Tunable radio frequency receiving coil

JP2025514587A5Pending Publication Date: 2026-04-09KONINKLIJKE PHILIPS NV
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-04-14
Publication Date
2026-04-09

AI Technical Summary

Technical Problem

Current detuning circuits for MR receiver coils using PIN diodes face challenges in efficiently switching between tuning and detuning states, particularly with high power RF excitation pulses, which can lead to field distortion and require high control signals.

Method used

A tunable RF receiver coil assembly with an electronic detuning circuit that uses a monitor circuit electrically isolated from the detuning circuit, allowing for inductive measurement of AC current or voltage induced by the RF transmit signal, and a correlator device to correlate these measurements with the RF transmit operation state.

Benefits of technology

This solution enhances the safety of RF transmission in MR systems by accurately monitoring the detuning circuit's state, reducing the risk of field distortion, and allowing for timely detection of errors or malfunctions in the MR testing system.

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Abstract

To detect errors in a magnetic resonance inspection system, a tunable RF receiver coil assembly is provided, the RF receiver coil assembly comprising at least one RF receiver coil, an electronic detuning circuit for switching between a low noise receiving state of the tunable RF receiver coil and a passive state of the tunable RF receiver coil, and a monitor circuit, the monitor circuit being electrically isolated from and reactively coupled to the electronic detuning circuit and adapted to inductively measure an AC current or an AC voltage in the electronic detuning circuit induced by an RF transmit signal generated by the magnetic resonance inspection system, or the monitor circuit being adapted to couple to a RE signal tunable RF receiver coil, where the tunable RF receiver coil is configured to receive an RE signal coupled by a magnetic resonance preamplifier.
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