K.6.2.2 General Purpose Worklist Information Model

K.6.2.2.1 E/R Model

In response to a given C-FIND request, the General Purpose Worklist SCP might have to send several C-FIND responses, (i.e. one C-FIND response per matching worklist item). Each worklist item focuses on a single General Purpose Scheduled Procedure Step and the related information. The E-R diagram presented in Figure K.6-2 depicts the content of one C-FIND request, that is:

- the matching General Purpose Scheduled Procedure Step, the list of Requested Procedures to which the General Purpose Scheduled Procedure Step contributes, the Imaging Service Request(s) in which the associated Requested Procedures are ordered, and the Patient of interest.

Therefore, for a given C-FIND request, a given General Purpose Scheduled Procedure Step will appear in only one of the resulting C-FIND responses. Obviously, information about the Requested Procedures, Imaging Service Requests, and Patients may be mentioned in several of these C-FIND responses.

In the Entity-Relationship Model, one Attribute shall be defined as the Unique Key for the General Purpose Scheduled Procedure Step. A single value in a Unique Key Attribute shall uniquely identify a single entity. That is, two entities may not have the same Unique Key value.

Note: The Unique Key in this case is the SOP Instance UID of the General Purpose Scheduled Procedure Step Instance. See Table K.6-2.

The worklist provider shall support existence and matching of the Unique Key defined by the General Purpose Worklist Information Model. All entities managed by the worklist provider shall have a specific non-zero length Unique Key value.

Unique Keys may be contained in the Identifier of a C-FIND request.

The General Purpose Worklist Information Model is represented by the Entity Relationship diagram shown in figure K.6-2.

The entry point of the General Purpose Worklist is the General Purpose Scheduled Procedure Step entity.

The attributes of a General Purpose Worklist can be found in

PS 3.3 "Patient Relationship Module"

PS 3.3 "Patient Identification Module"

PS 3.3 "Patient Demographic Module"

PS 3.3 "Patient Medical Module"

PS 3.3 "General Purpose Scheduled Procedure Step Relationship Module"

PS 3.3 "General Purpose Scheduled Procedure Step Information Module"

[pic]

Figure K.6-2.

General Purpose Worklist Information Model E-R Diagram

K.6.2.2.2 General Purpose Worklist Attributes

Table K.6-2 defines the Attributes of the General Purpose Worklist Information Model:

