1. A method for spatial localization of an invasive device in Magnetic Resonance Imaging (MRI) comprising: placing, in a subject to be imaged, an invasive device including at least three markers distributed as point sources defining a plane and having a chemically shifted signal source with a resonant frequency different from the chemical species of the subject to be imaged; applying a pulse sequence; detecting the resulting RF magnetic resonance signals; and determining the 3D coordinates of the at least three markers.