Wildcards in DICOM tag statements

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Marcel Daamen

Aug 25, 2020, 1:06:37 PM8/25/20
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maybe I missed this in the documentation: Is there a possibility in pydicom to address tag elements in a wildcard fashion? 

Practical example: The Philips Save Private Attributes declaration defines the SUV factor tag as (7053,xx00). While I currently only know data using (7053,1000), it would like to prepare for the possibility of deviating cases.

Thanks in advance...

Best wishes,


Darcy Mason

Aug 27, 2020, 9:45:07 AM8/27/20
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Hi Marcel,

You could start with using Dataset's group_dataset method to return the data elements in the 7053 group.  Then iterate through that group dataset using a FF mask with python binary AND ("&" operator) (untested, `data_elem.tag & 0xFF == 0`) to find the ones that are an exact match to the xx00. There are similar methods to deal with what pydicom calls "repeaters" near the top of datadict.py, although likely a little more complex there than what you need as it is generalized for the "x"'s in any location.

Also, you could look at the private data element handling built into pydicom, which could also be helpful to navigate these more elegantly.

Hope that helps,

Marcel Daamen

Aug 27, 2020, 4:38:03 PM8/27/20
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Hi Darcy,

thanks a lot for your helpful suggestion.

I was exactly seeking for this FF mask option. Actually, the combined expression...

((data_element.tag.group == 0x7053) & (data_element.tag & 0xFF == 0))

... seems to produce the behavior I need in my script.

Best wishes,


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