RF-SAFE INTERVENTIONAL OR NON-INTERVENTIONAL INSTRUMENT FOR USE IN AN MRI APPARATUS

摘要

An RF-safe interventional or a non-interventional instrument is disclosed for use during an MR imaging or MR examination of an examination object (A), which instrument is made of or comprises at least one longitudinal or elongated electrically conductive element (1, 3), especially in the form of a conductor or wire or line for feeding electrical signals, or in the form of the instrument itself or a component or a part thereof, which is not provided for feeding electrical signals but nevertheless electrically conductive, wherein all such elements are subject to RF common mode currents which are induced in the element when the instrument or element is exposed to an RF/MR excitation field generated during MR imaging or MR examination by means of an MR imaging apparatus. The instrument is made RF-safe by increasing the energy A loss of an oscillator which is represented by the conductor (1, 3) by means of a damping element (4; 6) in order to prevent or limit RF heating of the examination object (A) at or surrounding the conductor (1, 3).

主权项

1. An RF-safe interventional or non-interventional instrument in an MR imaging apparatus, the instrument comprising: a conductor which is subject to an RF common mode current, and at least one electrically damping element disposed at approximately a position along the conductor where an RF electric field strength of the RF common mode occurs, wherein the damping element is selected to be at least one of a resistive, a reactive or a dielectric load which attenuates or suppresses the RF common mode current or the RF electric field strength on the conductor.