C.8.15.3.2 CT Acquisition Type Macro

C.8.15.3.2 CT Acquisition Type Macro (Current)
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Table C.8-118 specifies the Attributes of the CT Acquisition Type Macro.

Table C.8-118. CT Acquisition Type Macro Attributes

Attribute Name	Tag	Type	Attribute Description
CT Acquisition Type Sequence	(0018,9301)	1	Contains the Attributes defining the CT acquisition mode. Only a single Item shall be included in this Sequence.
>Acquisition Type	(0018,9302)	1C	Description of the method used during acquisition of this frame. See Section C.8.15.3.2.1 for Defined Terms. Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.
>Tube Angle	(0018,9303)	1C	The constant angle at which the X-Ray source is located during acquisition. 0 degrees means that the source is located at the highest point of the gantry orbit. Degrees increase from 0 to positive 360 in a clockwise direction as viewed when facing the gantry where the table enters the gantry. Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL and Acquisition Type (0018,9302) is CONSTANT_ANGLE. May be present otherwise if Frame Type (0008,9007) Value 1 of this frame is DERIVED and Acquisition Type (0018,9302) is CONSTANT_ANGLE.
>Constant Volume Flag	(0018,9333)	1C	Identifies that the acquisition was performed by repetitively acquiring the same volume set over a period of time. Note Acquisition Type (0018,9302) may be SEQUENCED, SPIRAL or STATIONARY depending on whether table movement is necessary to cover the volume. Enumerated Values: YES NO Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.
>Fluoroscopy Flag	(0018,9334)	1C	Identifies that near real-time display of a block of continuously acquired data was performed, which may result in a lower than usual image quality. Enumerated Values: YES NO Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.

C.8.15.3.2.1 Acquisition Type

Defined Terms:

SEQUENCED: identifies that the acquisition was performed by acquiring single or multi detector data while rotating the source about the gantry while the table is not moving; additional slices may be acquired by incrementing the table position and again rotating the source about the gantry while the table is not moving
SPIRAL: identifies that the acquisition was performed by acquiring data while rotating the source about the gantry while continuously moving the table
CONSTANT_ANGLE: identifies that the acquisition was performed by holding the source at a constant angle and moving the table to obtain a projection image (e.g., a localizer image)
STATIONARY: identifies that the acquisition was performed by holding the table at a constant position and performing one or more acquisitions over time at the same location
FREE: identifies that the acquisition was performed while rotating the source about the gantry while the table movement is under direct control of a human operator or under the control of an analysis application (e.g., fluoroscopic image)

C.8.15.3.2 CT Acquisition Type Macro

Note

C.8.15.3.2.1 Acquisition Type