Patents by Inventor Hsu-Lei Lee

Hsu-Lei Lee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Preparing the magnetization state of a sample for alternating repetition time steady state free precession magnetic resonance imaging
    Patent number: 8269494
    Abstract: Techniques and systems for magnetic resonance imaging. In one aspect, preparatory pulse sequences precede alternating repetition time steady state free precession (ATR SSFP) pulse sequences to enable image acquisition before reaching a steady-state equilibrium. The design of the preparatory sequences is based on a two step process: First an oscillatory residue is expressed in terms of a window (e.g., a Kaiser-Bessel window) and scale parameters. Second the oscillatory residue is minimized to determine the scale parameters according to a desired application (e.g. ATR SSFP, optimized for fat, water, etc.) The preparation scheme described in this specification can be applied to arbitrary repetition times and RF phase cycling combinations.
    Type: Grant
    Filed: March 2, 2009
    Date of Patent: September 18, 2012
    Assignee: University of Southern California
    Inventors: Hsu-Lei Lee, Krishna S. Nayak
  • PREPARING THE MAGNETIZATION STATE OF A SAMPLE FOR ALTERNATING REPETITION TIME STEADY STATE FREE PRECESSION MAGNETIC RESONANCE IMAGING
    Publication number: 20090256563
    Abstract: Techniques and systems for magnetic resonance imaging. In one aspect, preparatory pulse sequences precede alternating repetition time steady state free precession (ATR SSFP) pulse sequences to enable image acquisition before reaching a steady-state equilibrium. The design of the preparatory sequences is based on a two step process: First an oscillatory residue is expressed in terms of a window (e.g., a Kaiser-Bessel window) and scale parameters. Second the oscillatory residue is minimized to determine the scale parameters according to a desired application (e.g. ATR SSFP, optimized for fat, water, etc.) The preparation scheme described in this specification can be applied to arbitrary repetition times and RF phase cycling combinations.
    Type: Application
    Filed: March 2, 2009
    Publication date: October 15, 2009
    Applicant: UNIVERSITY OF SOUTHERN CALIFORNIA
    Inventors: Hsu-Lei Lee, Krishna S. Nayak