The United States of America, As Represented by the Secretary, Department of Health and Human Services

Chunqi Qian

Stephen Dodd

Alan Koretsky

Joe Murphy-Boesch

Joseph A Murphy-Boesch

Stephen John Dodd

A novel MRI-compatible amplifier design uses positive feedback from a low-noise Field-Effect Transistor to amplify the signal current within a resonant NMR coil. The amplified signal current in this low-power circuit produces RF flux can be coupled out to receiving loops positioned externally without significant loss in sensitivity. In other aspects, the amplifier may be remotely powered by external resonant loops, a small non-magnetic battery, or optical power, such that the NMR coil can be positioned during highly invasive procedures such as for surgical resection of tumors in deep-lying tissues to develop high-resolution images.

Negative resistance preamplifier for inductively coupled local MRI coils

An implantable parametric circuit enables local signal amplification and wireless transmission of RF signals in connection with magnetic resonance imaging systems. The parametric circuit detects RF signal detected during magnetic resonance imaging procedure, amplifies the detected RF signal, and transmits the amplified RF signal in a wireless manner to an external pick-up coil. The parametric amplifier is also configured to use another RF signal generated by an external source as the primary power source. As a result, implanted or catheter coils could be used as a wireless signal transducer without the need for a battery or a power connection.

Wirelessly powered magnetic resonance imaging signal amplification system for ingestible devices having L-C mesh circuit

Wirelessly powered magnetic resonance imaging signal amplification system

Growing community of inventors

Rockville, MD, United States of America

Chunqi Qian