This paper presents first in vivo results of a parallel transmit (PTx) system adept at regulating radiofrequency induced guidewire heating, during MRI guided interventions in sheep. The PTx system, which is an add-on to an unmodified conventional 1.5T scanner, regulates heating by operating in modes that couple/decouple the guidewire from the radiofrequency transmit array. With an inserted guidewire decoupling modes allow operation with unrestricted B1+ to safely visualize anatomy, while the coupling mode operated at low radiofrequency power provides safe visualization of the guidewire itself. Temperature measurements at the guidewire tip and in vivo images are shown.
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