highly significantp ≤ 0.001
DSA demonstrated highly significant usefulness among observers for the identification of images with no artifact (k = 0.202, p ≤ 0.001) and major artifact (k = 0.329, p ≤ 0.001), while CE-MRA was useful for the expression of minor artifacts (k = 0.953, p ≤ 0.05).