ASL based MRA with continuous labeling has the optimal label efficiency. To achieve data acquisition efficiency, a long readout train is frequently used after labeling. Flow void might appear due to the lack of tagged blood entering the imaging volume during readout. A method named hybrid ASL address this problem with additional pulsed inversion. Yet, blood inverted by pulsed ASL still experiences considerable T1 decay during readout. We propose a method termed flow enhanced ASL (FEED). Interleaved labeling modules along with segmented readout was employed. As the results show, FEED could increase the signal level without prolonging scan time.
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