Geometric shapes, which are equivalent to markups, describe a user's region of interest on an image and are patterned after DICOM SR graphical types. Combinations of these shapes can be used to represent graphical drawings placed on images.
Select the Shape Type from the options of two-dimensional and three-dimensional shapes.
The geometric shapes available are as follows. ATB follows the DICOM standard.
Shape | Description |
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2D Point (Arrow) | A single pixel denoted by a single (column,row) pair |
2D Circle | 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. |
2D Polyline (Closed Polygon) | 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. |
2D Ellipse | An ellipse defined by four pixel (column,row) pairs. The first two points specify the endpoints of the major axis and the second two points specify the endpoints of the minor axis of an ellipse. |
2D Multipoint (Connected Points) | Multiple pixels each denoted by a (column,row) pair |
3D Polygon (Closed 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.
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3D Polyline (Connected Line Segments) | A series of connected line segments with ordered vertices denoted by (x,y,z) triplets. The points need not be coplanar.
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3D Multipoint (Series of Points) | Multiple locations each denoted by an (x,y,z) triplet. The points need not be coplanar.
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3D Point (Arrow) | A single location denoted by a single (x,y,z) triplet. |
3D Ellipse | An ellipse defined by four (x,y,z) triplets. The first two triplets specify the endpoints of the major axis and the second two triplets specify the endpoints of the minor axis.
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3D 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”.
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