In-vivo III. a) The original perfusion frame with an artifact in the septal region, and is an example where the original boundary was exactly at a location with the most prominent DRA. b) corresponds to image a shifted in the horizontal direction by half a pixel length, showing a reduction of the artifact. Figures c-d and e-f are the respective post-FFT and pre-FFT interpolations of figures a-b. Figure 6 a, and b in the bottom, show the measured peak artifact signal loss in the regions pointed by the arrows.