Table K.6-2 Attributes for the General Purpose Worklist Information Model

Description / Module Tag Match-ing Key Type Return Key Type Remark / Matching Type
SOP Common
SOP Class UID (0008,0016) O 1 Uniquely identifies the SOP Class of the General Purpose Scheduled Procedure Step. See Section K.6.2.2.3 for further explanation.
SOP Instance UID (0008,0018) U 1 Uniquely identifies the SOP Instance of the General Purpose Scheduled Procedure Step. See Section K.6.2.2.3 for further explanation. SOP Instance UID shall be retrieved with Single Value Matching.
General Purpose Scheduled Procedure Step Information
General Purpose Scheduled Procedure Step Status (0040,4001) R 1 General Purpose Scheduled Procedure Step Status shall be retrieved with Single Value Matching.
Input Availability Flag (0040,4020) R 1 Input Availability Flag shall be retrieved with Single Value Matching.
General Purpose Scheduled Procedure Step Priority (0040,4003) R 1 General Purpose Scheduled Procedure Step Priority shall be retrieved with Single Value Matching.
Scheduled Procedure Step ID (0040,0009) O 1
Scheduled Procedure Step Modification Date Time (0040,4010) O 3 Scheduled Procedure Step Modification DateTime shall be retrieved with Single Value Matching or Range Matching.
Scheduled Workitem Code Sequence (0040,4018) R 1 The Attributes of the Scheduled Workitem Code Sequence shall only be retrieved with Sequence Matching. The Scheduled Workitem Code Sequence shall contain only a single Item.
>Code Value (0008,0100) R 1 Code Value shall be retrieved with Single Value Matching.
>Coding Scheme Designator (0008,0102) R 1 Coding Scheme Designator shall be retrieved with Single Value Matching.
>Code Meaning (0008,0104) - 1 Code Meaning shall not be used as Matching Key.
Scheduled Processing Applications Code Sequence (0040,4004) O 2
>Code Value (0008,0100) O 1
>Coding Scheme Designator (0008,0102) O 1
>Code Meaning (0008,0104) - 1 Code Meaning shall not be used as Matching Key.
Scheduled Station Name Code Sequence (0040,4025) R 2 The Attributes of the Scheduled Station Name Code Sequence shall only be retrieved with Sequence Matching.
>Code Value (0008,0100) R 1 Code Value shall be retrieved with Single Value Matching.
>Coding Scheme Designator (0008,0102) R 1 Coding Scheme Designator shall be retrieved with Single Value Matching.
>Code Meaning (0008,0104) - 1 Code Meaning shall not be used as Matching Key.
Scheduled Station Class Code Sequence (0040,4026) R 2 The Attributes of the Scheduled Station Class Code Sequence shall only be retrieved with Sequence Matching.
>Code Value (0008,0100) R 1 Code Value shall be retrieved with Single Value Matching.
>Coding Scheme Designator (0008,0102) R 1 Coding Scheme Designator shall be retrieved with Single Value Matching.
>Code Meaning (0008,0104) - 1 Code Meaning shall not be used as Matching Key.
Scheduled Station Geographic Location Code Sequence (0040,4027) R 2 The Attributes of the Scheduled Station Geographic Location Code Sequence shall only be retrieved with Sequence Matching.
>Code Value (0008,0100) R 1 Code Value shall be retrieved with Single Value Matching.
>Coding Scheme Designator (0008,0102) R 1 Coding Scheme Designator shall be retrieved with Single Value Matching.
>Code Meaning (0008,0104) - 1 Code Meaning shall not be used as Matching Key.
Scheduled Procedure Step Start Date Time (0040,4005) R 1 Scheduled Procedure Step Start Date Time shall be retrieved with Single Value Matching or Range Matching.
Expected Completion Date Time (0040,4011) R 2 Expected Completion Date Time shall be retrieved with Single Value Matching or Range Matching.
Scheduled Human Performers Sequence (0040,4034) R 2 The Attributes of the Scheduled Human Performers Sequence shall only be retrieved with Sequence Matching.
>Human Performer Code Sequence (0040,4009) R 1 The Attributes of the Scheduled Human Performers Code Sequence shall only be retrieved with Sequence Matching.
>>Code Value (0008,0100) R 1 Code Value shall be retrieved with Single Value Matching.
>>Coding Scheme Designator (0008,0102) R 1 Coding Scheme Designator shall be retrieved with Single Value Matching.
>>Code Meaning (0008,0104) - 1 Code Meaning shall not be used as Matching Key.
>Human Performer's Name (0040,4037) O 3
>Human Performer's Organization (0040,4036) O 3
Referenced Performed Procedure Step Sequence (0008,1111) O 2
>Referenced SOP Class UID (0008,1150) O 1
>Referenced SOP Instance UID (0008,1155) O 1
Input Information Sequence (0040,4021) O 2
>Study Instance UID (0020,000D) O 1
>Referenced Series Sequence (0008,1115) O 1
>>Series Instance UID (0020,000E) O 1
>>Retrieve AE Title (0008,0054) O 2C Shall not be present if Storage Media File-Set ID (0088,0130) or Storage Media File-Set UID (0088,0140) is present.
>>Storage Media File-Set ID (0088,0130) O 2C Shall not be present if Retrieve AE Title (0008,0054) is present.
