Optical tomograph with photon counting and projective reconstruction of the parameters of absorbing 'phantoms' in extended scattering media

Journal Article · Sun Oct 31 04:00:00 EST 1999 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE1999V029N10ABEH001604· OSTI ID:21442652

Chursin, D A; Shuvalov, Vladimir V; Shutov, I V ^[1]

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1. International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)

A highly sensitive detection system with time-resolved photon counting was developed for modulation optical tomography (diode laser with a power of 15-30 mW, modulation frequency 100 MHz) of extended scattering objects. Experiments with model objects (linear dimensions up to 140 mm, absorption coefficients of 0.005-0.015, scattering coefficients of 1.4 mm{sup -1}) showed that the propagation of optical radiation in such media is described by a relative path-lengthening coefficient which varied in the range 1.2-4.2, depending on the absorption coefficient and on the size of the object. A rapid projection algorithm for the solution of the inverse problem was used in the reconstruction of images of strongly absorbing inclusions known as 'phantoms' (cylinders 10-23 mm in diameter). An algorithm was developed for the solution of the direct problem, which made it possible to reduce the solution time to 5-10 min. (laser applications and other topics in quantum electronics)

• OSTI ID: 21442652
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Journal Name: Quantum Electronics (Woodbury, N.Y.) Journal Issue: 10 Vol. 29; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABSORPTION
ALGORITHMS
BOSONS
DIAGNOSTIC TECHNIQUES
ELEMENTARY PARTICLES
FREQUENCY RANGE
IMAGES
LASERS
MASSLESS PARTICLES
MATHEMATICAL LOGIC
MATHEMATICAL SOLUTIONS
MHZ RANGE
MODULATION
PHOTODETECTORS
PHOTONS
RESOLUTION
SCATTERING
SORPTION
TIME RESOLUTION
TIMING PROPERTIES
TOMOGRAPHY