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suever / pydicom-experimental

pydicom test
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ECG - WaveformData #105

Open suever opened 9 years ago

suever commented 9 years ago

From andrehal...@lpds.ufsc.br on September 02, 2011 20:37:18

What steps will reproduce the problem? 1.Open ecg dicom file 2.Read WaveformData tag (inside Waveforms tag) What is the expected output? What do you see instead? It should be reading it as a (very long) string representing the ecg exams, however, for some files, it reads as a list of strings. I tried merging the list of string, but them the data is incorrect (as if it read wrongly part of it). I tried in Matlab and it works fine, I am able to read the ecg wave

This website has some ecg dicom files, I teste with the 3 first ones, and all of them gave this incorrect output: http://www.excel-medical.com/waveforms/Waveform.htm What version of the product are you using? I am using version 0.9.5

Original issue: http://code.google.com/p/pydicom/issues/detail?id=105

suever commented 9 years ago

From andrehal...@lpds.ufsc.br on September 02, 2011 17:45:39

Actually, the first image (12 lead ECG) does work, however, the subsequent ones don't

suever commented 9 years ago

From darcymason@gmail.com on September 07, 2011 18:14:17

Thanks for the detailed issue and example files. I've downloaded two of the files and started looking into it.

Status: Accepted

suever commented 9 years ago

From andrehal...@lpds.ufsc.br on September 08, 2011 14:26:05

So... I found a workaround, but it is still an issue. PyDicom is interpreting the byte array from the dicom file as a string. However, everytime there is a "backslash" character it splits the string in 2. The final solution would be to make PyDicom understand that these "backslash" are just characters, not a new string command.

The workaround I did was to rejoin all the strings inserting "backslash" between them.

suever commented 9 years ago

From darcymason@gmail.com on September 11, 2011 19:02:05

I can't seem to reproduce this problem. I've tried five of the files and for me, ds.Waveforms[0].WaveformData is always a string (not split). Tried it on Mac with python 2.7 64-bit, and on Windows with python 2.6, 32-bit, both with pydicom 0.9.5 and the latest repository code.

The backslash character is supposed to split items for certain VRs, and not for others, so the kind of problem is something that could easily happen. Is there any kind of processing you are doing that might be triggering this?