Noninvasive vibration measurement system and method for measuring amplitude of vibration of tissue in an object being investigated
US4819649A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1986 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Nov 3, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.