In a method and apparatus for interventional imaging in magnetic resonance tomography, a contrast agent liquid is prepared by saturation or excitation of the nuclear spins therein, such that it shows with a poor signal in the vessel system of a patient to be examined after injection, or the stationary tissue is prepared by saturation or excitation of the nuclear spins therein such that the contrast agent liquid shows with strong signal (compared to the tissue) in the vessel system of a patient to be examined after injection.