worklist "no items found" question - DICOM

This is a discussion on worklist "no items found" question - DICOM ; I have installed a medison accuvix on a network and worklist server connects, then performs a query and then comes up with a "no items found" response with a "cancel" option. any ideas on the possible connectivity/configuration problem? thanks, dk...

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  1. worklist "no items found" question


    I have installed a medison accuvix on a network and worklist server
    connects, then performs a query and then comes up with a "no items
    found" response with a "cancel" option.

    any ideas on the possible connectivity/configuration problem?

    thanks,

    dk

  2. Re: worklist "no items found" question


    There are several different patterns or archeotype behaviors that
    modalities vendors tend to use in their queries to modality worklists.
    One model is for the modality to query for a single specific
    procedure, often based on a technician entry or barcode scanning of a
    procedure identifier. Another pattern is to query for and return
    multiple entries for a specific patient, again performed based on
    technician input, but resulting in a pick list that the technician
    selects from. Still another approach is one where the modality issues
    a "broad query" trying to find multiple entries that are likely to be
    performed on the modality during some near term, but not neccessarily
    immediate timeframe. The results of this query are cached on the
    modality and maintained in a pick list that the technician can choose
    from when initiating a new exam. It has been my experience that
    ultrasound vendors tend to use this latter pattern for their worklist
    scu implementation.

    When querying a general worklist provider which serves a worklist for
    all procedures performed in a department or even a whole facility, the
    trick is providing a suffcient query keys such that the modality does
    not receive an excessive list of procedures unlikely or impossible to
    be performed on the querying device. A typical way this can be
    accomplished is for the device to filter entries by the modality code
    -- i.e specifying a value of "US" for (0008,0060) Modality on the
    worklist to limit the entries to only those procedures identified as
    ultrasound. Additional constraints may also be used such as limiting
    the returned entries to only those procedures scheduled to be
    performed within say 1 before the current time and 2 hours after the
    current time. A tight filter might limit the returned entries to only
    those procedures explicitly scheduled for the querying device's AE
    Title (Scheduled State AE Title).


    The accuvix dicom conformance statement found at
    http://www.sonoace.de/pdf/accuvix%20xq_dcs_rev1-sdg.pdf
    identifies a number attributes queried for/retrieved from a worklist
    server

    From the conformance statement, the device is apparently configured to
    only search for entries with "US" as the modality type. It is unclear
    whether they are configurable to query/filter by specific values, but
    the conformance statement also shows the device can query for
    scheduled ae title (0040,001), Scheduled Start Date (0040,0002) and
    Scheduled Start Time (0004,0003) start time.

    It can be useful to query for these attributes to prevent too many or
    inappropriate exam entries from being downloaded and presented on the
    ultrasound device pick list, but they can also overly constrain a
    query so no results are returned. For example, if the modality is
    configured to only query the worklist for it's own AE Title in
    (0040,0001) - Scheduled Station AE Title, AND the worklist provider
    doesn't schedule procedures to a specific device, then the modality
    will not receive any results. Again, in my experience, ultrasound
    departments often have multiple devices with different AE Titles, all
    of which can perform any of the ultrasound procedures performed in the
    department. In these cases, patients are typically queue and assigned
    a device/station on a first available basis. Thus, it would be
    counterproductive for worklist provider to assign a specific Scheduled
    AE Title to entries on the worklist.

    In diagnosing the problem of why you're not getting anything returned
    to the modality, there are two things you need to know: First,. what
    query or filter tags is the modality using? Second what values is the
    worklist provider populating the entries on the worklist with -- are
    they being populated with appropriate values? For example, I've seen
    cases where worklist SCPs were setup to populate all entries with
    modality code "CR" unless explicitly overridden. You know already that
    the accuvix is only looking for entries with modality code "US". So
    first check is to query the worklist with a query client and determine
    whether there are any entries on the worklist with modality code US.
    Basically - you have to work it from both directions - what is
    modality filtering on? Is it excluding procedures it should be seeing
    due to overly constrained query parameters. What is the worklist
    provider populating entries with? Are the values appropriate so the
    accuvix should be able to distinguish the appropriate procedures and
    filter the inappropriate ones.



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