Image runs are taken by the image acquisition modality. Waveforms are recorded by waveform recording modality. Both modalities are time synchronized via NTP. The acquisition in one modality is triggered by the other modality. The resulting objects will include the time synchronization and trigger synchronization concepts.
There are two cases depending on the triggering modality:
At X-Ray start, the image modality sends a trigger signal to the waveform modality.
The waveform modality sends trigger signals to the image modality to start the acquisition of each frame.
Figure FFF.2.1- 9 Scenario of Multi-modality Waveform Synchronization