Cardiac Triggering

Cardiac Triggering is a technique that turns RF application and image acquisition on and off based on a trigger detected within the cardiac or respiratory cycle. The Trigger Window is set as a percentage of the cardiac (or respiratory) cycle. Trigger Delay is usually set to minimum to minimize acquisition delays, unless the application requires it. Triggering synchronizes data acquisition with the waveform cycle, and all image data is acquired at the same phase in the cycle for each slice prescribed.

Spin Echo, Fast Spin Echo, Fast GRE-ET, and multi-planar 2D GRE/SPGR sequences use Cardiac Triggering.

Table 1. Image legend

Number	Description
1	Trigger Window
2	RR Interval
3	Trigger Delay
4	Slices