Acousto-optic tomography using amplitude-modulated focused ultrasound and a near-IR laser
- Institute of Laser Life Science, South China Normal University, Guangzhou (China)
A novel tomographic method that can be applied in strongly scattering optical media is proposed. 1-MHz focused ultrasound is used to tag the scattering photons in the biological tissue; it carries a 10-KHz sinusoidal wave to act as a detection wave through amplitude-modulation (AM). The scattering photons that come from the focused zone carry the modulated information. Their optoelectronic signal is demodulated by real-time FFT. By detecting and discriminating ultrasound-modulated information carried by scattered photons, the optical tomographic images of the media simulating biological tissue and of a buried object are reconstructed by the AM spectral intensity. This ultrasound-tagged optical tomography can be applied to tissue structures with different optical parameters. For the first time, by using this method, we obtained the tomographic image of a 5 mm-wide soft rubber cube buried in a biological tissue-simulating media with a detecting depth of 30 mm. (laser applications and other topics in quantum electronics)
- OSTI ID:
- 21448403
- Journal Information:
- Quantum Electronics (Woodbury, N.Y.), Vol. 31, Issue 11; Other Information: DOI: 10.1070/QE2001v031n11ABEH002095; ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
AMPLITUDES
FOURIER ANALYSIS
IMAGES
KHZ RANGE
LASERS
MHZ RANGE
MODULATION
NEAR INFRARED RADIATION
PHOTONS
RUBBERS
SCATTERING
SIGNALS
TOMOGRAPHY
ULTRASONIC WAVES
BOSONS
DIAGNOSTIC TECHNIQUES
ELASTOMERS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FREQUENCY RANGE
INFRARED RADIATION
MASSLESS PARTICLES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
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