1. A computer-implemented method for calibrating a motion detection system configured to carry out a motion detection technique for detecting a motion of an object during medical imaging in a medical imaging system, the computer-implemented method comprising: with an object placed in the medical imaging system in a position suitable for imaging by the imaging system, performing an automatic calibration process for determining at least one motion threshold for the object motion detection system; the automatic calibration process including: a. carrying out the motion detection technique with the motion detection system by repeatedly acquiring motion detection data enabling object motion detection and carrying out a motion quantification technique with a motion quantification system by repeatedly acquiring motion quantification data enabling object motion quantification; b. analyzing the motion quantification data for determining whether or not the object was mobile or immobile; and i. if the object was immobile, using the motion detection data for determining an object motion threshold for the motion detection system, the object motion threshold being determined by statistical analysis of the motion detection data; ii. if the object was mobile, correlating the motion quantification data with the motion detection data for determining an object motion threshold for the motion detection system, the object motion threshold being determined from the motion detection data correlated with the motion quantification data characterizing an object motion that remains within a predefined tolerance value.