DICOM PS3.3 2019e - Information Object Definitions
C.8.15.3.9 CT X-Ray Details Macro

Table C.8-125 specifies the Attributes of the CT X-Ray Details Functional Group Macro.

Table C.8-125. CT X-Ray Details Sequence Macro Attributes

Attribute Name

Tag

Type

Attribute Description

CT X-Ray Details Sequence

(0018,9325)

1

Contains the Attributes defining the X-Ray information.

If Multi-energy CT Acquisition (0018,9361) is NO or is absent, only a single Item shall be included in this Sequence.

If Multi-energy CT Acquisition (0018,9361) is YES, one or more Items shall be included in this Sequence.

>Referenced Path Index

(0018,9378)

1C

References the X-Ray Path Index (0018,937A) in the Multi-energy CT Path Sequence (0018,9379) for this exposure.

Note

This attribute may contain multiple values if this item describes multiple paths.

Required if Multi-energy CT Acquisition (0018,9361) is YES.

>KVP

(0018,0060)

1C

Nominal peak kilo voltage output of the X-Ray generator used.

If Multi-energy Source Technique (0018,9368) in Multi-energy CT X-Ray Source Sequence (0018,9365) (of the referenced Multi-energy CT Path Index (0018,937A)) is “SWITCHING_SOURCE”, this value is the nominal peak value for a switching phase. The switching phase is identified by the value of X-Ray Source Index (0018,9366) in the Multi-energy CT Path Sequence (0018,9379) corresponding to the value of Referenced Path Index (0018,9378) in this Sequence.

Due to limitations of the generating hardware the actual voltage may not reach the nominal peak value.

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.

>Focal Spot(s)

(0018,1190)

1C

Used nominal size of the focal spot in mm. The Attribute may only have one or two values, for devices with variable focal spot, small dimension followed by large dimension

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.

>Filter Type

(0018,1160)

1C

Type of filter(s) inserted into the X-Ray beam.

Defined Terms:

WEDGE

BUTTERFLY

MULTIPLE

FLAT

SHAPED

NONE

Note

Multiple type of filters can be expressed by a combination, e.g., BUTTERFLY+WEDGE.

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.

>Filter Material

(0018,7050)

1C

The X-Ray absorbing material used in the filter. May be multi-valued.

Defined Terms:

MOLYBDENUM

ALUMINUM

COPPER

RHODIUM

NIOBIUM

EUROPIUM

LEAD

MIXED

Note

MIXED may be used to indicate a filter type of complex composition for which listing the individual materials would be excessive or undesirable; it is not intended to mean "unknown".

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL and the value of Filter Type (0018,1160) is other than NONE. May be present otherwise.

>Calcium Scoring Mass Factor Patient

(0018,9351)

3

The calibration factor for the calcium mass score. These factors incorporate the effects of

  • KV value of the CT image

  • the patient size.

  • machine specific corrections

See Section C.8.2.1.1.7.

>Calcium Scoring Mass Factor Device

(0018,9352)

3

The calibration factors for the calcium mass score of the device. These factors incorporate the effects of

  • KV value of the CT image

  • machine specific corrections

This a multi-value Attribute, the first value specifies the mass factor for a small patient size, the second value for a medium patient size and the third value for a large patient size.

See Section C.8.2.1.1.7.

>Energy Weighting Factor

(0018,9353)

1C

The weighting factor of the data from this Sequence Item.

Required if Required if Frame Type (0008,9007) Value 4 of this frame is ENERGY_PROP_WT. May be present otherwise.


DICOM PS3.3 2019e - Information Object Definitions