Table 1.

4-point Likert scale scores used in the evaluation of the artifacts and image quality.

Score	Artifacts (source image)	Image quality (perfusion maps)
0	Totally obscured: Anatomy is not visible	Worst: very poor
1	Severe: Strong artifacts and limited evaluation of anatomical structures	Poor
2	Moderate: Artifacts present, but assessment of anatomical structures is not impaired	Fair
3	None to very mild	Best: good to excellent