US Patent Application 18202577. Non-contact MRI in-bore motion sensing method using CW Doppler radar with band-pass filtering simplified abstract

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Non-contact MRI in-bore motion sensing method using CW Doppler radar with band-pass filtering

Organization Name

The Board of Trustees of the Leland Stanford Junior University

Inventor(s)

Wonje Lee of Palo Alto CA (US)

Greig C. Scott of Mountain View CA (US)

John M. Pauly of Stanford CA (US)

Shreyas S. Vasanawala of Stanford CA (US)

Non-contact MRI in-bore motion sensing method using CW Doppler radar with band-pass filtering - A simplified explanation of the abstract

This abstract first appeared for US patent application 18202577 titled 'Non-contact MRI in-bore motion sensing method using CW Doppler radar with band-pass filtering

Simplified Explanation

The patent application describes a method for detecting subject motion in a magnetic resonance imaging (MRI) apparatus using Doppler radar.

  • The method involves transmitting a continuous wave radio signal at a microwave frequency and receiving a reflected radio signal.
  • The received signal is filtered and analyzed using a quadrature radio receiver with a software defined radio implementing Doppler radar.
  • The motion of the subject is detected from the filtered reflected radio signal.
  • The system uses two antennas positioned in the bore of the MRI apparatus.
  • The first antenna is used for both transmission and reception, while the second antenna is used only for reception.
  • Band-pass filters and an RF coupler are used to connect the antennas to the quadrature radio.
  • The innovation allows for noncontact sensing of subject motion, improving the accuracy and efficiency of motion detection within an MRI apparatus.


Original Abstract Submitted

Noncontact sensing of subject motion using Doppler radar within a magnetic resonance imaging (MRI) apparatus transmits a band-pass filtered continuous wave radio signal at a microwave frequency and receives a band-pass filtered reflected radio signal. The subject motion is detected from the received band-pass filtered reflected radio signal using a quadrature radio receiver with a software defined radio implementing Doppler radar. A first antenna, used for transmission and reception, is connected to the quadrature radio using band-pass filters and an RF coupler. A second antenna, used for reception, is connected directly to the quadrature radio using band-pass filters. The antennas are positioned in a bore of the MRI apparatus.

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