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DICOM PS3.3 2020a - Information Object Definitions |
Attribute Name |
Tag |
Type |
Attribute Description |
>>>Referenced ROI |
(3006,0084) |
1C |
The value of ROI Number (3006,0022) in the referenced SOP |
Number |
|
|
Instance that identifies the ROI that is the origin of the Spatial |
|
|
|
Fiducial information. |
Required if Referenced SOP Class UID (0008,1150) is RT
Structure Set Storage ("1.2.840.10008.5.1.4.1.1.481.3").
C.21.2.1 Spatial Fiducials Module Attribute Descriptions
C.21.2.1.1 Shape Type
For convenient registration, correlated Fiducials exist in each image set of the Registration Sequence. Correlated Fiducials are iden- tified with either Fiducial Identifier (0070,0310) or Fiducial Identifier Code Sequence (0070,0311).
Shape Type (0070,0306) defines the geometric interpretation of Contour Data (3006,0050) and Graphic Data (0070,0022). A point is defined as a triplet (x,y,z) in the case of spatial data or a pair (x,y) in the case of graphic data.
Defined Terms:
POINT a single point designating a single fiducial point.
Note
A point may be the epicenter of a more complex shape such as sphere.
LINE two points that specify a line or axis such as the inter-orbital line. The point locations have no significance other than identifying the line, i.e., they are not line segment end points.
PLANE three points that identify a plane such as the laterality plane
SURFACEthreeormorepoints(usuallymany)thatresideon,ornear,aregionofacurvedsurface.Thesurfacemaybeflatorcurved, closed or open. The point order has no significance.
RULER two or more evenly spaced collinear points ordered sequentially along the line, such as a physical ruler placed in the imaging field.
L_SHAPEthree points of two perpendicular line segments, AB and BC, having a common end point B. The order of the points is: ABC. May represent an L-shaped marker placed in the imaging field.
T_SHAPEthree points of two perpendicular line segments AB and CD, such that C bisects AB. The order is ABD.
SHAPE two or more points that specify the shape of a well-known fiducial type. The term in the Fiducial Identifier Code Sequence (0070,0311) defines the shape and the order of the points that represent it. A shape is closed if the first and last point are the same, but not otherwise. Two different points are a line segment.
C.21.2.1.2 Contour Data
ContourData(3006,0050)isanorderedsetoftripletsthatdefinesashape.Thetriplets(x,y,z)denotepointsintheReferenceCoordinate
System of the Registration Instance.
Note
Contours may associate observational data with a set of Image features or specify coordinates that are input data for a measurement.
C.21.2.1.3 Contour Uncertainty Radius
The uncertainty is an estimate of the standard deviation of the fiducial location process.
C.22 Media Creation Management Specific Modules
The following Sections specify Modules used for Media Creation Management.