FFF.2.1.2.2.3 Encoding details

This section provides detailed recommendations of the key attributes to address this particular scenario.

FFF.2.1.2.2.3.1 Enhanced XA Image

Table FFF.2. 1- 19 ENHANCED X-RAY ANGIOGRAPHIC IMAGE IOD MODULES

IE Module PS 3.3 Reference Usage
Frame of Reference Synchronization C.7.4.2 Specifies that the image acquisition triggers (or is triggered by) the ECG acquisition, and that they are time synchronized.
Image Enhanced XA/XRF Image C.8.19.2 Specifies the date and time of the image acquisition. .

Table FFF.2. 1-20 ENHANCED XA IMAGE FUNCTIONAL GROUP MACROS

Functional Group Macro PS 3.3 Reference Usage
Frame Content C.7.6.16.2.2 Provides timing information of each frame.

FFF.2.1.2.2.3.1.1 Synchronization Module Recommendations

The usage of this Module is recommended to document the triggering role of the image modality.

Table FFF.2.1-21 SYNCHRONIZATION MODULE Recommendations

Attribute Name Tag Comment
Synchronization Frame of Reference UID (0020,0200) The UTC Synchronization UID “1.2.840.10008.15.1.1” is used in this case.
Synchronization Trigger (0018,106A) The value “SOURCE” is used when the image modality sends a trigger signal to the waveform modality. The value “EXTERNAL” is used when the image modality receives a trigger signal from the waveform modality.
Trigger Source or Type (0018,1061) If Synchronization Trigger (0018,106A) equals SOURCE, then ID of image equipment. If Synchronization Trigger (0018,106A) equals EXTERNAL, then ID of waveform equipment if it is known.
Acquisition Time Synchronized (0018,1800) The value “Y” is used in this scenario.
Time Source (0018,1801) The same value as in the related General ECG SOP Instance is used in this scenario.
Time Distribution Protocol (0018,1802) The value “NTP” is used in this scenario.
NTP Source Address (0018,1803) The same value as in the related General ECG SOP Instance is used in this scenario.

FFF.2.1.2.2.3.1.2 Enhanced XA/XRF Image Module Recommendations

This module includes the acquisition date and time of the image.

Table FFF.2.1-22 ENHANCED XA/XRF IMAGE MODULE Recommendations

Attribute Tag Comment
Acquisition DateTime (0008,002A) Exact date and time taken from the synchronized clock.

FFF.2.1.2.2.3.1.3 Frame Content Macro Recommendations

In this scenario the timing information does not allow relating each frame to any externally recorded waveform.

Table FFF.2.1-23 FRAME CONTENT MACRO Recommendations

Attribute Name Tag Comment
Frame Content Sequence (0020,9111)
>Frame Reference Datetime (0018,9151) Exact date and time taken from the synchronized clock.
>Frame Acquisition Datetime (0018,9074) Exact date and time taken from the synchronized clock.

FFF.2.1.2.2.3.2 Waveform Object

The recording system will take care of filling in the waveform-specific contents, based on the IOD relevant for the type of system (e.g., EP, Hemodynamic, etc.). This section will address only the specifics for attributes related to synchronization.

Table FFF.2. 1-24 Waveform IOD Modules

IE Module PS 3.3 Reference Usage
Frame of Reference Synchronization C.7.4.2 Specifies that the ECG acquisition triggers (or is triggered by) the image acquisition, and that they are time synchronized.
Waveform Waveform Identification C.10.8 Specifies the date and time of the ECG acquisition.
Waveform C.10.9 Specifies the time relationship between the trigger signal and the ECG samples.

FFF.2.1.2.2.3.2.2 Synchronization Module Recommendations

The usage of this Module is recommended to document the triggering role of the waveform modality.

Table FFF.2.1-25 SYNCHRONIZATION MODULE Recommendations

Attribute Name Tag Comment
Synchronization Frame of Reference UID (0020,0200) The UTC Synchronization UID “1.2.840.10008.15.1.1” is used in this case.
Synchronization Trigger (0018,106A) The value “EXTERNAL” is used when the waveform modality receives a trigger signal from the image modality. The value “SOURCE” is used when the waveform modality sends a trigger signal to the image modality.
Trigger Source or Type (0018,1061) If Synchronization Trigger (0018,106A) equals SOURCE, then ID of Waveform equipment. If Synchronization Trigger (0018,106A) equals EXTERNAL, then ID of image equipment if it is known.
Synchronization Channel (0018,106C) Number or ID of Synchronization channel recorded in this waveform.
Acquisition Time Synchronized (0018,1800) The value “Y” is used in this scenario.
Time Source (0018,1801) The same value as in the related image SOP Instance is used in this scenario.
Time Distribution Protocol (0018,1802) The value “NTP” is used in this scenario.
NTP Source Address (0018,1803) The same value as in the related image SOP Instance is used in this scenario.

FFF.2.1.2.2.3.2.3 Waveform Identification Module Recommendations

This module includes the acquisition date and time of the waveform, which may be different than the acquisition date and time of the image in this scenario.

Table FFF.2.1-26 WAVEFORM IDENTIFICATION MODULE Recommendations

Attribute Name Tag Comment
Acquisition Datetime (0008,002A) Exact date and time taken from the internal clock of the Waveform modality. It may be different from the acquisition datetime of the Enhanced XA SOP instance.

FFF.2.1.2.2.3.2.4 Waveform Module Recommendations

The usage of this module is recommended to encode the time relationship between the trigger signal and the ECG samples.

Table FFF.2.1-27 WAVEFORM MODULE Recommendations

Attribute Name Tag Comment
Waveform Sequence (5400,0100) Only one item is used in this application case, as all the ECG signals have the same sampling rate.
>Multiplex Group Time Offset (0018,1068) If needed, specify the Group Offset from the Acquisition Datetime.
>Waveform Originality (003A,0004) The value “ORIGINAL” is used in this scenario.
>Trigger Time Offset (0018,1069) In case the waveform recording started with a synchronization trigger from the image modality, this value allows specifying the time relationship between the trigger and the ECG samples.
>Trigger Sample Position (0018,106E) In case the waveform recording started with a synchronization trigger from the image modality, this value allows specifying the waveform sample corresponding to the trigger sent from the image modality.