C. 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.


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.
>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.