| DICOM PS3.3 2024c - Information Object Definitions |
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Table C.18.6-1 specifies the Attributes of the Spatial Coordinates Macro, which convey Spatial Coordinates in an SCOORD Content Item. An SCOORD Content Item shall always be the Source Content Item of one or more SELECTED FROM Relationships with IMAGE Target Content Items. Each IMAGE Target Content Item shall contain a reference to one single-frame or multi-frame Image.
The same set of spatial coordinates may be selected from more than one single-frame image, or more than one frame of a multi-frame image when the purpose of reference is applicable to multiple images. For example, the spatial coordinates may specify the outline of a sampling region at the same spatial location on multiple images acquired over time.
Table C.18.6-1. Spatial Coordinates Macro Attributes
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An ordered set of (column,row) pairs that denote positions in an image specified with sub-pixel resolution such that the origin at the TLHC of the TLHC pixel is 0.0\0.0, the BRHC of the TLHC pixel is 1.0\1.0, and the BRHC of the BRHC pixel is Columns\Rows. The values must be within the range 0\0 to Columns\Rows. The maximum values are those contained in the referenced image in Attributes Columns (0028,0011) and Rows (0028,0010), or in the case of spatial coordinates with Pixel Origin Interpretation (0048,0301) value VOLUME, in Attributes Total Pixel Matrix Columns (0048,0006) and Total Pixel Matrix Rows (0048,0007). See Section C.18.6.1.1 for further explanation. |
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See Section C.18.6.1.2 for Enumerated Values. |
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For a referenced multi-frame image, specifies whether the Graphic Data (0070,0022) values are to be interpreted relative to the individual frame pixel origins, or relative to the Total Pixel Matrix origin (see Section C.8.12.4.1.4). Required if the instance referenced by Referenced Image Sequence (0008,1140) is tiled (i.e., contains Total Pixel Matrix Columns (0048,0006) and Total Pixel Matrix Rows (0048,0007)). May be present otherwise. If not present, Graphic Data values are defined relative to the frame pixel origin. |
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Graphic Data may be used to associate an anatomic or spatial Concept with a defined subset of one or more images. Graphic Data may be explicitly defined 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).
When annotation applies to an image, this Attribute defines the type of geometry of the annotated region of interest.
Enumerated Values:
a series of connected line segments with ordered vertices denoted by (column,row) pairs; if the first and last vertices are the same it is a closed polygon
a circle defined by two (column,row) pairs. The first point is the central pixel. The second point is a pixel on the perimeter of the circle.
an ellipse defined by four pixel (column,row) pairs, the first two points specifying the endpoints of the major axis and the second two points specifying the endpoints of the minor axis of an ellipse
The order of encoding of successive points for any particular Graphic Type is significant, but its meaning is not specified. The meaning of the order may be defined by a particular Template that uses them. For example, a closed POLYLINE may be encoded with a clockwise (right) or counter-clockwise (left) winding order (when viewed from a specified direction). A two-point POLYLINE used to encode a vector with a direction might be expected to originate at the first encoded point and be directed towards the second encoded point, but that is not specified.
A Polygon encoded as a POLYLINE is not restricted to being a simple polygon, unless so specified by the Template that uses it.
| DICOM PS3.3 2024c - Information Object Definitions |
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