This work investigated the impact of three different breathing strategies, named breathhold (BH), synchronized-breathing (SB) and free-breathing (FB), together with motion detection and correction algorithms in myocardial arterial spin labeling (ASL) images. Results indicate the superiority of FB combined with pairwise registration, which showed higher accuracy (in synthetic images) and higher intrasession reproducibility together with lower variability across subjects (in in vivo images). BH and SB after motion detection provided similar results, but their practical application is more complicated as it demands the subject's collaboration to follow the respiratory pattern in SB or perform the apneas in BH.
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