Figure 7From: Defining the mid-diastolic imaging period for cardiac CT – lessons from tissue Doppler echocardiography Motion-free acquisition windows for the circumflex artery from the CT validation set. Substantial variation in the motion-free period exists between individual studies. The fitted average of the motion-free period is shaded. While the upper bound of the area remains relatively constant with heart rate, the lower bound increases dramatically with heart rate.Back to article page