Abstract
The anisotropy complex refractive index of tissue is an important parameter in understanding the behavior of light, including its transportation in and interaction with tissues. We used the specular reflection method to investigate the anisotropy complex refractive index of chicken tissue with fibrous structures in vitro at a wavelength of 650 nm. The measurement data were highly consistent with the Fresnel equations. The results showed that the real refractive index was higher along the orientation of the fibers than along the cross section, but the imaginary refractive index was nearly identical. Furthermore, the fiber orientation was in the direction of the optic axis of the chicken tissue and the chicken tissue section was similar to a negative uniaxial crystal wafer.
Highlights
Tissue characteristics play an important role in all kinds of medical laser treatments and biomedical imaging [1, 2]
The obvious fibrous structure of the tissue was suitable for this study of optical anisotropy
Analysis of the data indicates that the chicken tissue with fibrous structures showed optical anisotropy
Summary
Tissue characteristics play an important role in all kinds of medical laser treatments and biomedical imaging [1, 2]. Investigations on the optical anisotropy of fibrous tissues using OCT, especially polarization-sensitive optical coherence tomography (PS-OCT), were reported by several research groups [16]– [19] Many tissues such as tendon, muscle, nerve, and cartilage influence the polarization state of light backscattered due to their linear or fibrous structures, and PS-OCT can potentially be a very useful technique in the investigation of the structural properties and biochemical composition of these tissues. To understand light behavior, including its transportation in tissues and interaction with biological objects, it is necessary to acquire accurate data regarding the refractive indices of tissues It is still an open question and an important task to obtain anisotropy refractive index of tissue accurately
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