DICOM PS3.5 2019b - Data Structures and Encoding

7.4.2 Type 1C Conditional Data Elements

IODs and SOP Classes define Data Elements that shall be included under certain specified conditions. Type 1C elements have the same requirements as Type 1 elements under these conditions. It is a protocol violation if the specified conditions are met and the Data Element is not included.

When the specified conditions are not met, Type 1C elements shall not be included in the Data Set.

DICOM PS3.5 2019b - Data Structures and Encoding