CCOW DICOM Study Identity Subjects

DICOM Study Identity Subjects

The DICOM standard's information model uses the hierarchy of studies, study components, series and instances to identify objects such as images, reports, waveforms etc. A single instance of the DICOM object is uniquely identifiable but sharing the context at the level above the object instance level is useful in real world practice. To facilitate such context sharing the CCOW standard defines separate context subjects to represent each of these levels.

DICOM Study Identity subjects have the following attributes:

DICOM uses globally unique ISO UIDs to identify an instance of a DICOM object. There is no need to use context suffix to differentiate DICOM subjects.

DICOM Study Identity Subject

The DICOM study identity subject represents a DICOM study object for a specific patient. DICOM Study Identity subjects have the following standard context data item. An application should set the value for the item listed in the following table:

An application can optionally set values for the corroborating items listed in the following table:

Examples of DICOM Study subject items are listed in the following table:

DICOM Study Component Identity Subject

The DICOM Study Component Identity subject represents a specific DICOM study component object for a patient. DICOM Study Component Identity subjects have the following standard context data items. An application should set values for all of the items listed in the following table:

The DICOMStudyComponent.Id.InstanceUID item can have one of the following values:

• The DICOM SOP Instance UID (0008,0018) attribute of a normalized DICOM object of the Detached Study Component Management SOP Class.
• The DICOM SOP Instance UID (0008,0018) attribute of a normalized DICOM object of the Modality or General Purpose Performed Procedure Step SOP Classes.

The DICOMStudyComponent.Id.ClassUID item can have one of the following values:

• The DICOM SOP Class UID (0008, 0016) attribute of a normalized DICOM object of the Detached Study Component Management SOP Class (i.e. “1.2.840.10008.3.1.2.3.2”).
• The DICOM SOP Class UID (0008, 0016) attribute of a normalized DICOM object of the Modality Performed Procedure Step SOP Class (i.e. “1.2.840.10008.3.1.2.3.3”) or General Purpose performed Procedure Step SOP Class (i.e. “1.2.840.10008.5.1.4.32.3”).

Examples of DICOM Study Subject Items are listed in the following table:

DICOM Series Identity Subject

The DICOM Series Identity subject represents a DICOM series object for a specific patient. DICOM Series subjects have the following standard context data items:

Example of DICOM Series subject items are listed in the following table:

DICOM Instance Identity Subject

The DICOM Instance Identity subject represents a DICOM object instance such as image, waveform or structured report for a specific patient. DICOM Instance subjects have the following standard context data items:

An application should set the DICOMInstance.Id.InstanceUID and DICOMInstance.Id.ClassUID when setting DICOM instance context.

The DICOM SOP Instance UID (0008, 0018) attribute value of a composite DICOM storage SOP class object should be used as DICOMInstance.Id.InstanceUID item value. The DICOM SOP Class UID (0008, 0016) attribute value of a composite DICOM storage SOP class object should be used as DICOMInstance.Id.ClassUID item value.

Examples of DICOM Instance subject items are listed in the following table. This case corresponds to selected frames of an X-Ray Angiographic Image Storage object instance: