Space-varying restoration of diffuse optical tomograms reconstructed by the filtered back projection algorithm
Автор: Konovalov А.в, Mogilenskikh D.v, Lyubimov V.V.
Журнал: Человек. Спорт. Медицина @hsm-susu
Рубрика: Инженерия в медико-биологической, образовательной и спортивной практике
Статья в выпуске: 3 (58) т.1, 2006 года.
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Possibility is investigated to enhance spatial resolution of diffuse optical tomograms reconstructed by the photon average trajectories (PAT) method. The PAT method is based on a concept of average statistical trajectory of light energy transfer from point source to point detector. The inverse problem of diffuse optical tomography reduces to solution of an integral equation with integration by conventional PAT. In the result for reconstruction of diffuse optical images the conventional algorithms of projection tomography can be applied, including filtered backprojection algorithm. The shortcoming of the PAT method is that it reconstructs I mages blurred in the result of averaging by photons spatial distribution contributing into the signal measured by a detector. To enhance resolution we apply a spatially variant blur model based on interpolation of spatially invariant point spread functions simulated for different image regions. To restore tomograms two iterative algorithms for solution of system of linear algebraic equations are used: conjugate gradient algorithm for least squares problems and modified residual norm steepest descent algorithm. It is shown that one can achieve 30% enhancement of spatial resolution.
Короткий адрес: https://sciup.org/147152124
IDR: 147152124
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