Elimination of cross-talk in diffuse optical tomographic reconstructions through a weighted update procedure: results of simulation study

B. Kanmani; R. M. Vasu

doi:10.1117/12.696398

7 July 2006 Elimination of cross-talk in diffuse optical tomographic reconstructions through a weighted update procedure: results of simulation study

B. Kanmani, R. M. Vasu

Author Affiliations +

Proceedings Volume 6164, Saratov Fall Meeting 2005: Coherent Optics of Ordered and Random Media VI; 61640S (2006) https://doi.org/10.1117/12.696398
Event: Saratov Fall Meeting 2005, 2005, Saratov, Russian Federation

Abstract

Reconstructions in optical tomography involve obtaining the images of absorption and reduced scattering coefficients. The integrated intensity data has greater sensitivity to absorption coefficient variations than scattering coefficient. However, the sensitivity of intensity data to scattering coefficient is not zero. We considered an object with two inhomogeneities (one in absorption and the other in scattering coefficient). The standard iterative reconstruction techniques produced results, which were plagued by cross talk, i.e., the absorption coefficient reconstruction has a false positive corresponding to the location of scattering inhomogeneity, and vice-versa. We present a method to remove cross talk in the reconstruction, by generating a weight matrix and weighting the update vector during the iteration. The weight matrix is created by the following method: we first perform a simple backprojection of the difference between the experimental and corresponding homogeneous intensity data. The built up image has greater weightage towards absorption inhomogeneity than the scattering inhomogeneity and its appropriate inverse is weighted towards the scattering inhomogeneity. These two weight matrices are used as multiplication factors in the update vectors, normalized backprojected image of difference intensity for absorption inhomogeneity and the inverse of the above for the scattering inhomogeneity, during the image reconstruction procedure. We demonstrate through numerical simulations, that cross-talk is fully eliminated through this modified reconstruction procedure.

Citation Download Citation

B. Kanmani and R. M. Vasu "Elimination of cross-talk in diffuse optical tomographic reconstructions through a weighted update procedure: results of simulation study", Proc. SPIE 6164, Saratov Fall Meeting 2005: Coherent Optics of Ordered and Random Media VI, 61640S (7 July 2006); https://doi.org/10.1117/12.696398

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