This value set includes codes based on the following rules:

• Include these codes as defined in http://dicom.nema.org/resources/ontology/DCM

  Code	Display	Definition
  112084	Lucency	The shadow of an absorber that attenuates the primary X-Ray beam less effectively than do surrounding absorbers. In a radiograph, any circumscribed area that appears more nearly black (of greater photometric density) than its surround [Fraser and Pare].
  130751	Tissue not of interest	Tissue that is other than that which is of interest for the purpose of the task.
  125041	Registration Input	A segment for use as an input to an image registration process.
  125040	Background	That which is not part of an object.
  113132	Single subject extracted from group	A single subject that has been selected from amongst multiple subjects (e.g., a group of animals imaged simultaneously).
  112082	Interface	The common boundary between the shadows of two juxtaposed structures or tissues of different texture or opacity (edge, border) [Fraser and Pare].
  112083	Line	A longitudinal opacity no greater than 2 mm in width [Fraser and Pare].

• Include these codes as defined in http://ncit.nci.nih.gov

  Code	Display
  C94970	Reference Region

• Include these codes as defined in http://snomed.info/sct

  Code	Display
  17621005	Normal
  289925000	Waste Material
  85756007	Tissue