Noninvasive vibration measurement system and method for measurin

Details Noninvasive vibration measurement system and method for measurin Noninvasive vibration measurement system and method for measurin

1986-11-03

1989-04-11

Jaworski, Francis

Surgery

Truss

Pad

73624, 73625, A61B 1000

Patent

active

048196495

ABSTRACT:
A system and method for measuring the acoustically induced vibrations within a living organism. The object is ensonified to set it into low frequency vibration. A continuous wave beam of ultrasonic energy is transmitted along one path and focused at the tissue to be investigated. A focused transducer receives the reflected beam along a second axis such that the intersection of the transmitted and received beams define a small, concentrated region positioned at the object under investigation. The received beam is phase modulated by the amplitude of vibration of the object producing sidebands whose amplitude can be ratioed to the amplitude of the high frequency peak to determine the absolute amplitude of the low frequency vibration.

REFERENCES:
patent: 4414850 (1983-11-01), Wiwa et al.
patent: 4543827 (1985-10-01), Tominaga
patent: 4610255 (1986-09-01), Shimura et al.
patent: 4653505 (1987-03-01), Iinuma
Signals and Systems, by Poularikas et al., pp. 219-221, PWS Publisher, 1985.

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