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Fig. 3 —Diagrams of axial CT images show simulated patients scanned with protocols A and B. Top, small patient (phantom without fat ring); middle, average-sized patient (phantom encased by one fat ring); bottom, oversized patient (phantom encased by two fat rings). As cross-sectional diameter of phantom increases, image quality is maintained in protocols A and B. Left bottom image shows region of interest placement for image noise measurement (circle).