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Frontiers of Optoelectronics

Front. Optoelectron.    2017, Vol. 10 Issue (3) : 287-291     DOI: 10.1007/s12200-017-0723-7
RESEARCH ARTICLE |
Influence of pulse waves on the transmission of near-infrared radiation in outer-head tissue layers
Jerzy PLUCIŃSKI1(), Andrzej FRYDRYCHOWSKI2
1. Department of Metrology and Optoelectronics, Faculty of Electronics, Telecommunication and Informatics, Gdańsk University of Technology, ul. G. Narutowcza 11/12, 80-233 Gdańsk, Poland
2. Department of Human Physiology, Faculty of Health Sciences with Subfaculty of Nursing and Institute of Maritime and Tropical Medicine, Medical University of Gdańsk, ul. Tuwima 15, 80-210 Gdańsk, Poland
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Abstract

In this study, we investigate the effect of pulse waves on the transmission of near-infrared radiation in the outer tissue layers of the human head. This effect is important in using optical radiation to monitor brain conditions based on measuring the transmission changes in the near-infrared radiation between the source and the detector, placed on the surface of the scalp. This is because the signal related to the changes in the width of the subarachnoid space (SAS) due to the pulse wave is modified. These latter changes can be used, for instance, in detecting cerebral edema and in evaluating cerebral oxygenation. The research was performed by modeling the propagation of near-infrared radiation in the tissue layers using a Monte-Carlo method. The main objective of this study was to assess the extent to which the changes in the transmission of near-infrared radiation correspond to the changes in the optical parameters of the tissues of the head and in the width of the subarachnoid layer.

Keywords infrared radiation      transmission      human head      tissue      Monte-Carlo method     
Corresponding Authors: Jerzy PLUCIŃSKI   
Just Accepted Date: 18 July 2017   Online First Date: 23 August 2017    Issue Date: 26 September 2017
 Cite this article:   
Jerzy PLUCIŃSKI,Andrzej FRYDRYCHOWSKI. Influence of pulse waves on the transmission of near-infrared radiation in outer-head tissue layers[J]. Front. Optoelectron., 2017, 10(3): 287-291.
 URL:  
http://journal.hep.com.cn/foe/EN/10.1007/s12200-017-0723-7
http://journal.hep.com.cn/foe/EN/Y2017/V10/I3/287
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Jerzy PLUCIŃSKI
Andrzej FRYDRYCHOWSKI
Fig.1  Simplified diagram illustrating the effects of the pulse wave during particular phases of cardiac cycle on the width of the SAS, cerebral arteries and arterioles (indicated by different radii of the wheels), amount of blood in the skin (indicated by dot density), and the transmission of near-infrared radiation in the outer-head tissue layers, where 1, 2, 3, and 4 represent the skin, skull bone, SAS, and surface of the brain covered with cerebral arteries and arterioles (indicated by circles), respectively. S denotes the near-infrared source, PD denotes the proximal detector (used to compensate for a changes of skin absorption), and DD denotes the distal detector (used to detect near-infrared radiation propagating in the SAS or in the brain) [1]
Fig.2  Model of the outer-head tissue layers used in calculating the near-infrared transmission between the near-infrared radiation source and the detectors placed on the head surface
tissuethickness
/mm
absorption coefficient
/mm−1
reduced scattering coefficient
/mm−1
skin30.0131.7
bone – external compact lamina10.02420.88
bone – spongious layer2.50.016270.59268
bone – internal compact lamina1.50.02420.88
SAS0–3.50.0010.001
brain100.0372.0
Tab.1  Optical parameters of tissues of the head used for numerical modeling [14]
Fig.3  Changes in relative power due to the pulse wave received by the detector as a function of its distance from the near-infrared radiation source for different widths of the SAS (i.e., for (a) 0, (b) 0.3, (c) 1, and (d) 3.5 mm)
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