Detunable RF reception antenna device

摘要

The invention relates to a RF reception antenna device (10) for receiving MR signals in a MR imaging system. The device (10) comprises a RF resonant circuit including a RF reception antenna (15) for picking up the MR signals, and a RF amplifier (17) connected at its input to the RF resonant circuit for amplifying the picked up MR signals. The invention proposes to make provision for a detection circuit (18) configured to derive a switching signal from an output signal of the RF amplifier (17). A switching circuit (19) is responsive to the switching signal, wherein the switching circuit (19) is configured to switch the RF resonant circuit between a resonant mode and a non-resonant (i.e. detuned) mode.

主权项

1. RF reception antenna device for receiving MR signals in a MR imaging system, the device comprising:
a RF resonant circuit including a RF reception antenna for picking up the MR signals, a RF amplifier connected at its input to the RF resonant circuit for amplifying the picked up MR signals, a detection circuit configured to derive a switching signal from an output signal of the RF amplifier, and a switching circuit responsive to the switching signal, the switching circuit being configured to switch the RF resonant circuit between a resonant mode and a non-resonant mode.