Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published February 1, 2000 | Published
Journal Article Open

Theoretical and experimental studies of ultrasound-modulated optical tomography in biological tissue


Ultrasound-modulated optical tomography in biological tissue was studied both theoretically and experimentally. An ultrasonic beam was focused into biological tissue samples to modulate the laser light passing through the ultrasonic beam inside the tissue. The ultrasound-modulated laser light reflects the local optical and mechanical properties in the ultrasonic beam and permits tomographic imaging of biological tissues by scanning. Parallel detection of the speckle field formed by the transmitted laser light was implemented with the source-synchronous-illumination lock-in technique to improve the signal-to-noise ratio. Two-dimensional images of biological tissues were successfully obtained experimentally with a laser beam at either normal or oblique incidence, which showed that ultrasound-modulated optical tomography depends on diffuse light rather than on ballistic light. Monte Carlo simulations showed that the modulation depth decreased much more slowly than the diffuse transmittance, which indicated the possibility that even thicker biological tissues can be imaged with this technique.

Additional Information

© 2000 Optical Society of America. Received 21 July 1999; revised manuscript received 29 September 1999. This project was sponsored in part by National Institutes of Health grants R29 CA68562, R01 CA71980, and R21 CA83760 and by National Science Foundation grant BES-9734491.

Attached Files

Published - ao-39-4-659.pdf


Files (1.2 MB)
Name Size Download all
1.2 MB Preview Download

Additional details

August 19, 2023
October 24, 2023