C.8.31.2 Breast X-Ray Positioner Macro

C.8.31.2 Breast X-Ray Positioner Macro
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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