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Axial images and volume-rendered images from scans with 140 kV, 200 mAs per rotation [CTDIvol = 110 mGy (a) and (c)] and 120 kV, 50 mAs per rotation [CTDIvol = 18 mGy (b) and (d)]. Sufficient image quality is maintained in the low dose scan [(b) and (d)] to diagnose join instability with confidence.
