ACTIVE POSITION MARKER SYSTEM FOR USE IN MRI APPARATUS Russian patent published in 2017 - IPC G01R33/36 

FIELD: physics.

SUBSTANCE: invention relates to active position markers for use in a magnetic resonance imaging apparatus. Active position marker comprises a local RF receive coil for receiving local MR signals (fs), which are excited in a local volume which is surrounded by and/or surrounds local RF receive coil, wherein it comprises a parametric amplifier, provided in active position maker, for amplifying received local MR signal and for upconverting its frequency by means of a pump frequency signal (fp) into at least one upper and/or at least one lower sideband frequency signal (fp+fs, fp-fs), and at least one first antenna, provided in active position marker, for wirelessly transmitting, or a cable interface for wire-bound transmitting, at least one upper and/or at least one lower sideband frequency signal (fp+fs, fp-fs) of frequency-upconverted local MR signal.

EFFECT: high accuracy of positioning a medical instrument.

11 cl, 2 dwg