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Published August 18, 1997 | Published
Book Section - Chapter Open

Ultrasonic modulation of diffuse light in turbid media


Continuous-wave ultrasonic modulation of laser light has been used to image objects buried in tissue-simulating turbid media. The ultrasonic wave focused into the turbid media modulated the laser light passing through the ultrasonic field. The modulated laser light collected by a photomultiplier tube reflected primarily the local mechanical and optical properties in the focal zone. Modulated signal was estimated using diffusion theory. The dependence of the ultrasound-modulated optical signal on the off-axis distance of the detector from the optic axis was studied. The mechanisms of ultrasonic modulation of light were discussed.

Additional Information

© 1997 Society of Photo-Optical Instrumentation Engineers (SPIE). This project was sponsored in part by the National Institutes of Health grant R29 CA68562 and The Whitaker Foundation.

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