We studied the test-retest reliability of assessing perforating arteries of the BG with 2D-PC velocity measurements at 3T-MRI, with and without repositioning of the patient. We showed reproducible assessment of Ndetected, Vmean and vPI in the perforating arteries, independent of slice planning. The relative imprecision was smallest for Vmean (12%) and highest for vPI (32%). The interrater-reliability assessment showed high consistency between two raters (mean variability <5% for all parameters). We found very similar Limits of Agreement with and without repositioning, which indicated that uncertainty in measuring these parameters was dominated by scanner and physiological noise, rather than by planning.
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