DICOM PS3.3 2025a - Information Object Definitions
C.8.15.3.3 CT Acquisition Details Macro (Current)
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PS3.3 > Information Module Definitions (Normative) > Modality Specific Modules > Enhanced CT Image > Enhanced CT Image Functional Group Macros > CT Acquisition Details Macro
C.8.15.3.3 CT Acquisition Details Macro

Table C.8-119 specifies the Attributes of the CT Acquisition Details Macro.

Table C.8-119. CT Acquisition Details Macro Attributes

Attribute Name

Tag

Type

Attribute Description

CT Acquisition Details Sequence

(0018,9304)

1

Contains the Attributes defining the details of the acquisition.

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.

>Rotation Direction

(0018,1140)

1C

Direction of rotation of the source about the gantry, as viewed while facing the gantry where the table enters the gantry.

Enumerated Values:

CW

clockwise

CC

counter clockwise

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL or Image Type (0008,0008) Value 1 is ORIGINAL, and Acquisition Type (0018,9302) is other than CONSTANT_ANGLE.

Otherwise may be present if Frame Type (0008,9007) Value 1 of this frame is DERIVED or Image Type (0008,0008) Value 1 is DERIVED, and Acquisition Type (0018,9302) is other than CONSTANT_ANGLE.

>Revolution Time

(0018,9305)

1C

The time in seconds of a complete revolution of the source around the gantry orbit. This value is independent of the Reconstruction Angle (0018,9319) of the frame.

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL or Image Type (0008,0008) Value 1 is ORIGINAL, and Acquisition Type (0018,9302) is other than CONSTANT_ANGLE.

Otherwise may be present if Frame Type (0008,9007) Value 1 of this frame is DERIVED or Image Type (0008,0008) Value 1 is DERIVED, and Acquisition Type (0018,9302) is other than CONSTANT_ANGLE.

>Single Collimation Width

(0018,9306)

1C

The width of a single row of acquired data (in mm).

Note

Adjacent physical detector rows may have been combined to form a single effective acquisition row.

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

>Total Collimation Width

(0018,9307)

1C

The width of the total collimation (in mm) over the area of active X-Ray detection.

Note

This will be equal to the number of effective detector rows multiplied by single collimation width.

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

>Table Height

(0018,1130)

1C

The distance in mm from the top of the patient table to the center of rotation of the source (i.e., the data collection center or isocenter). The distance is positive when the table is below the data collection center.

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

>Gantry/Detector Tilt

(0018,1120)

1C

Nominal angle of tilt in degrees of the scanning gantry. Not intended for mathematical computations. Zero degrees means the gantry is not tilted, negative degrees are when the top of the gantry is tilted away from where the table enters the gantry.

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

>Data Collection Diameter

(0018,0090)

1C

The diameter in mm of the region over which data were collected. See Section C.8.15.3.6.1.

Note

In the case of an Acquisition Type (0018,9302) of CONSTANT_ANGLE, the diameter is that in a plane normal to the central ray of the diverging X-Ray beam as it passes through the data collection center.

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

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DICOM PS3.3 2025a - Information Object Definitions