CALIBRATION AND ARTEFACT MINIMIZATION IN A TWO WAVELENGTH CW DIFFUSE OPTICAL TOMOGRAPHY SYSTEM

Mihai Patachia
2013 U.P.B. Sci. Bull., Series A   unpublished
In most of the tissues, light propagation is dominated by scattering. As result, after travelling the length of a few millimetres, light propagation in tissues can be described as a diffusive process. Different tissue types have distinct scattering properties, and therefore this distinction can be imaged. Using optical measurements at multiple source-detector positions on the tissue surface, one can reconstruct the internal distribution of the absorption coefficient (µa) and the reduced
more » ... the reduced scattering coefficient (µ´s) based on the diffusion and the light transport model in a diffusive media. Measurements on phantoms are used to evaluate the performance of systems and to validate imaging algorithms. The calibration is the pivotal part of the data acquisition due to the variation in characteristics of each laser source, optical fibres, detectors and optic elements. An accurate calibration is achieved in homogeneous phantoms. The work describes how the homogeneous phantoms are used to evaluate the performance of the system and to minimize the artefacts.
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