Measurement of optical coefficients of tissue-like solutions using a combination method of infinite and semi-infinite geometries with continuous near infrared light

This paper proposes a, new continuous wave (CW) method to measure the optical coefficients of a tissue-like solution by using a combination of infinite and semi-infinite geometries. Previous CW methods have required a long source-detector separation distance to distinguish the effects of absorption from scattering. This long separation distance results in inaccurate optical coefficients due to a low signal-to-noise ratio (SNR). A combination method is suitable for measuring optical coefficients of tissue-like solutions while using a short source-detector distance to increase the accuracy of the CW method. The measurement geometries are switched by an optical system, and light is detected at an avalanche photo-detector (APD). The absorption and reduced scattering coefficients are calculated from the slope and intercept values of a straight line derived from the fluence rate at several source-detector distances. The combination method provides an excellent separation performance between scattering and absorption with continuous'near infrared (NIR) light.
Publisher
INST PURE APPLIED PHYSICS
Issue Date
2006-09
Language
ENG
Keywords

FREQUENCY-DOMAIN; DIFFUSION-THEORY; STEADY-STATE; SPECTROSCOPY; SCATTERING; REFLECTANCE; ABSORPTION; PHANTOM; NM

Citation

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, v.45, no.9A , pp.7158 - 7162

ISSN
0021-4922
DOI
10.1143/JJAP.45.7158
URI
http://hdl.handle.net/10203/5347
Appears in Collection
ME-Journal Papers(저널논문)
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