Table C.18.9-1 specifies the Attributes that convey 3D Spatial Coordinates in an SCOORD3D Content Item.

Table C.18.9-1

3D SPATIAL COORDINATES MACRO ATTRIBUTES

Attribute Name | Tag | Type | Attribute Description |

Referenced Frame of Reference UID | (3006,0024) | 1 | Uniquely identifies the Frame of Reference within which the coordinates are defined. |

Graphic Data | (0070,0022) | 1 | An ordered set of (x,y,z) triplets (in mm and may be negative) that define a region of interest in the patient-relative Reference Coordinate System defined by Referenced Frame of Reference UID (3006,0024). See Section 3.17.1. See C.18.9.1.1 for further explanation. |

Graphic Type | (0070,0023) | 1 | See C.18.9.1.2 for Enumerated Values. |

Fiducial UID | (0070,031A) | 3 | The globally unique identifier for this fiducial item. Note: The fiducial UID can be used to associate this set of graphics with other Content Items. |

Graphic Data may be used to associate an anatomic or spatial Concept with a defined set of patient relative 3D locations in a defined frame of reference, independent of any image. Graphic Data may be defined explicitly as a single point (i.e. to denote the epicenter of an anatomic site or lesion) or more than one point (i.e. representing a set of points or an open or closed polygon).

This attribute defines the type of geometry of the region of interest. The following Enumerated Values are specified for 3D spatial coordinate geometries:

POINT = a single location denoted by a single (x,y,z) triplet.

MULTIPOINT = multiple locations each denoted by an (x,y,z) triplet; the points need not be coplanar.

POLYLINE = a series of connected line segments with ordered vertices denoted by (x,y,z) triplets; the points need not be coplanar.

POLYGON = a series of connected line segments with ordered vertices denoted by (x,y,z) triplets, where the first and last vertices shall be the same forming a polygon; the points shall be coplanar.

ELLIPSE = an ellipse defined by four (x,y,z) triplets, the first two triplets specifying the endpoints of the major axis and the second two triplets specifying the endpoints of the minor axis.

ELLIPSOID = A three-dimensional geometric surface whose plane sections are either ellipses or circles and contains three intersecting orthogonal axes, “a”, “b”, and “c”. The ellipsoid is defined by six (x,y,z) triplets, the first and second triplets specifying the endpoints of axis “a”, the third and fourth triplets specifying the endpoints of axis “b”, and the fifth and sixth triplets specifying the endpoints of axis “c”.

Notes: 1. A circle is a special case of ELLIPSE where the major and minor axis points are equidistant from the center.

2. Coplanar is in the mathematical sense and is not necessarily related to a specific image instance.