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Journal of Biomedical Optics

Flux density calibration in diffuse optical tomographic systems
Author(s): Samir Kumar Biswas; Kanhirodan Rajan; Ram Vasu
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Paper Abstract

The solution of the forward equation that models the transport of light through a highly scattering tissue material in diffuse optical tomography (DOT) using the finite element method gives flux density (Φ ) at the nodal points of the mesh. The experimentally measured flux (U measured ) on the boundary over a finite surface area in a DOT system has to be corrected to account for the system transfer functions (R) of various building blocks of the measurement system. We present two methods to compensate for the perturbations caused by R and estimate true flux density (Φ ) from U cal measured . In the first approach, the measurement data with a homogeneous phantom (U homo measured ) is used to calibrate the measurement system. The second scheme estimates the homogeneous phantom measurement using only the measurement from a heterogeneous phantom, thereby eliminating the necessity of a homogeneous phantom. This is done by statistically averaging the data (U hetero measured ) and redistributing it to the corresponding detector positions. The experiments carried out on tissue mimicking phantom with single and multiple inhomogeneities, human hand, and a pork tissue phantom demonstrate the robustness of the approach.

Paper Details

Date Published: 19 February 2013
PDF: 10 pages
J. Biomed. Opt. 18(2) 026023 doi: 10.1117/1.JBO.18.2.026023
Published in: Journal of Biomedical Optics Volume 18, Issue 2
Show Author Affiliations
Samir Kumar Biswas, Indian Institute of Science (India)
Kanhirodan Rajan, Indian Institute of Science (India)
Ram Vasu, Indian Institute of Science (India)

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