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. 2005 Dec;91(12):1515–1522. doi: 10.1136/hrt.2005.065979

Figure 14.

Figure 14

 During prospective gating, the scan is triggered at a defined position along the R–R interval during consecutive heart beats. Retrospective gating acquires phase data continuously throughout the cardiac cycle, allowing images to be reconstructed and viewed at any point along the R–R interval.