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Tag persistence in human tongue at 1.5T. Left: simulation (line) and measurement (symbol) of the tag line signal for the first 1.2s after the tag module was applied. Right: contrast decay after tag module being applied. Tongue T1=850msec was measured using an inversion recovery fast spin echo (IR-FSE) sequence with multiple inversion times. The signal and contrast were normalized by the standard deviation of noise, measured by a separate scan with RF excitation turned off.
