Meeting Banner
Abstract #3032

Pulsatile Motion Artifact Correction in Multishot Spiral PCASL

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.

Abstract PDF Presentation Video

Keywords

acquisition added addition alternated alternating amplitude arbitrary arrow arterial artifact artifacts averaging background balanced biomedical blood bolus bulk cardiac cause centric coil collected complex component consistent constant control corrected correction cycle degrees delay density dependent duration either eliminate eliminated encoding engineering excitation exploit final flow form gradient ignored improved inconsistency inconsistent inserted intensity interleaves iterative label labeling largely magnitude make manifests motion negative object pair parallel perfusion post prior processed pulsates pulse pulses radiology readout reconstruct reconstructed reconstruction reduce reduced redundant refocusing registration remains resolution ring scanned scanners schemes self sensitive separately shot significantly sinus slab slice slices space spin spiral spirals spirit stack subject subtracted subtraction suppression tagging together train trio venous visible volunteers yields