Problem with a dicom service and the c-find operation

[Andreas Auderer]

Hello,

 

i have a question regarding the c-find Operation in the fellow oak dicom. I have developed a Service wich implements a c-find operation and should send the found patients back tot he ultrasound machine. I’m testing currently with the 4d view “emulator” from GE.

 

I’ve implemented the code like I found on this forum and its receiving the request. I send back a dataset but everytime I get on the ultrasound machine the message that no items could be found. L

 

May anyone of you can help me?

 

Thanks in advance

Andreas

using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
namespace Server
{
 [CLSCompliant(false)]
 public class CFind : DicomServiceBase, IDicomCFindProvider
 {

  private static readonly DicomTag PatientNumberTag = new DicomTag(0x10, 0x20);

  private static readonly DicomTag PatientNameTag = new DicomTag(0x10, 0x10);
  public CFind() : base(null, null)
  {
  }

  public CFind(System.IO.Stream stream, global::Dicom.Log.Logger log) : base(stream, log)
  {
  }

  public IEnumerable<global::Dicom.Network.DicomCFindResponse> OnCFindRequest(global::Dicom.Network.DicomCFindRequest request)
  {
   Logging.Trace(CurrentLogger, "C-Find request");
   string familyname = "";
   int? patientId = default(int?);

   if (request.Dataset.Contains(PatientNumberTag)) {
    DicomLongString dicomLongStringItem = request.Dataset.Get<DicomLongString>(PatientNumberTag);
    if (Information.IsNumeric(dicomLongStringItem.Value))
     patientId = dicomLongStringItem.Value;
   }
   if (request.Dataset.Contains(PatientNameTag)) {
    DicomPersonName dicomPersonNameItem = request.Dataset.Get<DicomPersonName>(PatientNameTag);
    if (!string.IsNullOrEmpty(dicomPersonNameItem.Last) && dicomPersonNameItem.Last != "*")
     familyname = dicomPersonNameItem.Last;
   }

   List<DicomCFindResponse> responses = new List<DicomCFindResponse>();
   if (request.Level == DicomQueryRetrieveLevel.Patient) {
    foreach (DicomDataset result in getworklistresults()) {
     result.Add(DicomTag.QueryRetrieveLevel, request.Level);
     result.Add(DicomTag.RetrieveAETitle, CalledAe);
     DicomCFindResponse response = new DicomCFindResponse(request, DicomStatus.Success);
     response.Dataset = result;
     responses.Add(response);
    }
   }
   responses.Add(new DicomCFindResponse(request, DicomStatus.Success));
   return responses;

  }

  private List<DicomDataset> getworklistresults()
  {
   DicomDataset ds = new DicomDataset();
   ds.Add(new DicomPersonName(DicomTag.PatientName, DicomEncoding.GetEncoding("ISO 2022 IR 100"), "name^surname"));
   ds.Add(DicomTag.PatientID, "rtrtrtrtrt");
   ds.Add(DicomTag.PatientBirthName, "errerere");
   ds.Add(DicomTag.RetrieveAETitle, this.CalledAe);
   List<DicomDataset> a = new List<DicomDataset>();
   a.Add(ds);
   return a;
  }
 }
}

[Hesham Desouky]

Hello,

From my experience the modality will not display the returned results as long as it didn't contains the attributes it requested through the C-FIND request.

You should look into the request dataset to find which DICOM attributes the modality is requesting and populate these fields with results.

if you have any requested attributes with no match from your SCP add it empty to the result response dataset.

To understand how it works you can read the following

http://dicomiseasy.blogspot.com/2012/01/dicom-queryretrieve-part-i.html

or for more details go ahead for the standard:

http://medical.nema.org/dicom/2004/04_04PU.PDF

I hope the above lighten things up for you

[Andreas Auderer]

