Fig. 5.

Aorta localization. a Uncropped MAG series MRI frame, showing 0–1 normalized, per pixel standard deviation. b Green box is a zoom of the heart region and the red box corresponds to the aorta—the highest weighted pixel area in the image. c A box and whisker plot of per-frame standard deviations for all 4239 MRI sequences in the weak training set. Here the blue box represents the interquartile range of the first and third quartiles, the black line is the median value, and the whiskers map to the minimum and maximum values across all frames at a given index. Note the most variation occurs in the first 15 frames