Volume 11, Issue 12 e201800141
FULL ARTICLE

Optical windows for head tissues in near-infrared and short-wave infrared regions: Approaching transcranial light applications

Sergii Golovynskyi

Sergii Golovynskyi

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China

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Iuliia Golovynska

Iuliia Golovynska

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China

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Ludmila I. Stepanova

Ludmila I. Stepanova

Institute of Biology and Medicine, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine

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Oleksandr I. Datsenko

Oleksandr I. Datsenko

Physics Faculty, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine

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Liwei Liu

Liwei Liu

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China

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Junle Qu

Corresponding Author

Junle Qu

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China

Correspondence

Junle Qu, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.

Email: [email protected]

Tymish Y. Ohulchanskyy, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.

Email: [email protected]

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Tymish Y. Ohulchanskyy

Corresponding Author

Tymish Y. Ohulchanskyy

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China

Correspondence

Junle Qu, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.

Email: [email protected]

Tymish Y. Ohulchanskyy, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.

Email: [email protected]

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First published: 11 August 2018
Citations: 162
Sergii Golovynskyi and Iuliia Golovynska contributed equally to this study.

Abstract

Optical properties of the rat head tissues (brain cortex, cranial bone and scalp skin) are assessed, aiming at transcranial light applications such as optical imaging and phototherapy. The spectral measurements are carried out over the wide spectral range of 350 to 2800 nm, involving visible, near-infrared (NIR) and short-wave infrared (SWIR) regions. Four tissue transparency windows are considered: ~700 to 1000 nm (NIR-I), ~1000 to 1350 nm (NIR-II), ~1550 to 1870 nm (NIR-III or SWIR) and ~2100 to 2300 nm (SWIR-II). The values of attenuation coefficient and total attenuation length are determined for all windows and tissue types. The spectra indicate transmittance peaks in NIR, NIR-II and SWIR-II, with maximum tissue permeability for SWIR light. The use of SWIR-II window for the transcranial light applications is substantiated. Furthermore, absorbance of the head tissues is investigated in details, by defining and describing the characteristic absorption peaks in NIR-SWIR.

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