Search Patents
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Patent number: 6846290Abstract: Diagnostic ultrasound is used to measure distance from a transducer to selected tissue structure. In one arrangement, the focal point of a high intensity focused ultrasound transducer is adjusted in accordance with measured distance to the selected tissue structure. In a second arrangement a transducer transport apparatus moves a transducer to maintain a selected distance from tissue structure.Type: GrantFiled: May 14, 2003Date of Patent: January 25, 2005Assignee: Riverside Research InstituteInventors: Frederic L. Lizzi, Jeffrey A. Ketterling, Robert Muratore
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Patent number: 6488626Abstract: 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: GrantFiled: April 6, 2000Date of Patent: December 3, 2002Assignee: Riverside Research InstituteInventors: Frederic L. Lizzi, Sheikh Kaisar Alam
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Patent number: 6039689Abstract: 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: GrantFiled: March 11, 1998Date of Patent: March 21, 2000Assignee: Riverside Research InstituteInventor: Frederic Lizzi
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Publication number: 20040039284Abstract: Methods are provided for enhancing the image of brachytherapy seeds implanted in tissue using a transrectal ultrasound apparatus. In a first arrangement the resonance of the seeds is determined and the seeds are insonified using acoustic signals having a resonance frequency of the seeds to cause the seeds to vibrate. The vibrating seeds have enhanced detection using a Doppler ultrasound device. In a second arrangement the acoustic signature of the seeds is determined and used to enhance the imaging of the seeds using a correlation function. In a third arrangement images are taken of the tissue and implanted seeds prior to and during the application of mechanical stress to the tissue. A correlation between the unstressed and stressed tissue can cause enhanced imaging of the seeds.Type: ApplicationFiled: March 12, 2003Publication date: February 26, 2004Applicant: Riverside Research InstituteInventors: Sheikh Kaisar Alam, Ernest Joseph Feleppa, Frederic Louis Lizzi
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Patent number: 7217242Abstract: Methods are provided for enhancing the image of brachytherapy seeds implanted in tissue using a transrectal ultrasound apparatus. In a first arrangement the resonance of the seeds is determined and the seeds are insonified using acoustic signals having a resonance frequency of the seeds to cause the seeds to vibrate. The vibrating seeds have enhanced detection using a Doppler ultrasound device. In a second arrangement the acoustic signature of the seeds is determined and used to enhance the imaging of the seeds using a correlation function. In a third arrangement images are taken of the tissue and implanted seeds prior to and during the application of mechanical stress to the tissue. A correlation between the unstressed and stressed tissue can cause enhanced imaging of the seeds.Type: GrantFiled: March 12, 2003Date of Patent: May 15, 2007Assignee: Riverside Research InstituteInventors: Sheikh Kaisar Alam, Ernest Joseph Feleppa, Frederic Louis Lizzi
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Patent number: 8152723Abstract: 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: GrantFiled: July 22, 2009Date of Patent: April 10, 2012Assignee: Riverside Research InstituteInventors: Frederic Louis Lizzi, Cheri Xiaoyu Deng
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Patent number: 6533726Abstract: 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: GrantFiled: August 8, 2000Date of Patent: March 18, 2003Assignee: Riverside Research InstituteInventors: Frederic Louis Lizzi, Cheri Xiaoyu Deng
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Patent number: 6726627Abstract: 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: GrantFiled: January 24, 2003Date of Patent: April 27, 2004Assignee: Riverside Research InstituteInventors: Frederic Louis Lizzi, Cheri Xiaoyu Deng