Targeted traveling wave MRI

摘要

The present invention relates to a travelling wave MRI apparatus which comprises a coaxial waveguide arrangement consisting of a continuous cylindrical outer shield and two axially spaced apart hollow cylindrical inner conductive tubes between which the investigation area is located. For reducing the attenuation of the travelling wave in portions of a patient outside the region of interest, and thereby reducing also the global SAR, unexposed portions of the patient are positioned in the hollow interior of the inner conductive tubes so as to shield them from the propagating wave.