Basic and Clinical Neuroscience Journal
مجله علوم اعصاب پایه و بالینی
BCN
Medical Sciences
http://bcn.iums.ac.ir
137
journal137
2008-126X
2228-7442
10.32598/bcn
en
jalali
1401
12
1
gregorian
2023
3
1
14
2
online
1
fulltext
en
Quantitative Comparison of Analytical Solution and Finite Element Method for Investigation of Near-infrared Light Propagation in Brain Tissue Model
Computational Neuroscience
Computational Neuroscience
Original
Original
<div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Tahoma;"><span style="line-height:2;"><strong>Introduction</strong>: Functional near-infrared spectroscopy (fNIRS) is an imaging method in which a light source and detector are installed on the head; consequently, the re-emission of light from human skin contains information about cerebral hemodynamic alteration. The spatial probability distribution profile of photons penetrating tissue at a source spot, scattering into the tissue, and being released at an appropriate detector position, represents the spatial sensitivity. <br>
<strong>Methods</strong>: Modeling light propagation in a human head is essential for quantitative near-infrared spectroscopy and optical imaging. The specific form of the distribution of light is obtained using the theory of perturbation. An analytical solution of the perturbative diffusion equation (DE) and finite element method (FEM) in a Slab media (similar to the human head) makes it possible to study light propagation due to absorption and scattering of brain tissue. <br>
<strong>Results</strong>: The simulation result indicates that sensitivity is slowly decreasing in the deep area, and the sensitivity below the source and detector is the highest. The depth sensitivity and computation time of both analytical and FEM methods are compared. The simulation time of the analytical approach is four times larger than the FEM. <br>
<strong>Conclusion</strong>: In this paper, an analytical solution and the performance of FEM methods when applied to the diffusion equation for heterogeneous media with a single spherical defect are compared. The depth sensitivity along with the computation time of simulation has been investigated for both methods. For simple and Slab modes of the human brain, the analytical solution is the right candidate. Whenever the brain model is sophisticated, it is possible to use FEM methods, but it costs a higher computation time.</span></span></span><span style="font-size:11pt"><span style="line-height:150%"><span sans-serif="" style="font-family:Calibri,"><b><span style="font-family:"Cambria Math","serif""></span></b></span></span></span></div>
Functional near-infrared spectroscopy (fNIRS), Perturbation theory, Diffusion equation (DE), Depth sensitivity, Contrast, Finite element method (FEM)
193
202
http://bcn.iums.ac.ir/browse.php?a_code=A-10-1930-1&slc_lang=en&sid=1
Hadi
Borjkhani
h_borjkhani@ut.ac.ir
13700319475328460044854
13700319475328460044854
No
Control and Intelligent Processing Center of Excellence, School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran.
Seyed Kamaledin
Setarehdan
ksetareh@ut.ac.ir
13700319475328460044855
13700319475328460044855
Yes
Control and Intelligent Processing Center of Excellence, School of Electrical and Computer Engineering, University of Tehran, Tehran, Iran.