| DICOM PS3.3 2018e - Information Object Definitions |
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In general, a ROI can be defined by either a sequence of overlays or a sequence of contours. This Module, if present, is used to define the ROI as a set of contours. Each ROI contains a sequence of one or more contours, where a contour is either a single point (for a point ROI) or more than one point (representing an open or closed polygon).
Table C.8-42. ROI Contour Module Attributes
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Uniquely identifies the referenced ROI described in the Structure Set ROI Sequence (3006,0020). |
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RGB triplet color representation for ROI, specified using the range 0-255. |
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A default single gray unsigned value in which it is recommended that the contour be rendered on a monochrome display. The units are specified in P-Values from a minimum of 0000H (black) up to a maximum of FFFFH (white). |
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A default triplet value in which it is recommended that the contour be rendered on a color display. The units are specified in PCS-Values, and the value is encoded as CIELab. See Section C.10.7.1.1. |
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Sequence of Contours defining ROI. One or more Items are permitted in this Sequence. |
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Identification number of the contour. The value of Contour Number (3006,0048) shall be unique within the Contour Sequence (3006,0040) in which it is defined. No semantics or ordering shall be inferred from this Attribute. |
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List of Contour Number (3006,0048) defining lower-numbered contour(s) to which the current contour is connected. |
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>>>Include Table 10-3 “Image SOP Instance Reference Macro Attributes” |
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Geometric type of contour. See Section C.8.8.6.1. |
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Thickness of slab (in mm) represented by contour, where Contour Data (3006,0050) defines a plane in the center of the slab, offset by the Contour Offset Vector (3006,0045) if it is present. See Section C.8.8.6.2. |
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Vector (x,y,z) in the Patient-Based Coordinate System described in Section C.7.6.2.1.1 that is normal to plane of Contour Data (3006,0050), describing direction and magnitude of the offset (in mm) of each point of the central plane of a contour slab from the corresponding original point of Contour Data (3006,0050). See Section C.8.8.6.2. |
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Sequence of (x,y,z) triplets defining a contour in the Patient-Based Coordinate System described in Section C.7.6.2.1.1 (mm). See Section C.8.8.6.1 and Section C.8.8.6.3. |
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A contour can be one of the following geometric types:
A Contour Geometric Type (3006,0042) of POINT indicates that the contour is a single point, defining a specific location of significance.
A Contour Geometric Type (3006,0042) of OPEN_PLANAR indicates that the last vertex shall not be connected to the first point, and that all points in Contour Data (3006,0050) shall be coplanar.
A Contour Geometric Type (3006,0042) of OPEN_NONPLANAR indicates that the last vertex shall not be connected to the first point, and that the points in Contour Data (3006,0050) may be non-coplanar. Contours having a Geometric Type (3006,0042) of OPEN_NONPLANAR can be used to represent objects best described by a single, possibly non-coplanar curve, such as a brachytherapy applicator.
A Contour Geometric Type (3006,0042) of CLOSED_PLANAR indicates that the last point shall be connected to the first point, where the first point is not repeated in Contour Data (3006,0050). All points in Contour Data (3006,0050) shall be coplanar.
| DICOM PS3.3 2018e - Information Object Definitions |
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