C.8.21.3.4 Breast Tomosynthesis Acquisition Module
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##### C.8.21.3.4 Breast Tomosynthesis Acquisition Module

This section describes the Breast Tomosynthesis Acquisition Module.

Table C.8.21.3.4-1. Breast Tomosynthesis Acquisition Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
X-Ray 3D Acquisition Sequence | (0018,9507) | 1 | Each Item represents an acquisition context related to one or more reconstructions. The values of Acquisition Index (0020,9518) may be used as index in this sequence. One or more Items shall be included in this sequence.
>Field of View Shape | (0018,1147) | 1 | Shape of the Field of View in the source projection images. Enumerated Values: RECTANGLE
>X-Ray Receptor Type | (0018,9420) | 1 | Identifies the type of X-Ray receptor used. Enumerated Values: DIGITAL_DETECTOR
>Include Table C.8.21.3.1.1-1 “X-Ray 3D General Shared Acquisition Macro Attributes” |
>Include Table C.8.21.3.1.3-1 “X-Ray 3D General Positioner Movement Macro Attributes” |
>Distance Source to Detector | (0018,1110) | 1 | Distance in mm from source to detector center on the chest wall line. ### Note This value is traditionally referred to as Source Image Distance (SID). See Section C.8.11.7.1.1.
>Distance Source to Patient | (0018,1111) | 1 | 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. ### Note This value is traditionally referred to as Source Object Distance (SOD). See notes for this attribute in Section C.8.11.5 DX Positioning Module. See Section C.8.11.7.1.1 for description of X-Ray beam vector.
>Estimated Radiographic Magnification Factor | (0018,1114) | 1 | Ratio of Source Image Receptor Distance (SID) over Source Object Distance (SOD).
>Anode Target Material | (0018,1191) | 1 | The primary material in the anode of the X-Ray source. Defined Terms: TUNGSTEN MOLYBDENUM RHODIUM
>Body Part Thickness | (0018,11A0) | 1 | The average thickness in mm of the body part examined when compressed, if compression has been applied during exposure.
>Exposure Control Mode | (0018,7060) | 1 | Type of exposure control. Defined Terms: MANUAL AUTOMATIC
>Exposure Control Mode Description | (0018,7062) | 1 | Text description of the mechanism of exposure control. May describe the number and type of exposure sensors or position of the sensitive area of the imaging detector.
>Half Value Layer | (0040,0314) | 1 | The thickness of Aluminum in mm required to reduce the X-Ray Output (0040,0312) by a factor of two. ### Note This value may be a calibrated value rather than measured during the exposure.
>Organ Dose | (0040,0316) | 3 | Organ dose value measured in dGy representing the collective total for all acquired frames described in this sequence item. ### Note This may be an estimated value.
>Entrance Dose in mGy | (0040,8302) | 3 | Entrance dose value measured in mGy at the surface of the patient representing the collective total for all acquired frames described in this sequence item. ### Note This may be an estimated value based on assumptions about the patient's body size and habitus.
>Focal Spot(s) | (0018,1190) | 1 | Nominal focal spot size in mm used to acquire the projection images.
>Detector Binning | (0018,701A) | 1C | Number of active detectors used to generate a single pixel. Specified as number of row detectors per pixel then column. Required if detector binning was applied to the projection images.
>Detector Temperature | (0018,7001) | 1 | Detector temperature during exposure in degrees Celsius.
>Filter Type | (0018,1160) | 1 | Type of filter(s) inserted into the X-Ray beam (e.g., wedges). See Attribute Description in Section C.8.7.10 for Defined Terms.
>Filter Material | (0018,7050) | 1 | The X-Ray absorbing material used in the filter. May be multi-valued. See Attribute Description in Section C.8.7.10 for Defined Terms.
>Filter Thickness Minimum | (0018,7052) | 3 | See Attribute Description in Section C.8.7.10.
>Filter Thickness Maximum | (0018,7054) | 3 | See Attribute Description in Section C.8.7.10.
>Filter Beam Path Length Minimum | (0018,7056) | 3 | See Attribute Description in Section C.8.7.10.
>Filter Beam Path Length Maximum | (0018,7058) | 3 | See Attribute Description in Section C.8.7.10.
>Compression Force | (0018,11A2) | 1 | The compression force applied to the body part during exposure, measured in Newtons.
>Paddle Description | (0018,11A4) | 1 | Description of the compression paddle, if compression was applied to the body part during exposure.
>Per Projection Acquisition Sequence | (0018,9538) | 1 | Sequence containing detailed acquisition context of each individual projection used in this acquisition context. One or more Items shall be included in this sequence.
>>Include Table C.8.21.3.1.2-1 “X-Ray 3D General Per Projection Acquisition Macro Attributes” |
>>Positioner Primary Angle | (0018,1510) | 1 | 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.
>>Positioner Primary Angle Direction | (0018,9559) | 3 | 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 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 Section C.8.31.2.1.
>>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 secondary positioner was used during acquisition.
>>Exposure Time in ms | (0018,9328) | 1 | Duration of X-Ray exposure in milliseconds. See Section C.8.7.2.1.1.
>>Exposure in mAs | (0018,9332) | 1 | The exposure expressed in milliampereseconds, for example calculated from Exposure Time and X-Ray Tube Current.
>>Relative X-Ray Exposure | (0018,1405) | 1 | Indication of the applied dose, in manufacturer specific units. ### Note This value is intended to provide a single location where manufacturer specific information can be found for annotation on a display or film, that has meaning to a knowledgeable observer. This may be a calculated or measured value. Examples are the detector entrance dose (KB), the CR sensitivity value (S), or the logarithmic median (lgM). This value is manufacturer-specific. DICOM specifies standard Attributes in Table 10-23 'Exposure Index Macro', which are recommended.
>>Organ Dose | (0040,0316) | 3 | Average organ dose value measured in dGy. ### Note This may be an estimated value.
>>Entrance Dose in mGy | (0040,8302) | 3 | Average entrance dose value measured in mGy at the surface of the patient during the acquisition of this projection image. ### Note This may be an estimated value based on assumptions about the patient's body size and habitus.
>>Include Table 10-23 “Exposure Index Macro Attributes” |
>>Irradiation Event UID | (0008,3010) | 3 | Unique identification of the irradiation event(s) associated with the acquisition of this image.

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