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Page 1576​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

 

Attribute Description​

>>Cardiac​

(0018,9037)​

1​

Cardiacsynchronizationtechniqueappliedduringacquisitionorprocessing.​

Synchronization​

 

 

Enumerated Values:​

Technique​

 

 

 

 

 

NONE​

 

 

 

 

REALTIME​

 

 

 

 

PROSPECTIVE​

 

 

 

RETROSPECTIVE​

 

 

 

PACED​

 

 

 

 

See Section C.7.6.18.1.​

>>Cardiac Signal Source​

(0018,9085)​

1C​

Source of cardiac synchronization signal.​

 

 

 

Defined Terms:​

 

 

 

ECG​Electrocardiogram.​

 

 

 

VCG​Vector cardiogram.​

 

 

 

PP​ Peripheral pulse.​

 

 

 

Required if Cardiac Synchronization Technique (0018,9037) equals other​

 

 

 

than NONE.​

 

>>Cardiac RR Interval​

(0018,9070)​

1C​

R-R interval in ms measured prior to or during the scan.​

Specified​

 

 

Required if Cardiac Synchronization Technique (0018,9037) equals other​

 

 

 

 

 

 

than NONE.​

 

>>CardiacBeatRejection​

(0018,9169)​

1C​

Cardiac arrhythmia rejection technique.​

Technique​

 

 

Defined Terms:​

 

 

 

 

 

 

NONE​

 

 

 

 

RR_INTERVAL​Rejection based on deviation from average RR interval.​

 

 

 

QRS_LOOP​

Rejection based on deviation from regular QRS loop.​

 

 

 

PVC​

Rejection based on PVC criteria.​

 

 

 

Required if Cardiac Synchronization Technique (0018,9037) equals​

 

 

 

PROSPECTIVE or RETROSPECTIVE.​

>>Low R-R Value​

(0018,1081)​

2C​

R-R interval low limit for beat rejection, in ms.​

 

 

 

Required if Cardiac Synchronization Technique (0018,9037) equals​

 

 

 

PROSPECTIVE or RETROSPECTIVE.​

>>High R-R Value​

(0018,1082)​

2C​

R-R interval high limit for beat rejection, in ms.​

 

 

 

Required if Cardiac Synchronization Technique (0018,9037) equals​

 

 

 

PROSPECTIVE or RETROSPECTIVE.​

>>Skip Beats​

(0018,1086)​

3​

Number of beats prescribed to be skipped after each detected arrhythmia.​

>>Cardiac Framing Type​

(0018,1064)​

1C​

Type of framing performed.​

 

 

 

See Section C.7.6.18.1.1.1 for description and Defined Terms.​

Required if type of framing is not time forward from trigger, may be present​ otherwise.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1577​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>>Respiratory Motion​

(0018,9170)​

1​

Technique to reduce respiratory motion artifacts.​

 

CompensationTechnique​

 

 

Defined Terms:​

 

 

 

 

 

NONE​

BREATH_HOLD​

REALTIME​

GATING​

TRACKING​

RETROSPECTIVE​

CORRECTION​

 

 

See Section C.7.6.18.2.​

>>Respiratory Signal​

(0018,9171)​

1C​ Signal source from which respiratory motion is derived.​

Source​

 

Defined Terms:​

 

 

NONE​

BELT​

NASAL_PROBE​

CO2_SENSOR​

ECG​

 

 

 

Required if Respiratory Motion Compensation Technique (0018,9170)​

 

 

 

equals other than NONE or BREATH_HOLD. May be present otherwise.​

>>Respiratory Trigger​

(0020,9256)​

1C​

Respiratorytriggerthresholdinpercentofthechestexpansionfortheframe​

Delay Threshold​

 

 

relative to the last Respiratory-Peak.​

 

 

 

See Section C.7.6.16.2.17.1 for further explanation.​

 

 

 

Required if Respiratory Motion Compensation Technique (0018,9170)​

 

 

 

equals other than NONE, REALTIME or BREATH_HOLD. May be present​

 

 

