Add seed point for purpose of region Status Letter Ballot Date of Last Update 2022/06/23 Person Assigned David Clunie Submitter Name IDC Submission Date 2021/11/27 Correction Number CP-2195 Log Summary: Add seed point for purpose of region Name of Standard PS3.16 Rationale for Correction: CID 219 Geometry Graphical Representation is the value set for (130400, DCM, "Geometric purpose of region") in the TID 1500 sub-templates. It contains the concept of a center point, but not that of seed points (e.g., for segmentation, such as via region growing), which may need to be recorded if a segmentation is to be repeated, and which provide a record of human observer input. Seed points are not necessarily in the center of whatever is being segmented. There is currently no standard code for "seed point" in SNOMED CT, NCIt, nor is there anything in UMLS or BioPortal. Also, CP 1852, which added CID 219, included (111010, DCM, "Center") but not some other existing center concepts in DICOM; add them. Correction Wording: Resources: HTML | FHIR JSON | FHIR XML | IHE SVS XML Type: Extensible Version: 20210121yyyymmdd UID: 1.2.840.10008.6.1.1304

Geometry Graphical Representation

Coding Scheme Designator	Code Value	Code Meaning	SNOMED-RT ID	UMLS Concept Unique ID
SCT	75958009	Bounded by	G-C020	C0332297
DCM	111010	Center
DCM	128137	Geometric Centerpoint
DCM	128138	Center of Mass
DCM	111041	Outline
DCM	130490	Centerline
DCM	ddd001	Seed point

The items in this context group identify a specific point associated with a reference basis (see CID 1000 "CT Transverse Plane Reference Basis"). Resources: HTML | FHIR JSON | FHIR XML | IHE SVS XML Type: Extensible Version: 20160905 UID: 1.2.840.10008.6.1.1129

Reference Geometry - Points

Coding Scheme Designator	Code Value	Code Meaning
DCM	128137	Geometric Centerpoint
DCM	128138	Center of Mass

DICOM Controlled Terminology Definitions (Coding Scheme Designator "DCM" Coding Scheme Version "01")

Code Value	Code Meaning	Definition	Notes
111010	Center	The central point of a finding or feature.	May be used as the Purpose of Reference for Content Item of value type COMPOSITE or SCOORD, or a qualitative observation on an ROI.
128137	Geometric Centerpoint	The geometric center point of a feature, such as an organ, implanted device or morphologic anomaly.
128138	Center of Mass	The center of mass of a feature, such as an organ, implanted device or morphologic anomaly
ddd001	Seed point	Point in an image or space from which segmentation is initiated, e.g., by region growing.	May be selected by a human or an algorithm. Not necessarily the center of the feature being segmented.