Direct opto-acoustic in vitro measurement of the spatial distribution of laser radiation in biological media
- International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)
The problem of opto-acoustic (AO) diagnostics of light scattering and absorption in biological media is considered. The objects under study were milk, bovine and porcine liver, and bovine muscle tissue. The forward and backward schemes for recording acoustic signals were used in experiments. The spatial distribution of the light intensity was measured for each biological medium from the temporal profile of the excited OA pulse and the absorption coefficient and reduced scattering coefficient were determined. Opto-acoustic signals were excited by a 1064-nm pulsed Nd:YAG laser and a tunable Ti:sapphire laser at 779 nm. It is shown that the proposed method can be used for obtaining a priori information on a biological medium in problems of optical and AO tomography. (special issue devoted to multiple radiation scattering in random media)
- OSTI ID:
- 21456921
- Journal Information:
- Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 12 Vol. 36; ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACOUSTIC MEASUREMENTS
ANIMALS
BIOLOGICAL MATERIALS
BODY
BODY FLUIDS
CATTLE
CORUNDUM
DIAGNOSTIC TECHNIQUES
DIGESTIVE SYSTEM
DISTRIBUTION
DOMESTIC ANIMALS
ELECTROMAGNETIC RADIATION
FOOD
GLANDS
IN VITRO
LASER RADIATION
LASERS
LIGHT SCATTERING
LIVER
MAMMALS
MATERIALS
MILK
MINERALS
MUSCLES
NEODYMIUM LASERS
ORGANS
OXIDE MINERALS
PHOTOACOUSTIC SPECTROSCOPY
PULSES
RADIATIONS
RUMINANTS
SAPPHIRE
SCATTERING
SIGNALS
SOLID STATE LASERS
SPATIAL DISTRIBUTION
SPECTROSCOPY
TOMOGRAPHY
VERTEBRATES
VISIBLE RADIATION