Table C.8.19.6-14 specifies the Attributes of the X-Ray Geometry Macro.
Table C.8.19.6-14. X-Ray Geometry Macro Attributes
Attribute Name
Tag
Type
Attribute Description
X-Ray Geometry Sequence
(0018,9476)
1
Sequence containing the geometric properties for this frame.
Only a single Item shall be included in this Sequence.
>Distance Source to Isocenter
(0018,9402)
Distance from source to isocenter in mm.
>Distance Source to Detector
(0018,1110)
Distance from source to receptor plane perpendicular to the receptor plane in mm.
This value is traditionally referred to as Source Image Receptor Distance (SID).