See Synchronization Prospective.

Acquiring images of particular phases of the cardiac cycle, through either retrospective or prospective synchronization. Also called cardiac gating.

Controlling the timing or sequence of image data acquisition according to the phase of respiratory or cardiac cycles.

Synchronization of imaging with a phase of the cardiac or respiratory cycles.
A variety of means for detecting these cycles can be used, such as the ECG, peripheral pulse, chest motion, etc. The synchronization can be prospective or retrospective.