The mean difference (%) with the center position.

<p>CNR = Contrast to Noise Ratio. MTF10% = the 10% point of the modulation transfer function. Upper, Lower, Center, Anterior, Posterior, Right, and Left represent upper, lower, center, anterior, posterior, right, and left positions 1 cm offset from the center of the FOV. Measurements below the tolerance are shown in bold. The CNR, which showed over 20% difference with the center, is also marked in bold.