 

otherwise.​

>>Respiratory Trigger​

(0020,9250)​

1C​

Characteristic of the respiratory signal used to the define the respiratory​

Type​

 

 

triggering.​

 

 

 

Defined Terms:​

 

 

 

TIME​

 

 

 

AMPLITUDE​

 

 

 

BOTH​

 

 

 

Required if the value is not TIME. May be present otherwise.​

>Requested Series​

(0018,9937)​

3​

Requested text to copy into the Series Description(0008,103E) of raw​

Description​

 

 

instances resulting from this Acquisition Protocol Element.​

>Content Qualification​

(0018,9004)​

3​

Content Qualification Indicator of instances resulting from this Acquisition​

 

 

 

Protocol Element.​

Enumerated Values:​

PRODUCT​

RESEARCH​

SERVICE​

See Section C.34.12.1.​

- Standard -​

Page 1578​

DICOM PS3.3 2020a - Information Object Definitions​

C.34.10.1 Acquisition Motion​

The motion, in patient terms, during acquisition progression. For example, due to the direction of contrast propogation or the need to​ manage equipment connected to the patient, it may be helpful to specify the acquisition progress in the expected direction of contrast​ propogation.​

A scan that shuttles back and forth can be encoded as multiple elements and each specifies the Start Location and the End Location.​ Alternatively,ascannermayprovidetheabilitytoshuttleinasinglescanelement,inwhichcasethisvalueindicatestheinitialdirection​ of motion and further details about the shuttling are likely contained in Private Attributes.​

C.34.10.2 Dose Notification Triggers​

The Computed Tomography Dose Check Standard (NEMA XR-25 athttp://www.nema.org/stds/xr25.cfm) specifies that a Notification​ Value may be set for the Computed Tomography Dose Index (CTDIvol) and/or the Dose Length Product (DLP) of each Protocol​ Element. A Dose Check Protocol Element corresponds to an Acquisition Protocol Element in this IOD.​

C.34.10.3 CT X-Ray Details Sequence​

Some systems perform Acquisition Protocol Elements with multiple tubes operating simultaneously, or with a tube switching back​ and forth between two energy settings. Such acquisitions are encoded with multiple Items in this Sequence.​

C.34.11 Defined CT Reconstruction Module​

Table C.34.11-1 contains specification of acceptable values and ranges of reconstruction parameters for an imaging procedure.​

Table C.34.11-1. Defined CT Reconstruction Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Reconstruction Protocol​

(0018,9933)​

1​

Specification of the parameters for reconstruction of the acquired data of​

Element Specification​

 

 

an imaging procedure.​

Sequence​

 

 

ThereshallbeoneIteminthisSequenceforeachreconstructionprotocol​

 

 

 

 

 

 

element in the Protocol. See Section C.34.11.1.​

 

 

 

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

>ProtocolElementNumber​

(0018,9921)​

1​

The Protocol Element Number of the Reconstruction Protocol Element​

 

 

 

being specified in this Item.​

>Parameters Specification​

(0018,9913)​

3​

Constraints on reconstruction parameters.​

Sequence​

 

 

One or more Items are permitted in this Sequence.​

 

 

 

>>IncludeTable10.25-1“AttributeValueConstraintMacro​Only Attributes defined in Table C.34.12-1 (i.e., in the Reconstruction​ Attributes”​ Protocol Element Sequence (0018,9934) in the Performed CT​

Reconstruction Module) and Private Data Elements associated with this​ reconstruction protocol element may be specified as Selector Attributes.​

ThesemanticsofvaluesofConstraintViolationSignificance(0082,0036)​ in the Macro are assigned in Section C.34.9.3.​

The same Attribute shall not appear in more than one Item in the​ Sequence with the same values for Selector Sequence Pointer​ (0072,0052) and Selector Sequence Pointer Items (0074,1057).​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1579​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>>Modifiable Constraint​

(0082,0038)​

1C​

Whether this constraint may be encoded in a derived instance with a​

Flag​

 

 

different value. See Section C.34.9.4.​

 

