E: Implementation Class UID is an invalid UID

Description

Trying to perform a C-Echo on a PACS server and this error returns ValueError: Implementation Class UID is an invalid UID

Expected behaviour

What you expected to happen, (including references to the DICOM standard is appreciated).

Is should receive the dicom echo back. I believe that the Implementation Class is Valid as it meets the criteria here : http://dicom.nema.org/medical/dicom/2016d/output/chtml/part07/sect_D.3.3.2.html https://www.medicalconnections.co.uk/kb/ImplementationUID-And-ImplementationName/

I note that this works successfully in for the dcm4che dicom java toolkit but not for python pydicom/pynetdicom toolkit

Actual behaviour

What actually happened. If an exception occurred please post the full traceback.

I can see that the server returns the C-Echo but the python raises a value error

This the the returned UID that is raised as invalid: Implementation UID: “1.2.124.113532.3320”

Exception in thread Thread-8: Traceback (most recent call last): File “C:\Users\xxxxxxx\AppData\Local\Continuum\anaconda3\lib\threading.py”, line 916, in _bootstrap_inner self.run() File “C:\Users\xxxxxxx\AppData\Local\Continuum\anaconda3\lib\site-packages\pynetdicom3-0.9.0-py3.6.egg\pynetdicom3\dul.py”, line 245, in run if self._is_transport_event() and self._idle_timer is not None: File “C:\Users\xxxxxxx\AppData\Local\Continuum\anaconda3\lib\site-packages\pynetdicom3-0.9.0-py3.6.egg\pynetdicom3\dul.py”, line 466, in _is_transport_event self._check_incoming_pdu() File “C:\Users\xxxxxxx\AppData\Local\Continuum\anaconda3\lib\site-packages\pynetdicom3-0.9.0-py3.6.egg\pynetdicom3\dul.py”, line 369, in _check_incoming_pdu self.primitive = self.pdu.to_primitive() File “C:\Users\xxxxxxx\AppData\Local\Continuum\anaconda3\lib\site-packages\pynetdicom3-0.9.0-py3.6.egg\pynetdicom3\pdu.py”, line 899, in to_primitive primitive.user_information = item.to_primitive() File “C:\Users\xxxxxxx\AppData\Local\Continuum\anaconda3\lib\site-packages\pynetdicom3-0.9.0-py3.6.egg\pynetdicom3\pdu_items.py”, line 1085, in to_primitive primitive.append(item.to_primitive()) File “C:\Users\xxxxxxx\AppData\Local\Continuum\anaconda3\lib\site-packages\pynetdicom3-0.9.0-py3.6.egg\pynetdicom3\pdu_items.py”, line 1778, in to_primitive primitive.implementation_class_uid = self.implementation_class_uid File “C:\Users\xxxxxxx\AppData\Local\Continuum\anaconda3\lib\site-packages\pynetdicom3-0.9.0-py3.6.egg\pynetdicom3\pdu_primitives.py”, line 1153, in implementation_class_uid raise ValueError(“Implementation Class UID is an invalid UID”) ValueError: Implementation Class UID is an invalid UID

Steps to reproduce

How to reproduce the issue. Please include a minimum working code sample and the anonymised DICOM dataset (if relevant).

Snippet from the server

A 2018.11.21 13:01:39.179 (0x14c0) Calling Title: "QEDRP3 " A 2018.11.21 13:01:39.180 (0x14c0) Application Context: “1.2.840.10008.3.1.1.1” “Dicom Application Context Name” A 2018.11.21 13:01:39.180 (0x14c0) Presentation RQ Context ID: 1 A 2018.11.21 13:01:39.181 (0x14c0) Abstract Syntax Name: “1.2.840.10008.1.1” “Verification” A 2018.11.21 13:01:39.181 (0x14c0) Transfer Syntax Name: “1.2.840.10008.1.2” “Little Endian” A 2018.11.21 13:01:39.181 (0x14c0) Transfer Syntax Name: “1.2.840.10008.1.2.1” “Little Endian Explicit” A 2018.11.21 13:01:39.181 (0x14c0) Transfer Syntax Name: “1.2.840.10008.1.2.2” “Big Endian Explicit” A 2018.11.21 13:01:39.182 (0x14c0) User Information Structure: A 2018.11.21 13:01:39.182 (0x14c0) Maximum length: 16382 A 2018.11.21 13:01:39.182 (0x14c0) Implementation UID: “1.2.826.0.1.3680043.9.3811.0.9.1” A 2018.11.21 13:01:39.183 (0x14c0) Implementation Version Name: “PYNETDICOM3_091” A 2018.11.21 13:01:39.205 (0x14c0) Printout of response association. A 2018.11.21 13:01:39.205 (0x14c0) Protocol Version: “1” A 2018.11.21 13:01:39.206 (0x14c0) Called Title: "ANY-SCP " A 2018.11.21 13:01:39.206 (0x14c0) Calling Title: "QEDRP3 " A 2018.11.21 13:01:39.206 (0x14c0) Application Context: “1.2.840.10008.3.1.1.1” “Dicom Application Context Name” A 2018.11.21 13:01:39.210 (0x14c0) Presentation AC Context ID: 1 A 2018.11.21 13:01:39.210 (0x14c0) Result: 0 “Acceptance” A 2018.11.21 13:01:39.210 (0x14c0) Transfer Syntax Name: “1.2.840.10008.1.2” “Little Endian” A 2018.11.21 13:01:39.210 (0x14c0) User Information Structure: A 2018.11.21 13:01:39.211 (0x14c0) Maximum length: 100000 A 2018.11.21 13:01:39.211 (0x14c0) Implementation UID: “1.2.124.113532.3320” A 2018.11.21 13:01:39.211 (0x14c0) Implementation Version Name: “BROKER992.0” E 2018.11.21 13:03:28.818 (0x14c0) dicom_accepter_class::main: error occured while receiving dicom object

Your environment

Please run the following and paste the output.

$ python -c "import platform; print(platform.platform())"
$ python -c "import sys; print('Python', sys.version)"
$ python -c "import pydicom; print('pydicom', pydicom.__version__)"
$ python -c "import pynetdicom3; print('pynetdicom3', pynetdicom3.__version__)"


Windows-7-6.1.7601-SP1
Python 3.6.6. !Anaconda custom (64-bit)|,<default, Jun 28 2018, 11:27:44> [MSC v. 1900 64 bit <AMD64>]
pydicom 1.3.0.dev0
pynetdicom3 0.9.1

[scaramallion]

Ok, that’s great, I’ll close the issue.

Thanks for your help.

[scaramallion]

So the Implementation Class UID section is:

52 00 00 14 31 2e 32 2e 31 32 34 2e 31 31 33 35 33 32 2e 33 33 32 30 00

Item type: 0x52 Reserved: 0x00 Item length: 0x00 0x14 (20) Implementation class UID: everything else

It looks like the UID’s trailing padding character 0x00 isn’t being removed correctly by pynetdicom.