Curved-array ultrasonic probe using low-velocity fluid

Details Curved-array ultrasonic probe using low-velocity fluid Curved-array ultrasonic probe using low-velocity fluid

1983-11-10

1986-09-23

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73644, 128660, G01N 2900

Patent

active

046128093

ABSTRACT:
A small, simple, yet accurate probe for producing a sector scan for ultrasonic medical diagnostic apparatus is provided by positioning a curved transducer array within the probe opposite a window, and filling the probe with a fluid having an acoustic velocity on the order of 0.5.times.10.sup.5 cm/sec. This combination is made possible by forming the window from a stiff polyionomer material whose acoustic velocity is closed to that of human skin, yet which is stiff enough even when thin to be essentially non-deformable in clinical use. Grating lobes of the ultrasonic beam, as well as the scatter produced within the probe by the high reflectivity of the window material, are absorbed by coating or lining the inner side walls of the probe with an open-celled polyether urethane foam having a cell diameter slightly smaller than one wavelength of the ultrasound in the probe fluid.

REFERENCES:
patent: 4059098 (1977-11-01), Murdock
patent: 4281550 (1981-08-01), Erikson
patent: 4294119 (1981-10-01), Soldner
patent: 4389720 (1983-06-01), Miller
patent: 4391281 (1983-07-01), Green
patent: 4421118 (1983-12-01), Dow et al.

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