Posts by wdtj

wdtj · May 19th 2021

If we use just the command:

dgate -v

in the foreground and terminate it with just a SIGTERM, will that work as well?

wdtj · May 19th 2021

I am running Conquest under the wavedrift/conquest docker container. We've noticed that sometimes the docker container does not shut down cleanly. I think this is being caused by the fact that the container runs the daemon:

dgate -v

and when the docker controller sends a sigterm, the daemon does not shut down.

I tried running the daemon as a background process, and then calling:

dgate -v --quit

and

dgate -v --safequit

But neither seems to shut down the background process.

Anyone have any ideas?

wdtj · Dec 30th 2020

1.5.0b. Thanks.

wdtj · Dec 29th 2020

Thanks for the reply. From what I see in the examples from pynetdicom, the context is added to the AE object before the associate(). When the associate() is called, the Associate Request is sent (which includes the contexts). The peer then accepts or rejects the contexts. In the log I see the CTImageStorage context is requested and the peer approves the context on the response. I then do the C-GET and Conquest sends the Dicom file but apparently pynetdicom rejects the response saying the Context is not available.

I do also have a request out on StackExchange, hoping someone with pinetdicom experience might help. Since the pinetdicom examples SHOULD work, I was more interested here in seeing if there was some compatibility issue with ConQuest.

Thanks.

wdtj · Dec 28th 2020

I am trying to use pynetdicom for the first time. I have it and the ConQuest DICOM server installed on my PC. I am able to get the pynetdicom echo example working, but when I try the pynetdicom Storage SCU example (https://pydicom.github.io/pyne…ble/examples/storage.html) it fails with:

Code

No presentation context for 'CT Image Storage' has been accepted by the peer for the SCP role

Problem is, the example has negotiated the CT Image Storage context as far as I can see. Here's the logging from pynetDicom:

Code

pydev debugger: starting (pid: 39132)
I: Requesting Association
D: Request Parameters:
D: ======================= OUTGOING A-ASSOCIATE-RQ PDU ========================
D: Our Implementation Class UID:      1.2.826.0.1.3680043.9.3811.1.5.3
D: Our Implementation Version Name:   PYNETDICOM_153
D: Application Context Name:    1.2.840.10008.3.1.1.1
D: Calling Application Name:    PYNETDICOM      D: Called Application Name:     ANY-SCP         D: Our Max PDU Receive Size:    16382
D: Presentation Contexts:
D:   Context ID:        1 (Proposed)
D:     Abstract Syntax: =Patient Root Query/Retrieve Information Model - GET
D:     Proposed SCP/SCU Role: Default
D:     Proposed Transfer Syntaxes:
D:       =Implicit VR Little Endian
D:       =Explicit VR Little Endian
D:       =Deflated Explicit VR Little Endian
D:       =Explicit VR Big Endian
D:   Context ID:        3 (Proposed)
D:     Abstract Syntax: =CT Image Storage
D:     Proposed SCP/SCU Role: SCP
D:     Proposed Transfer Syntaxes:
D:       =Implicit VR Little Endian
D:       =Explicit VR Little Endian
D:       =Deflated Explicit VR Little Endian
D:       =Explicit VR Big Endian
D: Requested Extended Negotiation: None
D: Requested Common Extended Negotiation: None
D: Requested Asynchronous Operations Window Negotiation: None
D: Requested User Identity Negotiation: None
D: ========================== END A-ASSOCIATE-RQ PDU ==========================
D: Accept Parameters:
D: ======================= INCOMING A-ASSOCIATE-AC PDU ========================
D: Their Implementation Class UID:    1.2.826.0.1.3680043.2.135.1066.101
D: Their Implementation Version Name: 1.5.0/WIN32
D: Application Context Name:    1.2.840.10008.3.1.1.1
D: Calling Application Name:    PYNETDICOM      D: Called Application Name:     ANY-SCP         D: Their Max PDU Receive Size:  32768
D: Presentation Contexts:
D:   Context ID:        1 (Accepted)
D:     Abstract Syntax: =Patient Root Query/Retrieve Information Model - GET
D:     Accepted SCP/SCU Role: Default
D:     Accepted Transfer Syntax: =Implicit VR Little Endian
D:   Context ID:        3 (Accepted)
D:     Abstract Syntax: =CT Image Storage
D:     Accepted SCP/SCU Role: Default
D:     Accepted Transfer Syntax: =Implicit VR Little Endian
D: Accepted Extended Negotiation: None
D: Accepted Asynchronous Operations Window Negotiation: None
D: User Identity Negotiation Response: None
D: ========================== END A-ASSOCIATE-AC PDU ==========================
I: Association Accepted
I: Sending Get Request: MsgID 1
I: I: # Request Identifier
I: (0008,0052) CS [PATIENT]                                # 1 QueryRetrieveLevel
I: (0010,0010) PN [Wrench, Fred]                           # 1 PatientName
I: D: ========================== OUTGOING DIMSE MESSAGE ==========================
D: Message Type                  : C-GET RQ
D: Message ID                    : 1
D: Affected SOP Class UID        : Patient Root Query/Retrieve Information Model - GET
D: Identifier                    : Present
D: Priority                      : Low
D: ============================ END DIMSE MESSAGE =============================
D: pydicom.read_dataset() TransferSyntax="Little Endian Implicit"
I: Received Store Request
D: ========================== INCOMING DIMSE MESSAGE ==========================
D: Message Type                  : C-STORE RQ
D: Presentation Context ID       : 3
D: Message ID                    : 59647
D: Affected SOP Class UID        : CT Image Storage
D: Affected SOP Instance UID     : 1.3.6.1.4.1.33997.3232235894.19152.1608672548.1.1.1
D: Move Originator               : PYNETDICOM
D: Data Set                      : Present
D: Priority                      : Medium
D: ============================ END DIMSE MESSAGE =============================
E: No presentation context for 'CT Image Storage' has been accepted by the peer for the SCP role
D: pydicom.read_dataset() TransferSyntax="Little Endian Implicit"
D: ========================== INCOMING DIMSE MESSAGE ==========================
D: Message Type                  : C-GET RSP
D: Presentation Context ID       : 1
D: Message ID Being Responded To : 1
D: Affected SOP Class UID        : Patient Root Query/Retrieve Information Model - GET
D: Remaining Sub-operations      : 0
D: Completed Sub-operations      : 0
D: Failed Sub-operations         : 5
D: Warning Sub-operations        : 0
D: Identifier                    : None
D: Status                        : 0xFE00
D: ============================ END DIMSE MESSAGE =============================
D: I: Get SCP Result: 0xFE00 (Cancel)
I: Sub-Operations Remaining: 0, Completed: 0, Failed: 5, Warning: 0
D: pydicom.read_dataset() TransferSyntax="Little Endian Implicit"
C-GET query status: 0xfe00
I: Releasing Association

