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The relative SNR (blue line) and the relative SNR per unit time (red line) of a gradient echo acquisition with constant bandwidth and echo time, and optimal flip angle as function of the ratio of TR and T1. The blue curve reflects the signal in a single shot of a gradient echo acquisition for a range of TR times, the red curve reflects the time averaged signal, showing that over a large range the increase in signal is compensated by the decrease in the number of averages.
