Anant K Nigam

US Patent:

43334741, Jun 8, 1982

Filed:

Jun 9, 1980

Appl. No.:

6/157398

Inventors:

Anant K. Nigam - Plantation FL

Assignee:

New York Institute of Technology - Old Westbury NY

International Classification:

A61B 500

US Classification:

128660

Abstract:

The invention is directed to an ultrasonic apparatus for imaging sections of a body, including a reflective scanner. Two transducers are employed, one for transmitting and the other for receiving. The transducer used for transmitting is mounted in conjunction with the reflective scanner, and is closer to the body being examined than is the transducer used for receiving ultrasound reflected from the body being examined.

US Patent:

42079012, Jun 17, 1980

Filed:

Feb 6, 1978

Appl. No.:

5/875442

Inventors:

Anant K. Nigam - Plantation FL

Assignee:

New York Institute of Technology - Old Westbury NY

International Classification:

A61B 500

US Classification:

128660

Abstract:

A reflector is disclosed, suitable for use in an apparatus for sending and/or receiving ultrasonic energy through a propagating fluid. A thin layer of ultrasonically transmissive material is disposed on a supportive substrate having an optically rough surface. A single gaseous layer is trapped between the ultrasonically transmissive layer and the substrate, the gaseous layer being contained in the asperities of the substrate layer. The substrate is preferably a metal having a roughness in the range of 1 to 10 microns.

US Patent:

40845826, Apr 18, 1978

Filed:

Mar 11, 1976

Appl. No.:

5/665898

Inventors:

Anant K. Nigam - Plantation FL

Assignee:

New York Institute of Technology - Old Westbury NY

International Classification:

A61B 1000

US Classification:

128 2V

Abstract:

The invention is utilized in an apparatus for imaging sections of a body by transmitting ultrasonic energy into the body and determining the characteristics of the ultrasonic energy reflected therefrom. Such an apparatus typically includes a timer for generating timing signals, an energizing/receiving device alternately operative in response to the timing signals, and a display/record device, synchronized by the timing signals, for displaying and/or receiving image-representative electronic signals from the energizing/receiving device. In accordance with the invention there is provided a portable scanning module, suitable for being hand held, which comprises fluid-tight enclosure having a scanning window formed of a flexible material. A transducer is provided for converting energy from the energizing/receiving device to periodic ultrasonic energy and for converting reflected ultrasonic energy to electrical signals, the transducer having a plurality of defined segments. A variable delay device is coupled between the segments of the transducer and the energizing/receiving device, the variable delay means being responsive to the timing signals to effect electronic focusing of signals coupled therethrough.