Fig. 3

Standard resolution (a) and ultra-high resolution (b) radial modulation transfer function (MTF) of the 3-cm diameter pulsating disk as metric for degradation of image quality due to cardiac-induced motion of the pancreas for subject #3 (peak displacement = 1.59 mm). The dashed lines indicate the MTF of the disk at rest, and the colored lines denote the MTF of CT images at different scan start times during the R-R cycle. The inset depicts the anterior–posterior displacement of the subject (black line) and the colored rectangles denote different CT acquisition windows