Материал: part03

Attribute Description​

Parameter values for each Protocol Element in the acquisition protocol.​

EachItemintheSequencedescribesoneElement.Elementsareperformed​

in the order of their Protocol Element Number (0018,9921).​

See Section C.34.9.1.​

Zero or more Items shall be included in this Sequence.​

Description of the method used during acquisition.​

See Section C.8.15.3.2.1 for Defined Terms.​

TheconstantangleatwhichtheX-Raysourceislocatedduringacquisition.​

0degreesmeansthatthesourceislocatedatthehighestpointofthegantry​

orbit. Degrees increase from 0 to positive 360 in a clockwise direction as​

viewed when facing the gantry where the table enters the gantry.​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Description​

Identifies that the acquisition was performed by repetitively acquiring the​

same volume set over a period of time.​

Note​

The Acquisition Type (0018,9302) value may be SEQUENCED,​

SPIRALorSTATIONARYdependingonwhethertablemovement​

is necessary to cover the volume.​

Enumerated Values:​

YES​

NO​

Identifies that near real-time display of a block of continuously acquired​

data was performed.​

Enumerated Values:​

YES​

NO​

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.​

RequiredifAcquisitionType(0018,9302)isotherthanCONSTANT_ANGLE.​

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

Note​

Adjacentphysicaldetectorrowsmayhavebeencombinedtoform​

a single effective acquisition row.​

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.​

Thedistanceinmmfromthetopofthepatienttabletothecenterofrotation​

of the source (i.e., the data collection center or isocenter). The distance is​

positive when the table is below the data collection center.​

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.​

Thedistanceinmmthatthetablemovesinonesecondduringthegathering​

of data.​

Motion of the table (in mm) during a complete revolution of the source​

around the gantry orbit.​

Ratio of the Table Feed per Rotation (0018,9310) to the Total Collimation​

Width (0018,9307).​

DICOM PS3.3 2020a - Information Object Definitions​

Computed Tomography Dose Index (CTDI vol), in mGy according to [IEC​

It describes the average CTDIvol for this AcquisitionProtocol Element for​

Required if Acquisition Type (0018,9302) is not CONSTANT_ANGLE. May​

The type of phantom used for CTDI measurement according to [IEC​

The threshold for the CTDIvol value, in mGy, at which a dose notification​

The threshold for the DLP value, in mGy.cm, at which a dose notification​

ThevalueofNOT_IMPORTANTisnotpermittedinthePerformedProcedure​

Anatomically oriented transverse location where this acquisition starts.​

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DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

>>Include Table 10.27-1 “Reference Location Macro​

BCID 1000 “CT Transverse Plane Reference Basis” for Reference Basis​

Attributes”​

Code Sequence (0018,9902)​

BCID 1010 “Reference Geometry - Planes” for Reference Geometry Code​

Sequence (0018,9903)​

>AcquisitionEndLocation​

Anatomically oriented transverse location where this acquisition ends.​

Sequence​

1.​This represents the nominal end location. Due to overscan,​

tissue may be irradiated beyond this location.​

2.​InaDefinedProcedureProtocol,thisrepresentstheintended​

end location. The operator may or may not select a location​

that exactly matches this anatomical location.​

3.​InaPerformedProcedureProtocol,thisvaluemayhavebeen​

copied from the Defined Procedure Protocol and may not​

represent the exact anatomical location selected by the​

Only a single Item is permitted in the Sequence.​

>>Include Table 10.27-1 “Reference Location Macro​

BCID 1000 “CT Transverse Plane Reference Basis” for Reference Basis​

Attributes”​

Code Sequence (0018,9902)​

BCID 1010 “Reference Geometry - Planes” for Reference Geometry Code​

Sequence (0018,9903)​

>CT X-Ray Details​

Parameter values for each of the X-Ray beams in the Acquisition Protocol​

Sequence​

Element. Each Item in the Sequence describes one X-Ray beam.​

See Section C.34.10.3.​

One or more Items shall be included in this Sequence.​

>>Beam Number​

Identification number of the beam.​

>>KVP​

Peak kilo voltage output of the X-Ray generator.​

>>Exposure Time in ms​

Duration of exposure for this Acquisition Protocol Element in milliseconds.​

If Acquisition Type (0018,9302) equals SPIRAL the duration of exposure​

shall be weighted by the Spiral Pitch Factor (0018,9311).​

>>X-Ray Tube Current in​

Nominal X-Ray tube current in milliamperes.​

mA​

>>Exposure in mAs​

The exposure expressed in milliampere seconds, for example calculated​

from exposure time and X-Ray tube current.​

>>Auto KVP Selection​

The type of automated selection of the kVp value.​

Type​

DIAMETER_BASED​Value is selected based on patient diameter.​

DICOM PS3.3 2020a - Information Object Definitions​

Current is modulated over different tube angles.​

view.​