We have developed a novel phase-resolved optical coherence tomography (OCT) and Doppler (ODT) system that uses phase information derived from Hilbert transformation to image blood flow in human skin with fast scanning speed high velocity sensitivity. Using the change between sequential scans construct flow-velocity imaging, this technique decouples spatial resolution sensitivity images increases imaging by more than 2 orders of magnitude without compromising or The minimum can be detected an...

In optical coherence tomography, axial and lateral resolutions are determined by the source length numerical aperture of sampling lens, respectively. Whereas resolution can be improved use a broadband light source, there is trade-off between focusing depth when conventional elements used. We report on incorporation an axicon lens into sample arm interferometer to overcome this limitation. Using with top angle 160°, we maintained 10‐µm or better over at least 6 mm. addition having high...

A high-speed single-mode fiber–based polarization-sensitive optical coherence tomography (PS OCT) system was developed. With a polarization modulator, Stokes parameters of reflected flight for four input states are measured as function depth. phase modulator in the reference arm Michelson interferometer permits independent control axial scan rate and carrier frequency. In vivo PS OCT images human skin presented, showing subsurface structures that not discernible conventional images....

We used a novel phase-resolved optical Doppler tomographic (ODT) technique with very high flow-velocity sensitivity 10 µm/s and spatial resolution µm to image blood flow in port-wine stain (PWS) birthmarks human skin. In addition the regular ODT velocity structural images, we use variance of map PWS vessels. Our device combines therapeutic systems such that can be monitored situ before after laser treatment. To authors’ knowledge this is first clinical application provide fast...

We have developed an ultrahigh-resolution optical coherence tomographic system in which broadband continuum generation from a photonic crystal fiber is used to produce high longitudinal resolution. Longitudinal resolution of 1.3‐µm has been achieved biological tissue by use light 800 1400 nm. The employed dynamic-focusing tracking method maintain lateral over large imaging depth. Subcellular demonstrated.

Optical Doppler tomography (ODT) is an imaging modality that takes advantage of the short coherence length a broad-band light sources to perform micrometer-scale, cross-sectional tissue structure and blood flow dynamics simultaneously. The authors review in this paper principal ODT its applications. Results from vitro vivo model studies demonstrated can map velocity profile with high spatial resolution scattering medium. detection mechanisms are illustrated using Monte Carlo simulations....

The Doppler bandwidth extracted from the standard deviation of frequency shift in phase-resolved functional optical coherence tomography (F-OCT) was used to image velocity component that is transverse probing beam. It found above a certain threshold level linear function flow and effective numerical aperture objective sample arm determines slope this dependence. permits accurate measurement without need for precise determination direction when angle within ±15° perpendicular Such an approach...

The functional relationship between soil permittivity and water content serves as the theoretical foundation for electromagnetic wave-based techniques used to determine moisture levels. However, response of changes in varies significantly across different types. Current models that utilize estimate are often based on empirical statistical relationships specific particular Moreover, existing physical hindered by an excessive number parameters, which can be difficult measure or calculate. This...

We have developed a novel real-time phase-resolved functional optical coherence tomography system that uses Hilbert transformation. When we use resonant scanner in the reference arm of interferometer, with an axial scanning speed 4 kHz, frame rate both structural and Doppler blood-flow imaging size 100 by pixels is 10 Hz. The has high sensitivity larger dynamic range for measuring frequency shift due to moving red blood cells. Real-time images vivo flow human skin obtained this...

We have developed a novel real-time phase-resolved optical coherence tomography (OCT) and Doppler (ODT) system using Hilbert transformation. By combining circularly polarized reference linearly sample signals, in-phase quadrature interference components are produced in separate channels treated as the real imaginary parts of complex signal to obtain phase information directly. Using resonant scanner at an axial scanning speed 4 kHz arm interferometer, both structure blood flow velocity...

We describe a phase-resolved functional optical coherence tomography system that can simultaneously yieldin situ images of tissue structure, blood flow velocity, standard deviation, birefringence, and the Stokes vectors in human skin. Multifunctional were obtained by processing analytical interference fringe signals derived from two perpendicular polarization-detection channels. The velocity deviation comparison phases pairs neighboring A-lines same polarization state. polarization-diversity...

OBJECTIVE The purpose of this study was to use high‐speed optical coherence tomography (OCT) obtain cross‐sectional images the rat cochlea. STUDY DESIGN AND METHODS cochleae Sprague‐ Dawley rats were imaged within 2 4 hours after death. Specimens prepared by removing bulla expose mesotympanum; some obtained in intact temporal bones removed from cranium. central element an OCT imaging device is a Michelson interferometer combined with low‐coherence light source. This used systems different...

We report on application of pulsed photothermal radiometry (PPTR) to determine the depth port wine stain (PWS) blood vessels in human skin. When are deep PWS skin (>100 µm), conventional PPTR profiling can be used with sufficient accuracy. close or partially overlap epidermal melanin layer, a modified technique using two-wavelength (585 and 600 nm) excitation is superior method depth. A direct difference approach which determined from weighted temperature profiles reconstructed independently...

Tensor network states (TNS) methods combined with the Monte Carlo (MC) technique have been proven a powerful algorithm for simulating quantum many-body systems. However, because ground state energy is highly non-linear function of tensors, it easy to get stuck in local minima when optimizing TNS simulated physical To overcome this difficulty, we introduce replica-exchange molecular dynamics optimization obtain state, based on MC sampling technique, by mapping that classical mechanical...

To study the status quo of research on geological hazards in Central China Orogen and its distribution quantitatively, we used bibliometric methods deeply analysed numbers, authors institutions involved, changes contents papers published from 1962 to 2016. This review involved 26,677 documents, 26,339 authors, 11,095 institutions. The results showed that has significant time‐domain characteristics. In this field, greatest number was Recent Developments World Seismology Chinese Journal...

In this paper, we report an application of the Hylleraas-$B$-spline basis to calculation nonrelativistic Bethe logarithm helium. The logarithms for $n{\phantom{\rule{0.16em}{0ex}}}^{1}S$ states helium, where $n$ is up 10, are calculated precisely in acceleration and velocity-acceleration gauges, which greatly improves accuracy traditional B-spline basis. addition, overcome numerical instability problem emerging from use basis, a multiple-precision generalized symmetric eigenvalue solver developed.

Finite difference time domain (FDTD) method is a robust and accurate algorithm which widely used in computational electromagnetic field the simulation of optical phenomenon. In this paper, parallel FDTD based on overlapped decomposition to simulate band gap photonic crystals quantum efficiency thin film solar cells. The light-trapping effect also analyzed by FDTD, it's very important improve light absorption. Numerical result demonstrates that accuracy speedup are high for large scale problem.

Permafrost distribution is of great significance for the study climate, ecology, hydrology, and infrastructure construction in high-cold mountain regions with complex topography. Therefore, updated high-resolution permafrost mapping necessary highly demanded related fields. This case conducted a small catchment northeast Qinghai Tibet Plateau proposes new method using ground-penetrating radar (GPR) to detect stratigraphic structure, interpret characteristics frozen ground, extract boundaries...

The differentiation transforming (DFT) system is developed to produce the tangent linear codes, which used calculate Jacobian- and Hessian-vector products with no truncation errors. This paper first gives introduction of functionality features DFT system, then discusses several techniques for implementation automatic tools, including data dependence analysis, singular code optimization. Finally, codes generated in applications have been demonstrated.