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#1 Posted : Thursday, March 6, 2008 7:26:33 AM(UTC)

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Posts: 9

I'm trying to insert a new private tag by the following:

ds.InsertTag((int)0x000D2001, -1, "Study Status", (short)LTDICLib.DicomVRCodeConstants.VR_OB, 1, 1, 1);

ds.InsertElement(false, (int)0x000D2001,
(short)LTDICLib.DicomVRCodeConstants.VR_CS, false, 0);

ds.StringValueCount = 1;
ds.set_StringValues(0, "abcd");

However when viewing the generated DICOM file in ezDicom I see the following:


But if I change the value I'm trying to insert from "abcd" to "abcde" I see the following:


Why I cannot see the "abcd" in the first attempt ?

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#2 Posted : Thursday, March 6, 2008 10:31:16 AM(UTC)


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Posts: 764

Which LEADTOOLS version and interface (COM, API, etc.) are you using?

What happens if you load the Dicom File in the C++ CLIB Main Dicom demo rather than ezDicom?  Is the tag still 1684234849 rather than abcd?  If so, then most likely there's a problem with ezDicom.

What is the file version of ltkrn##*.dll that you're using?

Could you post the two DICOM files (one with abcd and other with abcde)?

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#3 Posted : Thursday, March 6, 2008 11:12:05 AM(UTC)

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Posts: 9

I'm using the COM interface.
I tried to load both DICOM files using your .NET Dicom demo. In both cases I saw the tag without any value.

The version of the ltkrn14N.dll is (or
File Attachment(s):
DicomExport.zip (3kb) downloaded 41 time(s).
#4 Posted : Sunday, March 9, 2008 6:53:13 AM(UTC)

Adnan Ismail  

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Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

this is a private tag, a DICOM viewer that doesn't know what it is might not format the value properly when it displays the contents.
value 'abcd' contains 4 bytes, which can be understood as either one 32-bit
integer, or 4 characters. In fact, the hex values of the ASCII codes of these 4 letters are 0x61, 0x62, 0x63 and 0x64.
If you
combine them into one hex number, 0x64636261, its decimal value is 1684234849, which is the number you got last time.

when a fifth byte was added, the viewer determined it's not a 32-bit number, so it displayed them as character bytes.

general, whenever you insert a private tag, it is your responsibility to ensure your own viewer handles it correctly.
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