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Example images of tag fading with imaging flip angle of 3°, 5° and 7°. Wide tag spacing of 5 cm was used to mitigate partial volume effects. At around 700 msec (4th column), FA=3°, 5° have similar CNR, while the latter has 30% higher SNR. As an overall consideration, we used flip angle of 5° with an imaging window of around 650–800ms, with the ending CNR of 5–6.
