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.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 11 Vol. 31; ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
AMPLITUDES
BOSONS
DIAGNOSTIC TECHNIQUES
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ELEMENTARY PARTICLES
FOURIER ANALYSIS
FREQUENCY RANGE
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INFRARED RADIATION
KHZ RANGE
LASERS
MASSLESS PARTICLES
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