Hello Hesham,

thanks for your response. i have looked into the request dataset and added all tags mentioned there. but it can't find patients in the 4d view app. Did you mean that? Heres my updated code:    Public Function OnCFindRequest(request As Global.Dicom.Network.DicomCFindRequest) As IEnumerable(Of Global.Dicom.Network.DicomCFindResponse) Implements Global.Dicom.Network.IDicomCFindProvider.OnCFindRequest         Logging.Trace(CurrentLogger, "C-Find request")         Dim familyname As String = ""         Dim patientId As Integer?         If request.Dataset.Contains(PatientNumberTag) Then             Dim dicomLongStringItem As DicomLongString = request.Dataset.Get(Of DicomLongString)(PatientNumberTag)             If IsNumeric(dicomLongStringItem.Value) Then patientId = dicomLongStringItem.Value         End If         If request.Dataset.Contains(PatientNameTag) Then             Dim dicomPersonNameItem As DicomPersonName = request.Dataset.Get(Of DicomPersonName)(PatientNameTag)             If Not String.IsNullOrEmpty(dicomPersonNameItem.Last) AndAlso dicomPersonNameItem.Last <> "*" Then familyname = dicomPersonNameItem.Last         End If         Dim responses As New List(Of DicomCFindResponse)()         If request.Level = DicomQueryRetrieveLevel.Patient Then             For Each result As DicomDataset In getworklistresults(request)                 Dim response As New DicomCFindResponse(request, DicomStatus.Pending)                 response.Dataset = result                 responses.Add(response)             Next         End If         responses.Add(New DicomCFindResponse(request, DicomStatus.Success))         Return responses     End Function     Private Function getworklistresults(request As Global.Dicom.Network.DicomCFindRequest) As List(Of DicomDataset)         Dim dicomdatasets As New DicomDataset()         dicomdatasets.Add(DicomTag.SpecificCharacterSet, "ISO_IR 100")         dicomdatasets.Add(DicomTag.AccessionNumber, "")         dicomdatasets.Add(DicomTag.ReferringPhysicianName, "")         Dim sequenceDatase0 = New DicomDataset         Dim sq0 As New DicomSequence(DicomTag.ReferencedStudySequence, sequenceDatase0)         dicomdatasets.Add(DicomTag.ReferencedStudySequence, sq0)         Dim sequenceDataset1 = New DicomDataset         Dim sq1 As New DicomSequence(DicomTag.ReferencedPatientSequence, sequenceDataset1)         dicomdatasets.Add(DicomTag.ReferencedPatientSequence, sq1)         dicomdatasets.Add(New DicomPersonName(DicomTag.PatientName, DicomEncoding.GetEncoding("ISO 2022 IR 100"), "name^surname"))         dicomdatasets.Add(DicomTag.PatientID, "12345")         dicomdatasets.Add(DicomTag.IssuerOfPatientID, "")         dicomdatasets.Add(DicomTag.PatientBirthDate, "")         dicomdatasets.Add(DicomTag.PatientSex, "F")         dicomdatasets.Add(DicomTag.PatientSize, "170")         dicomdatasets.Add(DicomTag.PatientWeight, "170")         dicomdatasets.Add(DicomTag.LastMenstrualDate, "")         dicomdatasets.Add(DicomTag.StudyInstanceUID, "")         dicomdatasets.Add(DicomTag.RequestingPhysician, "")         dicomdatasets.Add(DicomTag.RequestedProcedureDescription, "")         Dim sequenceDataset2 = New DicomDataset         Dim sq2 As New DicomSequence(DicomTag.RequestedProcedureCodeSequence, sequenceDataset2)         dicomdatasets.Add(DicomTag.RequestedProcedureCodeSequence, sq2)         dicomdatasets.Add(DicomTag.AdmissionID, "")         Dim sequenceDataset3 = New DicomDataset         Dim sq3 As New DicomSequence(DicomTag.ScheduledProcedureStepSequence, sequenceDataset3)         dicomdatasets.Add(DicomTag.ScheduledProcedureStepSequence, sq3)         dicomdatasets.Add(DicomTag.RequestedProcedureID, "")         dicomdatasets.Add(DicomTag.ReasonForTheRequestedProcedure, "")         Dim a As New List(Of DicomDataset)         a.Add(dicomdatasets)         Return a     End Function

[Hesham Desouky]

Check the 4d view application conformance statement. conformance statement will show you which fields are mandatory and can't have empty or no data.

For example, study instance UID can't be empty.

Not providing the mandatory attributes with data will be discarded by the requesting application. I saw this behavior with many modalities vendors like GE and Philips.

Hesham

[Andreas Auderer]

i've also send some study instance uid - but without succes

can you tell me how i will see this conformance statement?

thanks

Andreas

[Chris Horn]

Are you trying to get a work list ?
or c-find to another machine?

what are you trying to achieve, the conformance statement will tell you what the machine supports, the hardware vendor will be able to supply you a copy or google for the machine name and version should yeild results.
do you have any looging set up that may show more ?