C.8.31.4 Breast X-Ray Geometry Macro
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#### C.8.31.4 Breast X-Ray Geometry Macro

Table C.8.31.4-1 specifies the Attributes of the Breast X-Ray Geometry Functional Group Macro.

Table C.8.31.4-1. Breast 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 or set of frames. Only a single Item shall be included in this sequence.
>Distance Source to Detector | (0018,1110) | 1C | Distance in mm from source to detector center on the chest wall line. Required if Presentation Intent Type (0008,0068) = FOR PROCESSING. May be present otherwise. ### Note This value is traditionally referred to as Source Image Distance (SID). See C.8.11.7.1.1.
>Distance Source to Patient | (0018,1111) | 1C | Distance in mm from source to the Breast Support side that is closest to the Imaging Subject, as measured along the X-Ray beam vector. Required if Presentation Intent Type (0008,0068) = FOR PROCESSING. May be present otherwise. ### Note This value is traditionally referred to as Source Object Distance (SOD). See notes for this attribute in C.8.11.5. See C.8.11.7.1.1 for description of X-Ray beam vector.
>Distance Source to Isocenter | (0018,9402) | 1C | Distance from source to isocenter in mm. Required if Presentation Intent Type (0008,0068) = FOR PROCESSING. May be present otherwise.
>Distance Source to Entrance | (0040,0306) | 3 | Distance in mm from the source to the surface of the patient closest to the source during the acquisition of this image. ### Note This may be an estimated value based on assumptions about the patient's body size and habitus.
>Estimated Radiographic Magnification Factor | (0018,1114) | 1 | Ratio of Source Image Distance (SID) over Source Object Distance (SOD).

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C.8.31.3 Breast X-Ray Detector Macro | Home | C.8.31.5 Breast X-Ray Acquisition Dose Macro