C.8.19.6.12 X-Ray Collimator Macro
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##### C.8.19.6.12 X-Ray Collimator Macro

Table C.8.19.6-12 specifies the attributes of the X-Ray Collimator Functional Group Macro.

Table C.8.19.6-12. X-Ray Collimator Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Collimator Shape Sequence | (0018,9407) | 1 | A sequence that describes the collimator shape. Only a single Item shall be included in this Sequence.
>Collimator Shape | (0018,1700) | 1 | Shape(s) of the collimator. Enumerated Values: RECTANGULAR CIRCULAR POLYGONAL This multi-valued Attribute shall contain at most one of each Enumerated Value.
>Collimator Left Vertical Edge | (0018,1702) | 1C | Required if Collimator Shape (0018,1700) is RECTANGULAR. Location of the left edge of the rectangular collimator expressed as effective pixel column. See Section C.8.7.3.1.1 and Section C.8.19.6.12.1.
>Collimator Right Vertical Edge | (0018,1704) | 1C | Required if Collimator Shape (0018,1700) is RECTANGULAR. Location of the right edge of the rectangular collimator expressed as effective pixel column. See Section C.8.7.3.1.1 and Section C.8.19.6.12.1.
>Collimator Upper Horizontal Edge | (0018,1706) | 1C | Required if Collimator Shape (0018,1700) is RECTANGULAR. Location of the upper edge of the rectangular collimator expressed as effective pixel row. See Section C.8.7.3.1.1 and Section C.8.19.6.12.1.
>Collimator Lower Horizontal Edge | (0018,1708) | 1C | Required if Collimator Shape (0018,1700) is RECTANGULAR. Location of the lower edge of the rectangular collimator expressed as effective pixel row. See Section C.8.7.3.1.1 and Section C.8.19.6.12.1.
>Center of Circular Collimator | (0018,1710) | 1C | Required if Collimator Shape (0018,1700) is CIRCULAR. Location of the center of the circular collimator expressed as effective pixel row and column. See Section C.8.7.3.1.1 and Section C.8.19.6.12.1.
>Radius of Circular Collimator | (0018,1712) | 1C | Required if Collimator Shape (0018,1700) is CIRCULAR. Radius of the circular collimator expressed as effective number of pixels along the row direction. See Section C.8.7.3.1.1 and Section C.8.19.6.12.1.
>Vertices of the Polygonal Collimator | (0018,1720) | 1C | Required if Collimator Shape (0018,1700) is POLYGONAL. Multiple Values where the first set of two values are: row of the origin vertex; column of the origin vertex. Two or more pairs of values follow and are the effective pixel row and column coordinates of the other vertices of the polygon collimator. Polygon collimators are implicitly closed from the last vertex to the origin vertex and all edges shall be non-intersecting except at the vertices. See Section C.8.19.6.12.1.

###### C.8.19.6.12.1 X-Ray Collimator Attributes

The top left pixel of the image has a pixel row and column value of 1.

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