“…A maximum monitor period, ranging from 6-12 seconds, can be set as a failsafe mechanism, in the instance that the "tracker" does not detect contrast arrival. 3,8,[15][16][17][18] Not all scanners are equipped with automated bolus detection, especially older systems. In the absence of the option, a large field-of-view sequence including the chest can be reconstructed and displayed in real time, so that the MR technologist can use visual cues, such as right atrial opacification, for providing breath-hold instructions and initiating image acquisition.…”