Validation of practical diffusion approximation for virtual near infrared spectroscopy using a digital head phantom

Yosuke Oki, Hiroshi Kawaguchi, Eiji Okada

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Light propagation in the digital head phantom for virtual near infrared spectroscopy and imaging is calculated by diffusion theory. In theory, diffusion approximation is not valid in a low-scattering cerebrospinal fluid (CSF) layer around the brain. The optical path length and spatial sensitivity profile predicted by the finite element method based upon the diffusion theory are compared with those predicted by the Monte Carlo method to validate a practical implementation of diffusion approximation to light propagation in an adult head. The transport scattering coefficient of the CSF layer is varied from 0.01 to 1.0 mm-1 to evaluate the influence of that layer on the error caused by diffusion approximation. The error is practically ignored and the geometry of the brain surface such as the sulcus structure in the digital head phantom scarcely affects the error when the transport scattering coefficient of the CSF layer is greater than 0.3 mm-1.

Original languageEnglish
Pages (from-to)153-159
Number of pages7
JournalOptical Review
Volume16
Issue number2
DOIs
Publication statusPublished - 2009 Mar

Fingerprint

cerebrospinal fluid
diffusion theory
infrared spectroscopy
scattering coefficients
approximation
brain
propagation
optical paths
Monte Carlo method
finite element method
sensitivity
profiles
geometry
scattering

Keywords

  • Diffusion approximation
  • Digital head phantom
  • Finite element method
  • Monte Carlo method
  • Near infrared spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Validation of practical diffusion approximation for virtual near infrared spectroscopy using a digital head phantom. / Oki, Yosuke; Kawaguchi, Hiroshi; Okada, Eiji.

In: Optical Review, Vol. 16, No. 2, 03.2009, p. 153-159.

Research output: Contribution to journalArticle

@article{7b85c5b6ca3c48939508f7b828d8e749,
title = "Validation of practical diffusion approximation for virtual near infrared spectroscopy using a digital head phantom",
abstract = "Light propagation in the digital head phantom for virtual near infrared spectroscopy and imaging is calculated by diffusion theory. In theory, diffusion approximation is not valid in a low-scattering cerebrospinal fluid (CSF) layer around the brain. The optical path length and spatial sensitivity profile predicted by the finite element method based upon the diffusion theory are compared with those predicted by the Monte Carlo method to validate a practical implementation of diffusion approximation to light propagation in an adult head. The transport scattering coefficient of the CSF layer is varied from 0.01 to 1.0 mm-1 to evaluate the influence of that layer on the error caused by diffusion approximation. The error is practically ignored and the geometry of the brain surface such as the sulcus structure in the digital head phantom scarcely affects the error when the transport scattering coefficient of the CSF layer is greater than 0.3 mm-1.",
keywords = "Diffusion approximation, Digital head phantom, Finite element method, Monte Carlo method, Near infrared spectroscopy",
author = "Yosuke Oki and Hiroshi Kawaguchi and Eiji Okada",
year = "2009",
month = "3",
doi = "10.1007/s10043-009-0026-3",
language = "English",
volume = "16",
pages = "153--159",
journal = "Optical Review",
issn = "1340-6000",
publisher = "Springer-Verlag GmbH and Co. KG",
number = "2",

}

TY - JOUR

T1 - Validation of practical diffusion approximation for virtual near infrared spectroscopy using a digital head phantom

AU - Oki, Yosuke

AU - Kawaguchi, Hiroshi

AU - Okada, Eiji

PY - 2009/3

Y1 - 2009/3

N2 - Light propagation in the digital head phantom for virtual near infrared spectroscopy and imaging is calculated by diffusion theory. In theory, diffusion approximation is not valid in a low-scattering cerebrospinal fluid (CSF) layer around the brain. The optical path length and spatial sensitivity profile predicted by the finite element method based upon the diffusion theory are compared with those predicted by the Monte Carlo method to validate a practical implementation of diffusion approximation to light propagation in an adult head. The transport scattering coefficient of the CSF layer is varied from 0.01 to 1.0 mm-1 to evaluate the influence of that layer on the error caused by diffusion approximation. The error is practically ignored and the geometry of the brain surface such as the sulcus structure in the digital head phantom scarcely affects the error when the transport scattering coefficient of the CSF layer is greater than 0.3 mm-1.

AB - Light propagation in the digital head phantom for virtual near infrared spectroscopy and imaging is calculated by diffusion theory. In theory, diffusion approximation is not valid in a low-scattering cerebrospinal fluid (CSF) layer around the brain. The optical path length and spatial sensitivity profile predicted by the finite element method based upon the diffusion theory are compared with those predicted by the Monte Carlo method to validate a practical implementation of diffusion approximation to light propagation in an adult head. The transport scattering coefficient of the CSF layer is varied from 0.01 to 1.0 mm-1 to evaluate the influence of that layer on the error caused by diffusion approximation. The error is practically ignored and the geometry of the brain surface such as the sulcus structure in the digital head phantom scarcely affects the error when the transport scattering coefficient of the CSF layer is greater than 0.3 mm-1.

KW - Diffusion approximation

KW - Digital head phantom

KW - Finite element method

KW - Monte Carlo method

KW - Near infrared spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=64749092462&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=64749092462&partnerID=8YFLogxK

U2 - 10.1007/s10043-009-0026-3

DO - 10.1007/s10043-009-0026-3

M3 - Article

VL - 16

SP - 153

EP - 159

JO - Optical Review

JF - Optical Review

SN - 1340-6000

IS - 2

ER -