Ultrasonic temperature measurement apparatus

Details Ultrasonic temperature measurement apparatus Ultrasonic temperature measurement apparatus

1986-12-12

1989-04-04

Jaworski, Francis

Surgery

Truss

Pad

A61B 1000

Patent

active

048176150

ABSTRACT:
An ultrasonic diagnostic apparatus detects variations of an acoustic characteristic to obtain the fluctuation of temperature within a body to be examined. The ultrasonic diagnostic apparatus includes an ultrasonic transducer for transmitting an ultrasonic wave and receiving the reflected ultrasonic wave which is in turn converted into an electric signal. The signal is phase-detected in accordance with a plurality of gate intervals or a plurality of window interval to detect a phase difference therebetween. The relative variation of velocity dispersion before and after heating of the body is obtained on the basis of the phase variation resulting from the variation of the ultrasonic drive frequency.

REFERENCES:
patent: 3771116 (1973-11-01), Farrah
patent: 3771355 (1973-11-01), Sachs
patent: 4322974 (1982-04-01), Abele et al.
patent: 4620546 (1986-11-01), Aida et al.
patent: 4664124 (1987-05-01), Ingle et al.
Journal of the Acoustical Society of America, vol. 69, No. 6, Jun. 1981, pp. 1834-1840, Acoust. Soc. Am., New York, US; Y. Hayakawa et al.: "Multifrequency Echoscopy for Quantitative Acoustical Characterization of Living Tissues".
Journal of the Acoustical Society of America, vol. 45, No. 5, May 1969, pp. 1251-1257, New York, US; R. C. Williamson: "Echo Phase-Comparison Technique and Measurement of Sound Velocity in Water".

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