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(0018,9920) Acquisition Protocol Element Sequence2Sequence
(0018,1120) Gantry/Detector Tilt1Decimal String
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(0018,9325) CT X-Ray Details Sequence1Sequence
(0018,0060) KVP1Decimal String
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(0018,1064) Cardiac Framing Type1CLong String
(0018,1081) Low R-R Value2CInteger String
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(0018,1086) Skip Beats3Integer String
(0018,1160) Filter Type1Short String
(0018,1190) Focal Spot(s)1Decimal String
(0018,9037) Cardiac Synchronization Technique1Code String
(0018,9070) Cardiac R-R Interval Specified1CDouble
(0018,9085) Cardiac Signal Source1CCode String
(0018,9169) Cardiac Beat Rejection Technique1CCode String
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Cardiac Synchronization Technique Attribute

Tag(0018,9037)
TypeRequired (1)
KeywordCardiacSynchronizationTechnique
Value Multiplicity1
Value RepresentationCode String (CS)

Cardiac synchronization technique applied during acquisition or processing.

Enumerated Values:

NONE

REALTIME

PROSPECTIVE

RETROSPECTIVE

PACED

See Section C.7.6.18.1.

Section C.7.6.18.1

C.7.6.18.1 Cardiac Synchronization Module

Table C.7.6.18-1 specifies the Attributes of the Cardiac Synchronization Module.

Table C.7.6.18-1. Cardiac Synchronization Module Attributes

Attribute Name

Tag

Type

Attribute Description

Cardiac Synchronization Technique

(0018,9037)

1C

Defines if a cardiac synchronization technique was applied during or after the acquisition.

Enumerated Values:

NONE

REALTIME

total time for the acquisition is shorter than cardiac cycle, no gating is applied

PROSPECTIVE

certain thresholds have been set for a gating window that defines the acceptance of measurement data during the acquisition

RETROSPECTIVE

certain thresholds have been set for a gating window that defines the acceptance of measurement data after the acquisition

PACED

there is a constant RR interval (e.g., Pacemaker), which makes thresholding not required

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Cardiac Signal Source

(0018,9085)

1C

Cardiac Signal Source.

Defined Terms:

ECG

electrocardiogram

VCG

vector cardiogram

PP

peripheral pulse

MR

magnetic resonance, i.e., M-mode or cardiac navigator

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Cardiac Synchronization Technique (0018,9037) equals other than NONE.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and Cardiac Synchronization Technique (0018,9037) equals other than NONE.

Cardiac RR Interval Specified

(0018,9070)

1C

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

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Cardiac Synchronization Technique (0018,9037) equals other than NONE.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and Cardiac Synchronization Technique (0018,9037) equals other than NONE.

Note

Heart Rate (0018,1088) is not used in this Module, since its value can be derived as 1/ Cardiac RR Interval Specified (0018,9070).

Cardiac Beat Rejection Technique

(0018,9169)

1C

Cardiac arrhythmia rejection 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 Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Cardiac Synchronization Technique (0018,9037) equals PROSPECTIVE or RETROSPECTIVE.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and 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 Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Cardiac Synchronization Technique (0018,9037) equals PROSPECTIVE or RETROSPECTIVE.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and 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 Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Cardiac Synchronization Technique (0018,9037) equals PROSPECTIVE or RETROSPECTIVE.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and Cardiac Synchronization Technique (0018,9037) equals PROSPECTIVE or RETROSPECTIVE.

Intervals Acquired

(0018,1083)

2C

Number of R-R intervals acquired and used to create the image (not including the intervals rejected).

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Cardiac Synchronization Technique (0018,9037) equals other than NONE.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and Cardiac Synchronization Technique (0018,9037) equals other than NONE.

Intervals Rejected

(0018,1084)

2C

Number of R-R intervals rejected.

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Cardiac Synchronization Technique (0018,9037) equals other than NONE.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and Cardiac Synchronization Technique (0018,9037) equals other than NONE.

Skip Beats

(0018,1086)

3

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

Cardiac Framing Type

(0018,1064)

1C

Description of 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.

Note

Low R-R Value (0018,1081), High R-R Value (0018,1082), Intervals Acquired (0018,1083) and Intervals Rejected (0018,1084) in this Module apply to the entire Image. The Cardiac Synchronization Sequence (0018,9118) in the Cardiac Synchronization Functional Group uses the same Attributes and specifies the values for a single frame.

C.7.6.18.1.1 Cardiac Synchronization Module Attribute Descriptions
C.7.6.18.1.1.1 Cardiac Framing Type

Cardiac Framing Type (0018,1064) is the mechanism used to select the data acquired to construct the frames within a specified cardiac timing interval.

Defined Terms:

FORW

time forward from trigger

BACK

time back before trigger

PCNT

percentage of R-R forward from trigger