C.8.31.2 Breast X-Ray Positioner Macro
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#### C.8.31.2 Breast X-Ray Positioner Macro

Table C.8.31.2-1 specifies the Attributes of the Breast X-Ray Positioner Functional Group Macro.

Table C.8.31.2-1. Breast X-Ray Positioner Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Positioner Position Sequence | (0018,9405) | 1 | A sequence that describes the geometrical position of the positioner. Only a single Item shall be included in this Sequence.
>Positioner Primary Angle | (0018,1510) | 1C | Signed position in degrees of the X-Ray beam vector in the coronal anatomical plane as if the patient were standing facing the equipment where vertical is zero. Required if X-Ray source can be moved in the coronal anatomical plane. May be present otherwise.
>Positioner Primary Angle Direction | (0018,9559) | 1C | The interpretation of the sign of the Positioner Primary Angle (0018,1510). Enumerated Values: CW Clockwise. Positioner Primary Angle movement is positive when movement is from vertical to the patient's right (with patient standing, facing the equipment). CC Counter-clockwise. Positioner Primary Angle is positive when movement is from vertical to the patient's left (with patient standing, facing the equipment). See Figure C.8.31.2-1. Required if Positioner Primary Angle (0018,1510) is present.
>Positioner Secondary Angle | (0018,1511) | 1C | Position in degrees of the X-Ray beam vector in the sagittal anatomical plane as if the patient were standing where movement of the X-Ray source from anterior to posterior is positive, and vertical is zero. Required if the X-Ray source can be moved in the sagittal anatomical plane. May be present otherwise.

##### C.8.31.2.1 Breast X-Ray Positioner Attribute Descriptions

Figure C.8.31.2-1 illustrates the Defined Terms for Positioner Primary Angle Direction (0018,9559), indicating which C-arm movement direction defines a positive value for Positioner Primary Angle (0018,1510).

Figure C.8.31.2-1. Illustration of Positioner Primary Angle Direction

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