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So the log shows that the CT Image Storage Context was accepted, but with SCP/SCU Role: Default, whatever that means. When I debug through the pynetdicom processing I see that there is a CT context, but only for the SCP role.

ConQuest shows it's sent the DICOM file and then got disconnected.

And of course the code (only minor changes from the pynetdicom example:

Code

from pydicom.dataset import Dataset

from pynetdicom import AE, evt, build_role, debug_logger
from pynetdicom.sop_class import (    PatientRootQueryRetrieveInformationModelGet,    CTImageStorage
)

debug_logger()

# Implement the handler for evt.EVT_C_STORE
def handle_store(event):    """Handle a C-STORE request event."""    ds = event.dataset    ds.file_meta = event.file_meta
    # Save the dataset using the SOP Instance UID as the filename    ds.save_as(ds.SOPInstanceUID, write_like_original=False)
    # Return a 'Success' status    return 0x0000

handlers = [(evt.EVT_C_STORE, handle_store)]

# Initialise the Application Entity
ae = AE()

# Add the requested presentation contexts (QR SCU)
ae.add_requested_context(PatientRootQueryRetrieveInformationModelGet)
# Add the requested presentation context (Storage SCP)
ae.add_requested_context(CTImageStorage)

# Create an SCP/SCU Role Selection Negotiation item for CT Image Storage
role = build_role(CTImageStorage, scp_role=True)

# Create our Identifier (query) dataset
# We need to supply a Unique Key Attribute for each level above the
#   Query/Retrieve level
ds = Dataset()
ds.QueryRetrieveLevel = 'PATIENT'
ds.PatientName = 'Wrench, Fred'

# Associate with peer AE at IP 127.0.0.1 and port 11112
assoc = ae.associate('127.0.0.1', 5679, ext_neg=[role], evt_handlers=handlers)

if assoc.is_established:
    # Use the C-GET service to send the identifier
    responses = assoc.send_c_get(ds, PatientRootQueryRetrieveInformationModelGet)
    for (status, identifier) in responses:
        if status:
            print('C-GET query status: 0x{0:04x}'.format(status.Status))
        else:
            print('Connection timed out, was aborted or received invalid response')

    # Release the association
    assoc.release()
else:
    print('Association rejected, aborted or never connected')

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I've googled and googled until my googler was sore. Any help would be appreciated.

Posts by wdtj

dgate daemon will not shut down

dgate daemon will not shut down

pynetdicom C_GET failing with No presentation context for 'CT Image Storage' has been accepted by the peer for the SCP role

pynetdicom C_GET failing with No presentation context for 'CT Image Storage' has been accepted by the peer for the SCP role

pynetdicom C_GET failing with No presentation context for 'CT Image Storage' has been accepted by the peer for the SCP role