3.9 DICOM Service Class Definitions

The following definitions are commonly used in this Part of the DICOM Standard:

Combined Print Image: a pixel matrix created by superimposing an image and an overlay, the size of which is defined by the smallest rectangle enclosing the superimposed image and overlay.

DICOM Information Model: an Entity-Relationship diagram which is used to model the relationships between the Information Object Definitions representing classes of Real-World Objects defined by the DICOM Application Model.

DICOM Application Model : an Entity-Relationship diagram used to model the relationships between Real-World Objects which are within the area of interest of the DICOM Standard.

Meta Service-Object Pair (SOP) Class: a pre-defined set of SOP Classes that may be associated under a single SOP for the purpose of negotiating the use of the set with a single item.

Preformatted Grayscale Image: an image where all annotation, graphics, and grayscale transformations (up to and including the VOI LUT) expected in the printed image have been burnt in or applied before being sent to the SCP. It is a displayable image where the polarity of the intended display is specified by Photometric Interpretation (0028,0004).

Preformatted Color Image: an image where all annotation, graphics, and color transformations expected in the printed image have been burnt in or applied before being sent to the SCP.

Real-World Activity: that which exists in the real world which pertains to specific area of information processing within the area of interest of the DICOM Standard. Such a Real-World Activity may be represented by one or more computer information metaphors called SOP Classes.

Real-World Object: that which exists in the real world upon which operations may be performed which are within the area of interest of the DICOM Standard. Such a Real-World Object may be represented through a computer information metaphor called a SOP Instance.

Service Class User: the role played by a DICOM Application Entity (DIMSE-Service-User) which invokes operations and performs notifications on a specific Association.

Service Class Provider: the role played by a DICOM Application Entity (DIMSE-Service-User) which performs operations and invokes notifications on a specific Association.

Service Class: a collection of SOP Classes and/or Meta SOP Classes which are related in that they are described together to accomplish a single application.

Service-Object Pair (SOP) Class: the union of a specific set of DIMSE Services and one related Information Object Definition (as specified by a Service Class Definition) which completely defines a precise context for communication of operations on such an object or notifications about its state.

Service-Object Pair (SOP) Instance: a concrete occurrence of an Information Object that is managed by a DICOM Application Entity and may be operated upon in a communication context defined by a specific set of DIMSE Services (on a network or interchange media). A SOP Instance is persistent beyond the context of its communication.

Related General SOP Class: a SOP Class that is related to another SOP Class as being more generalized in terms of behavior defined in the standard, and which may be used to identically encode an instance with the same attributes and values, other than the SOP Class UID. In particular, this may be the SOP Class from which a Specialized SOP Class (see PS3.2) is derived .