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  • Ultrasonic sensing by induced tissue motion
    Patent number: 6488626
    Abstract: Radiation pulses from a high energy therapeutic ultrasound system are used to stimulate tissue motion by radiation pressure. The tissue motion is monitored using a diagnostic ultrasound system.
    Type: Grant
    Filed: April 6, 2000
    Date of Patent: December 3, 2002
    Assignee: Riverside Research Institute
    Inventors: Frederic L. Lizzi, Sheikh Kaisar Alam
  • Stripe electrode transducer for use with therapeutic ultrasonic radiation treatment
    Patent number: 6039689
    Abstract: A spherical cap transducer is provided with at least one electrode formed as segments. The segments are selectively driven to provide asymmetrical ovoid effective radiation patterns for treatment of tissue with ultrasonic radiation.
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: March 21, 2000
    Assignee: Riverside Research Institute
    Inventor: Frederic Lizzi
  • System and method for ultrasonic harmonic imaging for therapy guidance and monitoring
    Patent number: 6533726
    Abstract: An ultrasound system is provided which includes a therapy ultrasound transducer and a diagnostic ultrasound transducer and operates in accordance with a method to direct the application of the therapy ultrasound. The method includes operating the diagnostic ultrasound transducer to acquire a first ultrasound image; simultaneously operating the diagnostic ultrasound transducer and therapy ultrasound transducer for a second interval to acquire a second ultrasound image; and determining a difference in the first and second images indicative of the pattern of the therapy ultrasound transducer signal. The difference in the images, which result from enhanced non-linearities and propagation distortions induced by the high intensity therapy ultrasound, can be obtained by subtracting the two images.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: March 18, 2003
    Assignee: Riverside Research Institute
    Inventors: Frederic Louis Lizzi, Cheri Xiaoyu Deng
  • System and method for ultrasonic harmonic imaging for therapy guidance and monitoring
    Patent number: 6726627
    Abstract: An ultrasound system is provided which includes a therapy ultrasound transducer and a diagnostic ultrasound transducer and operates in accordance with a method to direct the application of the therapy ultrasound. The method includes operating the diagnostic ultrasound transducer to acquire a first ultrasound image; simultaneously operating the diagnostic ultrasound transducer and therapy ultrasound transducer for a second interval to acquire a second ultrasound image; and determining a difference in the first and second images indicative of the pattern of the therapy ultrasound transducer signal. The difference in the images, which result from enhanced non-linearities and propagation distortions induced by the high intensity therapy ultrasound, can be obtained by subtracting the two images.
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: April 27, 2004
    Assignee: Riverside Research Institute
    Inventors: Frederic Louis Lizzi, Cheri Xiaoyu Deng