Patents by Inventor John Star-Lack

John Star-Lack 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).

  • Patent number: 6304084
    Abstract: The present invention uses spectral-spatial 180° refocusing pulses in the point resolved spectroscopy (PRESS) localization sequence. The PRESS sequence uses a series of three pulses having a tilt angle pattern of 90°-180°-180°. The first excitation pulses in the present invention is a spatially selective 90° tilt angle pulse. The following two pulses are spectral-spatial refocusing pulses which provide multi-dimensional selectivity. This feature allows for enhanced solvent suppression, reduced chemical shift induced spatial displacement and an ability to refocus weakly coupled spins. In a preferred embodiment, the spectral-spatial pulses are time-asymmetric and identical, providing for a linear phase profile by means of phase compensation between the two refocusing pulses. Alternatively, a linear phase profile can be provided by using time-symmetric refocusing pulses. The time-asymmetric feature is preferred because it results in lower applied RF power and shorter echo times.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: October 16, 2001
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: John Star-Lack, John M. Pauly, Daniel B. Vigneron