>>Storage Media File-Set UID (0088,0140) O 2C Shall not be present if Retrieve AE Title (0008,0054) is present.
>>Referenced SOP Sequence (0008,1199) O 1
>>>Referenced SOP Class UID (0008,1150) O 1
>>>Referenced SOP Instance UID (0008,1155) O 1
>>>Purpose of Reference Code Sequence (0040,A170) O 3
>>>>Code Value (0008,0100) - 1
>>>>Coding Scheme Designator (0008,0102) - 1
>>>>Code Meaning (0008,0104) - 1
Relevant Information Sequence (0040,4022) O 2
>Study Instance UID (0020,000D) O 1
>Referenced Series Sequence (0008,1115) O 3
>>Series Instance UID (0020,000E) O 1
>>Retrieve AE Title (0008,0054) O 2C Shall not be present if Storage Media File-Set ID (0088,0130) or Storage Media File-Set UID (0088,0140) is present.
>>Storage Media File-Set ID (0088,0130) O 2C Shall not be present if Retrieve AE Title (0008,0054) is present.
>>Storage Media File-Set UID (0088,0140) O 2C Shall not be present if Retrieve AE Title (0008,0054) is present.
>>Referenced SOP Sequence (0008,1199) O 1
>>>Referenced SOP Class UID (0008,1150) O 1
>>>Referenced SOP Instance UID (0008,1155) O 1
>>>Purpose of Reference Code Sequence (0040,A170) O 3
>>>>Code Value (0008,0100) - 1
>>>>Coding Scheme Designator (0008,0102) - 1
>>>>Code Meaning (0008,0104) - 1
Resulting General Purpose Performed Procedure Step Sequence (0040,4015) O 2 This sequence shall be updated when related General Purpose Performed Procedure Step SOP Instances are created.
>Referenced SOP Class UID (0008,1150) O 1
>Referenced SOP Instance UID (0008,1155) O 1
Actual Human Performers Sequence (0040,4035) O 2 This sequence shall be updated when this information is included in the Modify General Purpose Scheduled Procedure Step Information N-ACTION Request.
>Human Performer Code Sequence (0040,4009) O 1
>>Code Value (0008,0100) O 1
>>Coding Scheme Designator (0008,0102) O 1
>>Code Meaning (0008,0104) - 1 Code Meaning shall not be used as Matching Key.
>Human Performer's Name (0040,4037) O 3
>Human Performer's Organization (0040,4036) O 3
Study Instance UID (0020,000D) O 1 This is the Study Instance UID that shall be used to identify the Composite SOP Instances resulting from this worklist item.
Study Date (0008,0020) O 3 See note 3.
Study Time (0008,0030) O 3 See note 3.
Multiple Copies Flag (0040,4006) O 1 This Attribute shall be used to determine if multiple copies of Composite SOP Instances have to be created.
All other Attributes from the General Purpose Scheduled Procedure Step Information Module O 3
General Purpose Scheduled Procedure Step Relationship
Referenced Request Sequence (0040,A370) O 1
>Study Instance UID (0020,000D) O 1 This is the Study Instance UID that shall be used to identify an identical copy of an SR Object, in case multiple copies are created.
>Referenced Study Sequence (0008,1110) O 2
>>Referenced SOP Class UID (0008,1150) O 1
>>Referenced SOP Instance UID (0008,1155) O 1
>Requested Procedure ID (0040,1001) O 1
>Requested Procedure Description (0032,1060) O 1C The Requested Procedure Description (0032,1060) or the Requested Procedure Code Sequence (0032,1064) or both shall be supported by the SCP.
>Requested Procedure Code Sequence (0032,1064) O 1C The Requested Procedure Description (0032,1060) or the Requested Procedure Code Sequence (0032,1064) or both shall be supported by the SCP. The Requested Procedure Code Sequence shall contain only a single Item.
>>Code Value (0008,0100) O 1
>>Coding Scheme Designator (0008,0102) O 1
>>Code Meaning (0008,0104) - 1 Code Meaning shall not be used as Matching Key.
>Accession Number (0008,0050) R 2 Accession Number shall be retrieved with Single Value Matching.
>Requesting Physician (0032,1032) O 2
>All other Attributes relating to the Requested Procedure and the Imaging Service Request in the General Purpose Scheduled Procedure Step Relationship Module O 3
Patient Relationship
All Attributes from the Patient Relationship Module except those explicitly included in this Table (see Note) O 3
Patient Identification
Patient's Name (0010,0010) R 1 Patient's Name shall be retrieved with Single Value Matching or Wild Card Matching.
Patient ID (0010,0020) R 1 Patient ID shall be retrieved with Single Value Matching.
All other Attributes from the Patient Identification Module O 3
Patient Demographic
Patient's Birth Date (0010,0030) O 2
Patient's Sex (0010,0040) O 2
All other Attributes from the Patient Demographic Module O 3
Patient Medical
Pertinent Documents Sequence (0038,0100) O 3 Pertinent Documents Sequence shall be retrieved with Universal Matching only
>Referenced SOP Class UID (0008,1150) - 1
>Referenced SOP Instance UID (0008,1155) - 1
>Purpose of Reference Code Sequence (0040,A170) - 2
>>Code Value (0008,0100) - 1
>>Coding Scheme Designator (0008,0102) - 1
>>Code Meaning (0008,0104) - 1
>Document Title (0042,0010) - 2
All other Attributes from the Patient Medical Module O 3

