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(0020,9249) Ending Respiratory Phase1CCode String
(0020,9254) Respiratory Interval Time1CDouble
(0020,9255) Nominal Respiratory Trigger Delay Time1Double
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Data synced with official DICOM standard on 18 April 2024. The DICOM Standard is under continuous maintenance, and the current official version is available at http://www.dicomstandard.org/current/. DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

Actual Respiratory Trigger Delay Time Attribute

Tag(0020,9257)
TypeConditionally Required (1C)
KeywordActualRespiratoryTriggerDelayTime
Value Multiplicity1
Value RepresentationDouble (FD)

The actual time in ms from the beginning of the respiratory interval to the value of Frame Reference DateTime (0018,9151). See Section C.7.6.16.2.17.1 for further explanation.

Required if Respiratory Trigger Type (0020,9250) is TIME or BOTH.

Note

Part of the Respiratory Synchronization Functional Group Macro with usage: C

Required if Respiratory Motion Compensation Technique (0018,9170) equals other than NONE, REALTIME or BREATH_HOLD and if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Section C.7.6.16.2.17.1

C.7.6.16.2.17.1 Relationship of Respiratory Timing Attributes

For time based respiratory gating, the Nominal Respiratory Trigger Delay Time (0020,9255) is the prescribed trigger delay time in ms from the previous Respiratory-peak to the value of Frame Reference DateTime (0018,9151). When frames are acquired with prospective gating, that is, the data acquisition actually begins in response to a timed delay from the Respiratory trigger, it may be that Actual Respiratory Trigger Delay Time (0020,9257) and the Nominal Respiratory Trigger Delay Time (0020,9255) have the same value.

However, when frames are the result of retrospective gating, that is, the data is continuously acquired and then later compared with a simultaneously acquired respiratory waveform and fitted into bins corresponding to nominal phases of the respiratory cycle, then Nominal Respiratory Trigger Delay Time (0020,9255) and the Actual Respiratory Trigger Delay Time (0020,9257) may have different values.

Figure C.7.6.16-9a and Figure C.7.6.16-9b depict the usage.

Figure C.7.6.16-9a. Respiratory Timing Tags


Figure C.7.6.16-9b. Relationship of Respiratory Amplitude Attributes