Dicom SCP error printer

[Marconi Edson Pereira Leite Filho]

Good Morning,

Can someone help me with the error below?

The error is only caused when the images are sent from the Carestream Pacs:

Exception processing P-Data-TF PDU: System.NullReferenceException: Object reference not set to an instance of an object.

[Anders Gustafsson Cureos AB]

Good morning Marconi,

have you built Print SCP from the latest commit in fo-dicom-samples, here: https://github.com/fo-dicom/fo-dicom-samples ?

As an alternative, you might want to try the pre-built binary located here: https://github.com/fo-dicom/fo-dicom-samples/releases/tag/2017.01

Regards,

Anders @ Cureos

[Anders Gustafsson Cureos AB]

If it still fails with the latest commit or the pre-built binary, please provide the entire log from the Print SCP.

[Marconi Edson Pereira Leite Filho]

Good afternoon

I used the example of the links above, and still the error persists.

Below is the complete error log.

srvpacsMP <- Association request:

Calling AE Title:       srvpacsMP

Called AE Title:        MarselhesaPB

Remote host:            10.20.0.31

Remote port:            51831

Implementation Class:   Implementation Class UID [1.2.840.113704.7.0.2]

Implementation Version: DCM Pro-11.4.1.0

Maximum PDU Length:     32768

Async Ops Invoked:      1

Async Ops Performed:    1

Presentation Contexts:  3

  Presentation Context:  1 [Proposed]

       Abstract Syntax:  Basic Grayscale Print Management Meta SOP Class

       Transfer Syntax:  Explicit VR Little Endian

       Transfer Syntax:  Explicit VR Big Endian (Retired)

       Transfer Syntax:  Implicit VR Little Endian: Default Transfer Syntax for DICOM

  Presentation Context:  3 [Proposed]

       Abstract Syntax:  Print Job SOP Class

       Transfer Syntax:  Explicit VR Little Endian

       Transfer Syntax:  Explicit VR Big Endian (Retired)

       Transfer Syntax:  Implicit VR Little Endian: Default Transfer Syntax for DICOM

  Presentation Context:  5 [Proposed]

       Abstract Syntax:  Unknown [1.2.840.113704.7.0.1.14]

       Transfer Syntax:  Explicit VR Little Endian

       Transfer Syntax:  Explicit VR Big Endian (Retired)

       Transfer Syntax:  Implicit VR Little Endian: Default Transfer Syntax for DICOM

Received association request from AE: srvpacsMP with IP: 127.0.0.1 

Requested abstract syntax Unknown [1.2.840.113704.7.0.1.14] from srvpacsMP not supported

Accepted association request from srvpacsMP

srvpacsMP -> Association accept:

Calling AE Title:       srvpacsMP

Called AE Title:        MarselhesaPB

Remote host:            10.20.0.31

Remote port:            51831

Implementation Class:   Implementation Class UID [1.2.840.113704.7.0.2]

Implementation Version: DCM Pro-11.4.1.0

Maximum PDU Length:     32768

Async Ops Invoked:      1

Async Ops Performed:    1

Presentation Contexts:  3

  Presentation Context:  1 [Accept]

       Abstract Syntax:  Basic Grayscale Print Management Meta SOP Class

       Transfer Syntax:  Explicit VR Little Endian

  Presentation Context:  3 [Accept]

       Abstract Syntax:  Print Job SOP Class

       Transfer Syntax:  Explicit VR Little Endian

  Presentation Context:  5 [RejectAbstractSyntaxNotSupported]

       Abstract Syntax:  Unknown [1.2.840.113704.7.0.1.14]

       Transfer Syntax:  Explicit VR Little Endian

srvpacsMP <- N-Create request [3]

Create new film session 2.25.6895136659919589539815936711052079665

Exception processing P-Data-TF PDU: System.NullReferenceException: Object reference not set to an instance of an object.

   at Dicom.DicomUniqueIdentifier.<>c.<.ctor>b__1_0(DicomUID x)

   at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()

   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)

   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)

   at Dicom.DicomUniqueIdentifier..ctor(DicomTag tag, DicomUID[] values)

   at Dicom.DicomDataset.DoAdd[T](DicomVR vr, DicomTag tag, IList`1 values, Boolean allowUpdate)

   at Dicom.DicomDataset.DoAdd[T](DicomTag tag, IList`1 values, Boolean allowUpdate)

   at Dicom.Network.DicomNCreateResponse.set_SOPInstanceUID(DicomUID value)

   at DiconPrint.PrintSCP.PrintService.CreateFilmSession(DicomNCreateRequest request)

   at DiconPrint.PrintSCP.PrintService.OnNCreateRequest(DicomNCreateRequest request)

   at Dicom.Network.DicomService.PerformDimse(DicomMessage dimse)

   at Dicom.Network.DicomService.<ProcessPDataTFAsync>d__55.MoveNext()

Connection closed

[Marconi Edson Pereira Leite Filho]

I captured an error image in debug mode.

I think it may be in the "Mediun Type" tag that it is empty.

[Anders Gustafsson Cureos AB]

Hello again Marconi,

there is evidently an issue in the DicomNCreateResponse constructor; it does not account for the fact that the Affected SOP Instance UID in the N-CREATE request can be undefined. 

I will post an issue about this in the Github repository and try to provide a fix as soon as possible. In the mean time, in the PRINT SCP sample, you could try to set a dummy UID value to the request before calling the DicomNCreateResponse constructor, e.g.

request.SOPInstanceUID = DicomUIDGenerator.GenerateDerivedFromUUID();

Many thanks for making me aware of this issue!

Best regards,

Anders @ Cureos

[Fellipe Pinheiro]

Hello Anders.

I'm a friend of Marconi.

It is not possible to set the request.SOPInstanceUID property because it is read-only.

[Anders Gustafsson Cureos AB]

Ah, you're right! I am sorry, I forgot that. What I think you should be able to do is to update the request command directly, like this:

request.Command.Add(DicomTag.AffectedSOPInstanceUID, DicomUIDGenerator.GenerateDerivedFromUUID());

Hope this works!

Anyway, I have made a bug fix in the fo-dicom repository and scheduled it to be included in version 3.0.2, which should be released within the next couple of weeks.Then the problem should go away regardless.

Best regards,

Anders

[Anders Gustafsson Cureos AB]

BTW, to ensure that this change does not throw in those case where the request already contains an Affected SOP Instance UID, you might want to use AddOrUpdate instead:

request.Command.AddOrUpdate(DicomTag.AffectedSOPInstanceUID, DicomUIDGenerator.GenerateDerivedFromUUID());