C.8.21.2.3 Breast Tomosynthesis Contributing Sources Module
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##### C.8.21.2.3 Breast Tomosynthesis Contributing Sources Module

This section describes the Breast Tomosynthesis Contributing Sources Module. The attributes in this Module specify the overall characteristics of one or more source images that were used to create a Breast Tomosynthesis Image SOP Class instance. Table C.8.21.2.3-1 contains the IOD Attributes that describe Breast Tomosynthesis Contributing Sources.

### Note

The intention of this module is to supply acquisition information without the need to have access to all the source projection images.

Table C.8.21.2.3-1. Breast Tomosynthesis Contributing Sources Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Contributing Sources Sequence | (0018,9506) | 1 | A sequence that describes characteristics of the sources that are used to create a derived SOP Instance. One or more Items shall be included in this Sequence.
>Include Table 10-13 “General Contributing Sources Macro Attributes” |
>Include Table 10-14 “Contributing Image Sources Macro Attributes” |
>Detector Type | (0018,7004) | 1 | The type of detector used to acquire this image. Defined Terms: DIRECT X-Ray photoconductor SCINTILLATOR Phosphor used STORAGE Storage phosphor
>Detector ID | (0018,700A) | 1 | The ID or serial number of the detector used to acquire this image.
>Date of Last Detector Calibration | (0018,700C) | 1 | The date on which the detector used to acquire this image as identified in Detector ID (0018,700A) was last calibrated.
>Time of Last Detector Calibration | (0018,700E) | 1 | The time at which the detector used to acquire this image as identified in Detector ID (0018,700A) was last calibrated.
>Detector Element Spacing | (0018,7022) | 1 | Physical distance between the center of each detector element, specified by a numeric pair: row spacing value (delimiter) column spacing value in mm. See Section 10.7.1.3 for further explanation of the value order. ### Note This may not be the same as the Imager Pixel Spacing (0018,1164), and should not be assumed to describe the stored image.

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