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Fig. 6. —Bar graph shows qualitative values for sharpness of aortic arch and great vessel origins are consistently higher for images in breath-hold group than for images in non-breath-hold group. (Sharpness was rated on scale 0-5, with 5 = excellent.) No significant difference in vessel sharpness of carotid bifurcations between two groups was noted. Values for sharpness of great vessel origins have been averaged for all three vessels. [UNK] = non—breath-hold, = breath-hold.