1. A magnetic resonance imaging (MRI) system configured to semi-automatically perform non-contrast magnetic resonance angiography (MRA), said system comprising: an MRI gantry including a static magnet, gradient magnet coils and at least one radio frequency (RF) coil defining a patient imaging region into which a patient's anatomical region of interest can be located; RF receiver and transmitter circuits coupled to said at least one RF coil; and control circuits connected to said gantry and to said RF receiver and transmitter circuits, said control circuits having an operator display and an operator control input port for configuring and operating said MRI system to acquire and process MRI data from said patient, said control circuits being configured to effect semi-automated non-contrast MRA imaging, wherein at least one of (i) a spatially selective tag pulse region and (ii) a black blood time interval (BBTI) in a non-contrast MRA data acquisition sequence are automatically determined for a predetermined patient anatomical structure.