<status value="active"/><experimental value="false"/><date value="2021-01-05T10:01:24+11:00"/><publisher value="HL7 (FHIR Project)"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom><telecom><system value="email"/><value value="fhir@lists.hl7.org"/></telecom></contact><description value="The type of coordinates describing a 2D image region."/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/imagingselection-2dgraphictype"/><content value="complete"/><concept><code value="point"/><display value="POINT"/><definition value="A single location denoted by a single (x,y) pair."/></concept><concept><code value="polyline"/><display value="POLYLINE"/><definition value="A series of connected line segments with ordered vertices denoted by (x,y) triplets; the points need not be coplanar."/></concept><concept><code value="interpolated"/><display value="INTERPOLATED"/><definition value="An n-tuple list of (x,y) pair end points between which some form of implementation dependent curved lines are to be drawn. The rendered line shall pass through all the specified points."/></concept><concept><code value="circle"/><display value="CIRCLE"/><definition value="Two points shall be present; the first point is to be interpreted as the center and the second point as a point on the circumference of a circle, some form of implementation dependent representation of which is to be drawn."/></concept><concept><code value="ellipse"/><display value="ELLIPSE"/><definition value="An ellipse defined by four (x,y) pairs, the first two pairs specifying the endpoints of the major axis and the second two pairs specifying the endpoints of the minor axis."/></concept></CodeSystem>

This code system http://hl7.org/fhir/imagingselection-2dgraphictype defines the following codes:

Code	Display	Definition
point	POINT	A single location denoted by a single (x,y) pair.
polyline	POLYLINE	A series of connected line segments with ordered vertices denoted by (x,y) triplets; the points need not be coplanar.
interpolated	INTERPOLATED	An n-tuple list of (x,y) pair end points between which some form of implementation dependent curved lines are to be drawn. The rendered line shall pass through all the specified points.
circle	CIRCLE	Two points shall be present; the first point is to be interpreted as the center and the second point as a point on the circumference of a circle, some form of implementation dependent representation of which is to be drawn.
ellipse	ELLIPSE	An ellipse defined by four (x,y) pairs, the first two pairs specifying the endpoints of the major axis and the second two pairs specifying the endpoints of the minor axis.