| DICOM PS3.3 2024d - Information Object Definitions |
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Table C.21.2-1 specifies the Attributes of the Registration.
Table C.21.2-1. Spatial Fiducials Module Attributes
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Include Table 10-12 “Content Identification Macro Attributes” |
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Identifies a Frame of Reference that may or may not be an image set (e.g., an atlas or physical space). See Section C.7.4.1.1.1 for further explanation. Required if Referenced Image Sequence (0008,1140) is absent. May be present otherwise. |
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Identifies the set of images in which the fiducials are located. One or more Items shall be included in this Sequence. Required if Frame of Reference UID (0020,0052) is absent. May be present otherwise. All referenced images shall have the same Frame of Reference UID if present in the images. |
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>>Include Table 10-3 “Image SOP Instance Reference Macro Attributes” |
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A fiducial assignment identifier that is unique within this Fiducial Sequence (0070,031E) Item but may match the fiducial identifier of an equivalent feature in another Item. |
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Sequence defining the general category of the property the fiducial represents. |
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>>>Include Table 8.8-1 “Code Sequence Macro Attributes” |
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A Code Sequence for a term that identifies a well-known fiducial type (potentially including methodology, anatomy, tools, etc.). Only a single Item shall be included in this Sequence. Required if Identifier (0070,0310) is absent. May be present otherwise. |
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>>>Include Table 8.8-1 “Code Sequence Macro Attributes” |
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Globally unique identifier for the fiducial instance of this fiducial assignment. |
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See Section C.21.2.1.1 for Defined Terms. |
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Specifies the coordinates of this Item's fiducial. One triplet (x,y,z) shall be present for each point in the fiducial. See Section C.21.2.1.2 for further explanation. Required if Frame of Reference UID (0020,0052) is present in this Item of the Fiducial Set Sequence (0070,031C). Shall not be present otherwise. |
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The estimated uncertainty radius for the Contour Data in mm. See Section C.21.2.1.3 |
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The image pixel locations of the fiducial's points. One or more Items shall be included in this Sequence. More than one Item shall be present only if a fiducial spans more than one image. Required if Contour Data is not present. May be present otherwise. |
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Graphic point coordinates of the fiducial points in the image of the Referenced Image Sequence. If Fiducial's Contour Data (3006,0050) is present, these points correlate to the points in the Contour Data, one row-column pair for each point and in the same order. See Section C.10.5.1.2 for further explanation. |
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A Sequence that specifies the image containing the fiducial's graphic coordinates. Only a single Item shall be included in this Sequence. Shall be an image within the set of the images in the Referenced Image Sequence (0008,1140) of the encapsulating Fiducial Set Sequence (0070,031C) Item. |
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>>>>Include Table 10-3 “Image SOP Instance Reference Macro Attributes” |
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Instances containing the source of the ROI Contour information. |
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>>>Include Table 10-11 “SOP Instance Reference Macro Attributes”. |
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The value of ROI Number (3006,0022) in the referenced SOP 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"). |
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For convenient registration, correlated Fiducials exist in each image set of the Registration Sequence. Correlated Fiducials are identified 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:
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.
three points that identify a plane such as the laterality plane
three or more points (usually many) that reside on, or near, a region of a curved surface. The surface may be flat or curved, closed or open. The point order has no significance.
two or more evenly spaced collinear points ordered sequentially along the line, such as a physical ruler placed in the imaging field.
three 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.
three points of two perpendicular line segments AB and CD, such that C bisects AB. The order is ABD.
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.
| DICOM PS3.3 2024d - Information Object Definitions |
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