[The effect of periodic object movements on MRT image quality]

Object movement influences the images in MRT, producing phantom images and blurred contours, while also affecting the intensity of the signal. Phantom images and blurring of contours can be largely prevented by suitable signal triggering in case of rhythmic movements caused, for example, by cardiac pulsation or respiration. However, the intensity of the signal follows a different pattern. Periodic movement in the image plane (sagittal plane) has no effect on signal intensity if the exposures are triggered. Object movement across the image plane causes changes in signal intensity, even with triggered exposures.