Browsing by Author/Contributor "Yao, Gang, Ph. D."
Now showing items 1-17 of 17
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Angular Distribution of Diffuse Reflectance in Biological Tissue
Xia, Jinjun, 1971-; Yao, Gang, Ph. D. (The Optical Society of America, 2007-09)We measured angular-resolved diffuse reflectance in tissue samples of different anisotropic characteristics. Experimental measurements were compared with theoretical results based on the diffusion approximation. The results ... -
Applying the Polarization Memory Effect in Polarization-gated Subsurface Imaging
Nothdurft, Ralph; Yao, Gang, Ph. D. (The Optical Society of America, 2006-05)Polarization memory is a well established phenomenon occurring when circularly polarized light propagates in turbid media of larger particles. Recent studies have demonstrated that the circularly crosspolarized imaging can ... -
Correcting Optical-Axis Calculation in Polarization-Sensitive Optical Coherence Tomography
Fan, Chuanmao; Yao, Gang, Ph. D. (IEEE Transactions on Biomedical Engineering, 2010-10)Polarization-sensitive optical coherence tomography (PSOCT) has found many applications in imaging birefringence tissue samples. Polarization-sensitive detection is often implemented by utilizing a circularly polarized ... -
Effects of Inhomogeneous Myofibril Morphology on Optical Diffraction in Single Muscle Fibers
Ranasinghesagara, Janaka C.; Yao, Gang, Ph. D. (The Optical Society of America, 2008-12)Laser diffraction is commonly used in physiological research that explores single muscle fibers. Although variations in sarcomere morphological properties have often been observed, their effects on laser diffraction have ... -
Effects of Turbid Media Optical Properties on Object Visibility in Subsurface Polarization Imaging
Nothdurft, Ralph; Yao, Gang, Ph. D. (The Optical Society of America, 2006-08)We studied the effectiveness of using polarized illumination and detection to enhance the visibility of targets buried in highly scattering media. The effects of background optical properties including scattering coefficient, ... -
Equi-intensity Distribution of Optical Reflectance in a Fibrous Turbid Medium
Shuaib, Ali; Yao, Gang, Ph. D. (The Optical Society of America, 2010-02)Light propagation in a fibrous anisotropic scattering medium is quite different from that in an isotropic medium. Both the anisotropic diffuse equation (ADE) and the continuous time random walk (CTRW) theory predict that ... -
Expression of Target Optical Properties in Subsurface Polarization-gated Imaging
Nothdurft, Ralph; Yao, Gang, Ph. D. (The Optical Society of America, 2005-05)We examined the expression of target optical properties in subsurface polarization imaging under linearly and circularly polarized illumination. Reflecting, scattering, and absorption targets were imaged in tissue mimic ... -
Imaging 2D Optical Diffuse Reflectance in Skeletal Muscle
Ranasinghesagara, Janaka C.; Yao, Gang, Ph. D. (The Optical Society of America, 2007-04)We discovered a unique pattern of optical reflectance from fresh prerigor skeletal muscles, which can not be described using existing theories. A numerical fitting function was developed to quantify the equiintensity ... -
Imaging fiber orientation in articular cartilage using optical polarization tractography
Yao, Xuan (University of Missouri--Columbia, 2016)Articular cartilage plays a vital role in providing a low-friction surface between the bones of joints. This mechanical function is highly related to the special collagen organization in cartilage, especially in the ... -
Imaging Obscured Subsurface Inhomogeneity Using Laser Speckle
Nothdurft, Ralph; Yao, Gang, Ph. D. (The Optical Society of America, 2005-12)We have developed a laser speckle imaging method to reveal obscured subsurface inhomogeneities that cannot be seen under incoherent illumination. Speckle images of a scattering object were generated under coherent ... -
Monitoring Sarcomere Structure Changes in Whole Muscle Using Diffuse Light Reflectance
Xia, Jinjun, 1971-; Weaver, Amanda; Gerrard, David E.; Yao, Gang, Ph. D. (Society of Photo-Optical Instrumentation Engineers, 2006-07)Normal biomechanical and physiological functions of striated muscles are facilitated by the repeating sarcomere units. Light scattering technique has been used in studying single extracted muscle fibers. However, few ... -
Monte Carlo Model for Studying the Effects of Melanin Concentrations on Retina Light Absorption
Guo, Ya, 1977-; Yao, Gang, Ph. D.; Lei, Bo; Tan, Jinglu, 1958- (The Optical Society of America, 2008-02)We developed a Monte Carlo model to calculate light absorption in human and mouse retinas. The retina was modeled as a five-layer spherical structure. The effects of melanin concentrations in the retinal pigment epithelium ... -
Mueller Matrix Decomposition of Diffuse Reflectance Imaging in Skeletal Muscle
Li, Xin; Yao, Gang, Ph. D. (The Optical Society of America, 2009-05)Propagation of polarized light in skeletal muscle is significantly affected by anisotropic muscle structures. To completely characterize muscle polarization properties, we acquired the whole Mueller matrix images of the ... -
Polarization-sensitive Reflectance Imaging in Skeletal Muscle
Li, Xin; Ranasinghesagara, Janaka C.; Yao, Gang, Ph. D. (The Optical Society of America, 2008-06)We acquired polarization-sensitive reflectance images in freshly excised skeletal muscle samples. The obtained raw images varied depending on the incident and detection polarization states. The Stokes vectors were measured ... -
Propagation of polarized light in skeletal muscle
Li, Xin (University of Missouri--Columbia, 2009)Skeletal muscle is a very important tissue in animals and humans. Optical polarization imaging is a non-invasive method to study biological tissues and provides unique polarization contrast. An imaging system was developed ... -
Single Camera Spectral Domain Polarization-sensitive Optical Coherence Tomography Using Offset B-scan Modulation
Fan, Chuanmao; Yao, Gang, Ph. D. (The Optical Society of America, 2010-03)We report a simple implementation to acquire spectral domain polarization-sensitive optical coherence tomography (PSOCT) using a single camera. By combining a dual-delay assembly in the reference arm and offset B-scan in ... -
Transillumination Optical Tomography of Tissue-Engineered Blood Vessels: A Monte Carlo Simulation
Yao, Gang, Ph. D.; Haidekker, Mark A., 1963- (The Optical Society of America, 2005-07)A Monte Carlo technique has been developed to simulate the transillumination laser computed tomography of tissue-engineered blood vessels. The blood vessel was modeled as a single cylinder layer mounted on a tubular mandrel. ...