Ronald John Robinson

US Patent:

7600410, Oct 13, 2009

Filed:

Dec 21, 2006

Appl. No.:

11/642989

Inventors:

Prasanna Hariharan - Rockville MD, US
Ronald A. Robinson - Germantown MD, US
Matthew R. Myers - Potomac MD, US
Subha Maruvada - North Bethesda MD, US
Rupak K. Banerjee - Mason OH, US
Gerald R. Harris - Rockville MD, US

Assignee:

St. Jude Medical, Atrial Fibrillation Division, Inc. - St. Paul MN
The United States of America as represented by the Secretary Department of Health and Human Services - Washington DC
The University of Cincinnati - Cincinnati OH

International Classification:

G01V 13/00

US Classification:

73 183

Abstract:

A system for optically characterizing an acoustic beam generally includes an immersant, which is an immersion medium seeded with a plurality of seed particles that respond to illumination with fluorescence indicative of at least one parameter of the immersant such as flow or temperature. Optical transmitters illuminate the immersant slicewise, and optical receptors receive the fluorescence in order to generate a three-dimensional map of the parameter over time. A processor back-calculates one or more characteristics of an acoustic beam that results in the map. The processor initially generates a behavior model of an acoustic beam propagating in the immersant by utilizing initial guesses for the characteristics. The initial guess model is compared to the map, and an optimization routine is used to refine the initial guesses. The process repeats iteratively with refined guesses until the difference between the model and the map is minimized.

US Patent:

7787106, Aug 31, 2010

Filed:

Oct 30, 2006

Appl. No.:

11/589310

Inventors:

Ilko K. Ilev - Rockville MD, US
Ronald A. Robinson - Germantown MD, US
Ronald W. Waynant - Clarksville MD, US

Assignee:

The United States of America as represented by the Department of Health and Human Services - Washington DC

International Classification:

G01P 3/36

US Classification:

356 27, 356 28

Abstract:

An illumination system for a particle image velocimetry system has an illumination source, a hollow tapered optical funnel arranged to receive illumination light from the illumination source, a hollow optical waveguide optically coupled to an output end of the hollow tapered optical funnel, and a beam shaping optical system optically coupled to an output end of the hollow optical waveguide. The illumination system is constructed to provide a light sheet to illuminate particles within a fluid under observation. A particle image velocimetry system has such an illumination system.

US Patent:

50529340, Oct 1, 1991

Filed:

Apr 20, 1990

Appl. No.:

7/513269

Inventors:

Ronald F. Carey - Columbia MD
Bruce A. Herman - Rockville MD
Ronald A. Robinson - Germantown MD
Harold F. Stewart - Nashville TN
Richard G. Hoops - Potomac MD
George H. Douglas - Mt. Airy MD

Assignee:

The United States of America as represented by the Department of Health
and Human Services - Washington DC

International Classification:

G09B 2378
A61B 800

US Classification:

434268

Abstract:

Apparatus is provided to serve as a phantom for evaluation of prosthetic valves and cardiac ultrasound procedures, wherein a controlled pulsatile flow of a blood-mimicking fluid is passed through a multi-chambered region into which are mounted mitral and aortic valves and adjustably positionable ultrasound transducers. A low friction, drive which involves very low levels of extraneous vibrational inputs, is provided with adjustment of both the volume flow rate of blood-mimicking fluid moved in each operational pulse with further control provided by relatively easily adjusted screws to selectively regulate the systolic and diastolic times of the pulsatile flow generated by a bellows arrangement. Windows made of silicone elastomer material presenting both tissue-equivalent impedance for ultrasound transmission and tissue-equivalent attenuation of the ultrasound are provided in controlled thickness to permit detailed observation of valvular flow parameters of interest, e. g. , flow velocity distributions observed in the transesophogeal and apical directions.