Figure 1.

Geometrically systematic artifacts. Even after black-blood preparation, some flow artifacts remain. Although not obvious in the original end-systolic (ES) magnitude images (a,b), the difference between the magnitude images of end-diastole (ED) and end-systole (c,d) reveal geometrically systematic artifacts. A rotation of the field-of-view alters the characteristics of these artifacts. Both acquisitions exhibit unique artifacts in the phase-encoding direction (solid ellipses), not present in the other (dashed ellipse). In the average image (e), these artifacts are reduced. For illustrative purposes, a median filter has been applied for noise reduction in this figure. In c-e the grayscale has been exaggerated for clarity.