Requirediftheconstraintmaynotbemodified,maybepresentotherwise.​

Enumerated Values:​

YES​The constraint may be modified.​

NO​ The constraint may not be modified.​

Attributes that might commonly be specified here include:​

•​Reconstruction Algorithm (0018,9315)​

•​Convolution Kernel (0018,1210)​

•​Reconstruction Diameter (0018,1100)​

•​Slice Thickness (0018,0050)​

•​Pixel Spacing (0028,0030)​

C.34.11.1 Reconstruction Protocol Elements​

A CT Protocol frequently specifies multiple reconstructions. For example, a single helical Acquisition Protocol Element may be recon-​ structed once as thin slices and a second time as thick slices.​

C.34.12 Performed CT Reconstruction Module​

This Module contains reconstruction parameter values for a performed CT imaging procedure.​

This Module contains Attributes that affect machine behavior but not those that are merely descriptive. The latter may be found in the​ reconstructed images.​

Table C.34.12-1. Performed CT Reconstruction Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Reconstruction Protocol​

(0018,9934)​

1​

Parameter values for each reconstruction protocol element in the​

Element Sequence​

 

 

Protocol. See Section C.34.11.1. Elements are performed in the order​

 

 

 

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

 

 

 

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

>Include Table 10.28-1 “Protocol Element Identification​

 

Macro Attributes”​

 

 

 

>Source Acquisition​

(0018,9938)​

1​

A value corresponding to the Protocol Element Number (0018,9921) of​

Protocol Element Number​

 

 

the Acquisition Protocol Element from this Protocol being reconstructed​

 

 

 

in this reconstruction protocol element.​

 

 

 

Thismaybemulti-valuedifmultipleacquisitionsarecombinedinasingle​

 

 

 

reconstruction protocol element.​

>SourceAcquisitionBeam​

(0018,9939)​

1​

One or more values corresponding to the Beam Number (300A,00C0)​

Number​

 

 

in the Acquisition Protocol Element (specified in Source Acquisition​

 

 

 

Protocol Element Number (0018,9938) ) from which data was used in​

 

 

 

this reconstruction protocol element.​

- Standard -​

Page 1580​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Referenced SOP Class​

(0008,1150)​

1C​

Uniquely identifies the referenced SOP Class.​

UID​

 

 

Required if the referenced acquisition protocol element is not in this​

 

 

 

 

 

 

instance.​

 

 

 

Shall have a value of 1.2.840.10008.5.1.4.1.1.200.2 (CT Performed​

 

 

 

Procedure Protocol Storage).​

>Referenced SOP​

(0008,1155)​

1C​

The UID of the instance containing the acquisition protocol element​

Instance UID​

 

 

referencedinSourceAcquisitionProtocolElementNumber(0018,9938).​

 

 

 

Required if the referenced acquisition protocol element is not in this​

 

 

 

instance.​

>Reconstruction Start​

(0018,993B)​

1​

Anatomically oriented transverse location where this reconstruction​

Location Sequence​

 

 

starts.​

 

 

 

Note​

 

 

 

1.​This represents the start of the data used in the​

 

 

 

reconstruction,notnecessarilytheslicelocationofthefirst​

 

 

 

reconstructed slice.​

 

 

 

2.​This represents the intended start location. The operator​

 

 

 

may or may not have selected a location that exactly​

 

 

 

matches this anatomical location.​

 

 

 

3.​In the case where an anatomical reference basis cannot​

 

 

 

be determined or derived from the Defined Protocol​

 

 

 

instance, for example when an ad hoc reconstruction is​

 

 

 

beingperformed,theimplementationmayusetheacquired​

 

 

 

volume (128160, DCM, "Acquired Volume") as the​

 

 

 

reference basis with an appropriate offset.​

 

 

 

Only a single Item is permitted in the Sequence.​

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

BCID1000“CTTransversePlaneReferenceBasis”forReferenceBasis​

Attributes”​

 

 

Code Sequence (0018,9902)​

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

Code Sequence (0018,9903)​

- Standard -​

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