset->insert(rememberPixelData);
if (result.bad())
  return EC_IllegalCall; // something went wrong...

I did not test that so there may be typos but I think the approach should work.

Best regards,
Michael