[Study of fluoroscopic triggering technique in 3D-dynamic contrast enhancement magnetic resonance angiography]

In the examination of 3D DCE-MRA, it is the key of success or failure to measure and compute the delaying scan time accurately. Now, the timing technique used widely in clinic is test injection bolus, which is limited by inadequate perfectibility, limited spatial resolution and technique complexity. In this article is presented a technique in which contrast arrival is detected in the targeted vasculature in real time using MR fluoroscopy. Upon detection the operator triggers a 3D MR angiographic acquisition which uses an elliptical centric view order. It is shown that the view order intrinsically provides a high degree of venous suppression, a high degree of immunity to motion effects and a high degree of spatial resolution. The reliability of fluoroscopic triggering in bolus detection is shown to be over 95%. The technique provides high quality contrast-enhanced MR angiograms for many vascular regions.