C.8.15.3.11 CT Additional X-Ray Source Macro
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##### C.8.15.3.11 CT Additional X-Ray Source Macro

Table C.8-126b specifies the attributes of the CT Additional X-Ray Source Macro. This sequence may be multi-valued, depending on the number of additional active X-Ray sources. It defines the X-Ray source parameters beyond the basic system.

Table C.8-126b. CT Additional X-Ray Source Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
CT Additional X-Ray Source Sequence | (0018,9360) | 1 | Contains the attributes defining the data acquisition in a multiple X-Ray source system beyond the primary source. The primary X-Ray source is specified in the CT X-Ray Details Sequence. One or more Items shall be included in this sequence.
>KVP | (0018,0060) | 1 | Peak kilo voltage output of the X-Ray generator used.
>X-Ray Tube Current in mA | (0018,9330) | 1 | Nominal X-Ray tube current in milliamperes.
>Data Collection Diameter | (0018,0090) | 1 | The diameter in mm of the region over which data were collected.
>Focal Spot(s) | (0018,1190) | 1 | Used nominal size of the focal spot in mm.
>Filter Type | (0018,1160) | 1 | Type of filter(s) inserted into the X-Ray beam. See Section C.8.15.3.9.
>Filter Material | (0018,7050) | 1 | The X-Ray absorbing material used in the filter.
>Exposure in mAs | (0018,9332) | 1 | The exposure expressed in milliampere seconds, for example calculated from exposure time and X-Ray tube current.
>Energy Weighting Factor | (0018,9353) | 1C | The weighting factor of the data from this additional source in a multiple energy composition image. This factor incorporates the effects of the specific X-Ray source and kV value examination specific characteristics. Required if Required if Frame Type (0008,9007) Value 4 of this frame is ENERGY_PROP_WT. May be present otherwise.

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