Albert Waxman

US Patent:

44248130, Jan 10, 1984

Filed:

Aug 14, 1981

Appl. No.:

6/292948

Inventors:

James F. Havlice - Los Altos CA
Albert S. Waxman - Los Gatos CA
Henry L. Schwartz - Los Gatos CA
David E. Stepner - Cupertino CA

Assignee:

Diasonics, Inc. - Milpitas CA

International Classification:

G01N 2904

US Classification:

128660

Abstract:

A multi-mode scanner head employing split (semicircular transducers) is described. In some modes such as simultaneous B-scan and M-scan each transducer moves independent of the other. For continuous Doppler mode the transducers move together. The relatively small, hand-held scanner head is particularly useful for cardiac examinations.

US Patent:

40514064, Sep 27, 1977

Filed:

Sep 24, 1975

Appl. No.:

5/616125

Inventors:

Albert S. Waxman - Santa Clara CA

Assignee:

Princeton Electronic Products, Inc. - North Brunswick NJ

International Classification:

H01J 2941
H01J 3108

US Classification:

313391

Abstract:

A target for electronic storage tubes of the non-direct viewing type having a target comprised of substantially coplanar insulating and conducting areas wherein the insulating area is provided on one face of the conducting area in a predetermined and preferably striped pattern. The insulating pattern is comprised of at least a layer of ionizing radiation insensitive material taken from the group of materials comprised of silicon nitride, silicon oxynitride, aluminum oxide.

US Patent:

42313732, Nov 4, 1980

Filed:

Jul 18, 1978

Appl. No.:

5/925701

Inventors:

Albert S. Waxman - Los Gatos CA
James F. Havlice - Los Altos CA

Assignee:

Diasonics - Sunnyvale CA

International Classification:

A61B 1000

US Classification:

128660

Abstract:

A data acquisition head for an ultrasonic imaging system which employs a plurality of transducers is disclosed. The transducers are rotated in a liquid filled chamber at a constant rate, each about an axis perpendicular to its transmission axis. The transducers are sequentially activated as their transmission axes cross a semi-rigid membrane which is in contact with the body. The acoustic impedance of the liquid and membrane, and the thickness of the membrane, are matched to enhance transmission. In one embodiment, the membrane is one-half or a full wavelength thick and comprises a low density polyethylene and the liquid has an acoustic impedance approximately equal to that of the polyethylene.

US Patent:

44108265, Oct 18, 1983

Filed:

Apr 12, 1982

Appl. No.:

6/367766

Inventors:

Albert S. Waxman - Los Gatos CA
James F. Havlice - Los Altos CA

Assignee:

Diasonics, Inc. - Milpitas CA

International Classification:

H01L 4108

US Classification:

310336

Abstract:

A data acquisition head for an ultrasonic imaging system which employs a plurality of transducers is disclosed. The transducers are rotated in a liquid filled chamber at a constant rate, each about an axis perpendicular to its transmission axis. The transducers are sequentially activated as their transmission axes cross a semi-rigid membrane which is in contact with the body. The acoustic impedance of the liquid and membrane, and the thickness of the membrane, are matched to enhance transmission. In one embodiment, the membrane is one-half or a full wavelength thick and comprises a low density polyethylene and the liquid has an acoustic impedance approximately equal to that of the polyethylene.

US Patent:

40580016, Nov 15, 1977

Filed:

Aug 2, 1976

Appl. No.:

5/710942

Inventors:

Albert S. Waxman - Santa Clara CA

Assignee:

G. D. Searle & Co. - Skokie IL

International Classification:

G01N 2900
A61B 1000

US Classification:

73620

Abstract:

In an improved system for medical imaging employing a transducer for transmitting and detecting ultrasonic vibrations, a digital scan converter accepts echo signals detected by the transducer and transducer position signals identifying the point of origin of the signals in a scanning plane transversely oriented relative to the body of the patient under study. The amplitudes of the echoes detected are stored at memory locations associated with the points of origin of the echoes. Peak detection analysis is performed on large echoes emanating from higher impedance tissue interfaces within the scanning plane, while cumulation and normalization analysis is performed on small echoes emanating from low impedance tissue interfaces within the scanning plane. Sensitivity to otherwise unobtainable image details, signal to noise ratio, and freedom from distortions is maximized, yet the improved system may be used.