DICOM PS3.3 2020c - Information Object Definitions

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

  1. This value is traditionally referred to as Source Image Distance (SID).

  2. 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

  1. This value is traditionally referred to as Source Object Distance (SOD).

  2. See notes for this Attribute in C.8.11.5.

  3. 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).


DICOM PS3.3 2020c - Information Object Definitions