ACTIVE POSITION MARKER SYSTEM FOR USE IN AN MRI APPARATUS

摘要

An active position marker system comprising at least one active position marker (10) and a remote transceiver unit (20) for communicating with the position marker is disclosed. Basically, the position marker (10) comprises a local RF receive coil (11) for receiving MR signals which are excited in a local volume, and a parametric amplifier (14) for amplifying and upconverting the frequency of the received MR signal into at least one microwave sideband frequency signal. This microwave signal is transmitted wirelessly or wire-bound to the transceiver unit for downconverting the same and supplying it to an image processing unit of an MR imaging apparatus.

主权项

1. Active position marker comprising:
a local RF receive coil for receiving local MR signals which are excited in a local volume which is surrounded by and/or surrounds the local RF receive coil, characterized in: a parametric amplifier, provided in the active position marker for amplifying the received local MR signal and for upconverting its frequency by means of a pump frequency signal into at least one upper and/or at least one lower sideband frequency signal, and at least one antenna, provided in the active position marker for wirelessly transmitting, or a cable interface for wire-bound transmitting, the at least one upper and/or at least one lower sideband frequency signal of the frequency-upconverted local MR signal.