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

Groups: Registered
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");
ds.SetStringValue(1);

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

000D,2001,?=1684234849

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

000D,2001,?=abcde

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)

GregR  
GregR

Groups: Registered, Tech Support, Administrators
Posts: 766


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)
zorik_novadaq

Groups: Registered
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 14.5.0.002 (or 14.5.0.2)
File Attachment(s):
DicomExport.zip (3kb) downloaded 33 time(s).
 
#4 Posted : Sunday, March 9, 2008 6:53:13 AM(UTC)

Adnan Ismail  
Guest

Groups: Guests
Posts: 3,034

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

Because
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.
The
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.

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

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