Notes: 1. The reason for this exclusion is to assure that the attributes that may be present in multiple modules are included only once with the meaning pertaining to only one module (for example, Referenced Study Sequence (0008,1110) shall be included once with the meaning as defined in the Requested Procedure Module).

2. The use of Specific Character Set is discussed in section K.4.1.1.3.1 and K.4.1.1.3.2.

3. The values of Study Date (0008,0020) and Study Time (0008,0030) may be provided in order to achieve consistency of Study level attributes in composite instances generated in multiple performed procedure steps on different devices, and the worklist values may be updated by the SCP based on information received from General Purpose Performed Procedure Steps or by examining the composite instances generated. In the absence of these attributes, the values in the composite instances in the Input Information Sequence (0040,4021) may be used.

The attributes in Table K.6-2a are not part of the Worklist Information Model; their inclusion in the C-FIND request and response identifier are governed by rules in sections K.4.1.1.3.1 and K.4.1.1.3.2, respectively.

Table K.6-2aATTRIBUTES FOR THE GENERAL PURPOSE WORKLIST C-FIND IDENTIFIER

Description Tag Request Identifier Response Identifier Remark Type
Specific Character Set (0008,0005) 1C 1C This attribute is required if expanded or replacement character sets are used. See C.2.2.2 and K.4.1.1.3
Timezone Offset From UTC (0008,0201) 1C 1C This attribute is required if times are to be interpreted explicitly in the designated local timezone. See C.2.2.2 and K.4.1.1.3.
HL7 Structured Document Reference Sequence (0040,A390) - 1C One or more Items may be included in this sequence. Required if HL7 Structured Documents are referenced within the Identifier. See K.4.1.1.3
>Referenced SOP Class UID (0008,1150) - 1
>Referenced SOP Instance UID (0008,1155) - 1
>HL7 Instance Identifier (0040,E001) - 1
>Retrieve URI (0040,E010) - 3

K.6.2.2.3 Unique Identification of the General Purpose Worklist Item

The SOP Class UID and SOP Instance UID Attributes are defined for all DICOM IODs. For Normalized IODs they are not encoded in the IOD, but contained in the respective Attributes in the DIMSE Services. The General Purpose Scheduled Procedure Step SOP Instance is a persistent object, and the SOP Class UID and SOP Instance UID are included in the General Purpose Worklist. The value for this attribute originates from the SOP Instance UID assigned to the corresponding object at the time of creation by the SCP.