Search

Chunqi S Qian

from Okemos, MI
Age ~45
Get Report
Also known as:
Qian Chunqi
Related to:
Jiamu Hu, 56Song Qian, 60Wei Qian, 44
Connected to:
Cen QianChelsea H Qian, 57Crystal Qian, 29Elaine Y Qian, 61Fangzheng Qian, 33Feliks Qian, 57Flora F Qian, 51Guoqiang Qian, 56Haohua Qian, 61Haoli Qian, 47

Chunqi Qian Phones & Addresses

  • Okemos, MI
  • Rockville, MD
  • Tallahassee, FL
  • Irvine, CA
  • Bethesda, MD
  • Albany, CA

Publications

Us Patents

Wirelessly Powered Mri Signal Amplification System And Method

View page
US Patent:
20140066753, Mar 6, 2014
Filed:
Mar 29, 2012
Appl. No.:
14/008133
Inventors:
Chunqi Qian - Rockville MD, US
Alan Koretsky - Bethesda MD, US
Stephen John Dodd - Bethesda MD, US
Assignee:
The Government of The United States of America, as represented by the Secretary, Department of Healt - Bethesda MD
International Classification:
G01R 33/36
US Classification:
600421
Abstract:
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.

Impedance Matching In Nmr Probe With An Adjustable Segmented Transmission Line

View page
US Patent:
8525518, Sep 3, 2013
Filed:
Oct 26, 2009
Appl. No.:
12/605761
Inventors:
Chunqi Qian - Tallahassee FL, US
Assignee:
The Florida State University Research Foundation, Inc. - Tallahassee FL
International Classification:
G01V 3/00
US Classification:
324322, 324318
Abstract:
Impedance matching between the RF probe and the spectrometer is a standard requirement for NMR probes. Both lumped element and branched transmission line methods are in wide use. Here we propose to use a segmented transmission line structure. It relies upon reflections between transmission lines of different impedances that are serially connected to match the impedance of a coil or resonator to the characteristic impedance of the NMR spectrometer. In an embodiment, two quarter-wave length dielectric slugs are placed within a coaxial transmission line. Adjustment of the positions of the slugs allows the variable tuning and matching needed for NMR probes, eliminating the need for variable capacitors and inductors.

Negative Resistance Preamplifier For Inductively Coupled Local Mri Coils

View page
US Patent:
20170067974, Mar 9, 2017
Filed:
May 7, 2015
Appl. No.:
15/309336
Inventors:
Joseph A. Murphy-Boesch - Rockville MD, US
Stephen Dodd - Rockville MD, US
Chunqi Qian - Rockville MD, US
Alan Koretsky - Rockville MD, US
- Rockville MD, US
International Classification:
G01R 33/36
G01R 33/561
Abstract:
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.
Control profile
Chunqi S Qian from Okemos, MI, age ~45 Get Report