2,016 research outputs found
Superresolution and Corrections to the Diffusion Approximation in Optical Tomography
We demonstrate that the spatial resolution of images in optical tomography is
not limited to the fundamental length scale of one transport mean free path.
This result is facilitated by the introduction of novel corrections to the
standard integral equations of scattering theory within the diffusion
approximation to the radiative transport equation.Comment: 8 pages 1 figur
Quantitative photoacoustic imaging in radiative transport regime
The objective of quantitative photoacoustic tomography (QPAT) is to
reconstruct optical and thermodynamic properties of heterogeneous media from
data of absorbed energy distribution inside the media. There have been
extensive theoretical and computational studies on the inverse problem in QPAT,
however, mostly in the diffusive regime. We present in this work some numerical
reconstruction algorithms for multi-source QPAT in the radiative transport
regime with energy data collected at either single or multiple wavelengths. We
show that when the medium to be probed is non-scattering, explicit
reconstruction schemes can be derived to reconstruct the absorption and the
Gruneisen coefficients. When data at multiple wavelengths are utilized, we can
reconstruct simultaneously the absorption, scattering and Gruneisen
coefficients. We show by numerical simulations that the reconstructions are
stable.Comment: 40 pages, 13 figure
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