Working with Context Groups

The use of Coded Concepts in DICOM facilitates unambiguous communication of concepts or terms. Coded Concepts are incorporated in IODs using Code Sequence Attributes as described in PS 3.3 of the DICOM Standard.

A set of related Coded Concepts forms a Context Group. The Context Groups defined by the DICOM Content Mapping Resource (DCMR) (which is specified by PS 3.16 of the DICOM Standard) are maintained by LEADTOOLS in an internal table. We will refer to this table as the Context Group Table. For a list of the Context Identifiers (CIDs) of these Context Groups, along with their names, refer to Context Identifier Values.

LEADTOOLS provides a number of functions for working with a table of Context Groups. Most of these functions are named like L_DicomxxxContextGroup or like L_DicomxxxCodedConcept.

Initially, the Context Group Table is empty. LEADTOOLS provides two ways to add Context Groups to the table:

LEADTOOLS provides the following functions for maneuvering through the Context Groups in the Context Group Table:





You can also use the L_DicomGetCountContextGroup and L_DicomFindIndexContextGroup functions to enumerate the Context Groups in the Context Group Table.

Use the L_DicomFindContextGroup function to search the Context Group Table for the Context Group with a particular Context ID.

Use the L_DicomDeleteContextGroup function to remove individual Context Groups from the Context Group Table. You can also use the L_DicomResetContextGroup function to remove all the Context Groups at once.

LEADTOOLS provides the following functions for investigating the Coded Concepts of a Context Group:








Use the L_DicomFindCodedConcept function to search the Context Groups in the Context Group Table for a specific Coding Scheme Designator and Code Value.

Use the following functions to modify, add, or delete Coded Concepts from an existing Context Group:




If a Context Group in the Context Group Table has a corresponding Context Group in the internal table maintained by LEADTOOLS, then you can use the L_DicomDefaultContextGroup function to discard any changes made to the Context Group in the Context Group Table.

Use the L_DicomExistsContextGroup or L_DicomExistsCodedConcept functions to determine whether a pointer to a Context Group structure or to a Coded Concept structure is valid, respectively.

Help Version 19.0.2017.10.27
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