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Computational calibration method for optical tomography

Tarvainen, T; Kolehmainen, V; Vauhkonen, M; Vanne, A; Gibson, AP; Schweiger, M; ... Kaipio, JP; + view all (2005) Computational calibration method for optical tomography. APPLIED OPTICS , 44 (10) 1879 - 1888.

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Abstract

We propose a computational calibration method for optical tomography. The model of the calibration scheme is based on the rotation symmetry of source and detector positions in the measurement setup. The relative amplitude losses and phase shifts at the optic fibers are modeled by complex-valued coupling coefficients. The coupling coefficients can be estimated when optical tomography data from a homogeneous and isotropic object are given. Once these coupling coefficients have been estimated, any data measured with the same measurement setup can be corrected for the relative variation in the data due to source and detector losses. The final calibration of the data for the source and detector losses and the source calibration between the data and the forward model are obtained as part of the initial estimation for reconstruction. The calibration method was tested with simulations and measurements. The results show that the coupling coefficients of the sources and detectors can be estimated with good accuracy. Furthermore, the results show that the method can significantly improve the quality of reconstructed images. (c) 2005 Optical Society of America.

Type:Article
Title:Computational calibration method for optical tomography
Location:Miami Beach, FL
Keywords:FINITE-ELEMENT-METHOD, SCATTERING MEDIA, DIFFUSION TOMOGRAPHY, BREAST, INSTRUMENTATION, PROPAGATION, SYSTEM, BRAIN, LIGHT
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Computer Science
UCL > School of BEAMS > Faculty of Engineering Science > Medical Physics and Bioengineering

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