dcmdump and naming of raw file

[gnchen]

Hi!

Can anyone tell me how dcmdump create the file name whne I use +W option?

It seems it is always like:

dcmfilename.0.raw

Is it correct?

I will like dump pixel data to a file or pipe it throught stand output. So, I can easily read them in my python script. Any alternative way to achieve this is also welcomed...


Gen

[Marco Eichelberg]

For an uncompressed image, the filename is always dcmfilename.0.raw. For a compressed image, where PixelData essentially is a sequence with multiple item, each item is written to a separate file named dcmfilename.0.raw, dcmfilename.1.raw etc.

[gnchen]

Thanks!

Is there any DICOm tag indicating the image is compressed? And How many items I will get from that??

Gen

[Alexander Fedotov]

[quote="gnchen"]
Is there any DICOm tag indicating the image is compressed?
[/quote]

In a file?
Transfer Syntax UID (0002,0010)

[quote="gnchen"]
And How many items I will get from that??
[/quote]

What do you mean by "items"?

[gnchen]

Items refer to what Marco described in the previous response, i.e. how many slices in that multi-frame pixel data? Any dicom tag for this kind of info?? Sometimes, I really feel quite troubling that there is no any info regarding how many slices in a series and how many seires in this study.
Lacking of these kind of info just make the design of post processing steps miserable...

Gen

[Marco Eichelberg]

The transfer syntax in which the dataset is encoded determines whether or not pixel data on main dataset level will be encapsulated. DcmDataset::getOriginalgetOriginalXfer() will provide this transfer syntax and DcmXfer::isEncapsulated() will check whether this is one with encapsulated pixel data. The code might look like this:

Code: Select all

DcmXfer xfer (dataset->getOriginalgetOriginalXfer());
bool isEncapsulated = xfer.isEncapsulated();

If the pixel data is encapsulated, DcmPixelData::getEncapsulatedRepresentation() provides access to the sequence like structure (a DcmPixelSequence instance). Use DcmPixelData::getOriginalRepresentationKey() to retrieve the other parameters expected by DcmPixelData::getEncapsulatedRepresentation(). Within the DcmPixelSequence object finally, the number of sequence items can be determined with DcmPixelSequence::card().