R L Barbour
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Explore the profile of R L Barbour including associated specialties, affiliations and a list of published articles.
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Articles
41
Citations
259
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Recent Articles
1.
Chang J, Graber H, Barbour R
J Biomed Opt
. 2012 Sep;
3(2):137-44.
PMID: 23015050
By applying linear perturbation theory to the radiation transport equation, the inverse problem of optical diffusion tomography can be reduced to a set of linear equations, Wμ=R, where W is...
2.
Chang J, Graber H, Barbour R, Aronson R
Appl Opt
. 2010 Nov;
35(20):3963-78.
PMID: 21102799
We present a useful strategy for imaging perturbations of the macroscopic absorption cross section of dense-scattering media using steady-state light sources. A perturbation model based on transport theory is derived,...
3.
Yao Y, Barbour R, Wang Y, Graber H, Chang J
Appl Opt
. 2010 Nov;
35(4):735-51.
PMID: 21069064
We present analytic expressions for the amplitude and phase of photon-density waves in strongly scattering, spherically symmetric, two-layer media containing a spherical object. This layered structure is a crude model...
4.
Pei Y, Graber H, Barbour R
Appl Opt
. 2008 Mar;
40(31):5755-69.
PMID: 18364867
Optical measurements of tissue can be performed in discrete, time-averaged, and time-varying data collection modes. This information can be evaluated to yield estimates of either absolute optical coefficient values or...
5.
Schmitz C, Graber H, Luo H, Arif I, Hira J, Pei Y, et al.
Appl Opt
. 2008 Mar;
39(34):6466-86.
PMID: 18354661
Instrumentation is described that is suitable for acquiring multisource, multidetector, time-series optical data at high sampling rates (up to 150 Hz) from tissues having arbitrary geometries. The design rationale, calibration...
6.
Chang J, Graber H, Barbour R
Appl Opt
. 2008 Feb;
37(16):3547-52.
PMID: 18273322
We examine the impact of background lumiphore on image quality in luminescence optical tomography. A modification of a previously described algorithm [J. Chang, H. L. Graber, and R. L. Barbour,...
7.
Barbour R, Graber H, Pei Y, Zhong S, Schmitz C
J Opt Soc Am A Opt Image Sci Vis
. 2002 Jan;
18(12):3018-36.
PMID: 11760200
Methods used in optical tomography have thus far proven to produce images of complex target media (e.g., tissue) having, at best, relatively modest spatial resolution. This presents a challenge in...
8.
Hielscher A, Alcouffe R, Barbour R
Phys Med Biol
. 1998 Jun;
43(5):1285-302.
PMID: 9623656
We analyse the limits of the diffusion approximation to the time-independent equation of radiative transfer for homogeneous and heterogeneous biological media. Analytical calculations and finite-difference simulations based on diffusion theory...
9.
Nonlinear effects of localized absorption perturbations on the light distribution in a turbid medium
Graber H, Aronson R, Barbour R
J Opt Soc Am A Opt Image Sci Vis
. 1998 Apr;
15(4):834-48.
PMID: 9536514
A theoretical model of photon propagation in a scattering medium is presented, from which algebraic formulas for the detector-reading perturbations (delta R) produced by one or two localized perturbations in...
10.
Chang J, Graber H, Barbour R
IEEE Trans Biomed Eng
. 1997 Sep;
44(9):810-22.
PMID: 9282473
Two one-speed radiation transport equations coupled by a dynamic equation for the distribution of fluorophore electronic states are used to model the migration of excitation photons and emitted fluorescence photons....