title: Modeling of diffuse reflectance of light in heterogeneous biological tissue to analysis of the effects of multiple scattering on reflectance pulse oximetry.
abstract: Fingertip-type pulse oximeters are popular, but their inconvenience for long-term monitoring in daily life means that other types of wearable pulse oximeters, such as reflectance pulse oximeters, need to be developed. For the purpose of developing reflection pulse oximetry, we have analyzed the light propagation in tissue to calculate and estimate the measured intensities of reflected light using the analytical and numerical solutions of the diffusion approximation equation. The reflectance of light from the biological tissue is investigated from theoretical and experimental perspectives, for light in the visible and near-infrared wavelengths. To establish the model, the calculated curves were compared with the analytical solution (AS) of the diffusion approximation equation in biological tissue. The results validated that the diffusion approximation equation could resolve the heterogeneous advanced tissue and the finite element method (FEM) could offer the simulation with higher efficiency and accuracy. Our aim has been to demonstrate the power of the FEM and AS in modeling of the steady-state diffusion approximation in a heterogeneous medium. Also, experimental data and the Monte Carlo model as a gold standard were used to verify the effectiveness of these methods.
authors.affiliation: Amirkabir University of Technology, Department of Medical Radiation Engineering, 424 Hafez Avenue, Tehran 15875-4413, Iran.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Mehrabi
authors.affiliation: Amirkabir University of Technology, Department of Medical Radiation Engineering, 424 Hafez Avenue, Tehran 15875-4413, Iran.
authors.forename: Saeed
authors.initials: S
authors.lastname: Setayeshi
authors.affiliation: Shahid Beheshti University of Medical Sciences, Department of Anesthesiology and Critical Care, Shohadaye Tajrish Hospital, Tajrish Square, Tehran 19899-34148, Iran.
authors.forename: Seyed Hossein
authors.initials: SH
authors.lastname: Ardehali
authors.affiliation: Tehran University of Medical Sciences, Research Center for Biomedical Technology and Robotics, Imam Khomeini Hospital complex, Keshavarz Boulevard, Tehran 14197-33141, Iran.
authors.forename: Hossein
authors.initials: H
authors.lastname: Arabalibeik
mesh_terms: D004058:Diffusion; D020342:Finite Element Analysis; D008027:Light; D008954:Models, Biological; D009010:Monte Carlo Method; D010092:Oximetry / Q000379:methods*; D012542:Scattering, Radiation