Magnetic resonance imaging guidewire probe

A probe assembly for wire suitable for receiving magnetic resonance signals from a sample, comprising guide: an axis of probe (105) with a distal end (109) and a proximal end (111), wherein the axis of the probe It includes an electrically conductive core (101) of nonmagnetic material; a first insulation around (102) of said core; electrically conductive shielding (103) around at least part of said insulator; and RF antenna (106) attached to said core at the distal end of said probe shaft; said antenna being visible on a magnetic resonance image, characterized in that the antenna includes an antenna helical whip without loop with multiple turns.