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1. (WO1998050781) METHOD AND APPARATUS FOR FREQUENCY ENCODED ULTRASOUND-MODULATED OPTICAL TOMOGRAPHY OF DENSE TURBID MEDIA

Pub. No.:    WO/1998/050781    International Application No.:    PCT/US1998/009250
Publication Date: Fri Nov 13 00:59:59 CET 1998 International Filing Date: Wed May 06 01:59:59 CEST 1998
IPC: A61B 5/00
G01N 21/47
G01N 29/00
G01N 29/24
G01N 29/34
Applicants: THE TEXAS A & M UNIVERSITY SYSTEM
Inventors: WANG, Lihong
Title: METHOD AND APPARATUS FOR FREQUENCY ENCODED ULTRASOUND-MODULATED OPTICAL TOMOGRAPHY OF DENSE TURBID MEDIA
Abstract:
An apparatus (10) for frequency encoded ultrasound modulated optical tomography is provided. A function generator (12) produces a frequency sweep signal which is applied to an ultrasonic transducer (20). The ultrasonic transducer (20) produces ultrasonic wave (25) in a turbid medium (21). Coherent light from a laser (22) is passed through turbid medium (21) where it is modulated by the ultrasonic wave (25). A photomultiplier tube (24) detects the light which passes through the turbid medium (21). The signal from the photomultiplier tube (24) is fed to an oscilloscope (30) and then to a computer (32) where diffecences in light intensity at different frequencies can determine the location of objects in the turbid medium (21).