Li Zhao1,
Samuel W. Fielden1, Craig H. Meyer1, 2
1Biomedical
Engineering, University of Virginia, Charlottesville, VA, United States; 2Radiology,
University of Virginia, Charlottesville, VA, United States
ASL is sensitive to motion, because of low SNR and control-label subtraction. Small blood flow changes can cause ring artifacts in multi-shot spiral ASL. The parallel reconstruction method SPIRiT removes aliasing by using multi-coil information and is proposed to reduce the artifact here. Volunteer PCASL images were reconstructed using conventional gridding method and using SPIRiT. By using SPIRiT parallel image reconstruction to reconstruct each spiral interleaf separately, the ring artifact resulting from pulsatile venous blood flow in multi-shot spiral ASL can be largely eliminated.