George Y. Panasyuk, Vadim A. Markel, John C. Schotland
We demonstrate that the spatial resolution of images in optical tomography is not limited to the fundamental length scale of one transport mean free path. This result is facilitated by the introduction of novel corrections to the standard integral equations of scattering theory within the diffusion approximation to the radiative transport equation.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
The Rayleigh limit has so far applied to all microscopy techniques that rely on linear optical interaction and detection in the far field. Here we demonstrate that detecting the light emitted by an object in higher-order transverse electromagnetic modes (TEMs) can help achieving sub-Rayleigh precision for a variety of microscopy-related tasks. Using optical heterodyne detection in TEM01, we measure the position of coherently and incoherently emitting objects to within 0.0015 and 0.012 of the Rayleigh limit, respectively, and determine the distance between two incoherently emitting slits positi…
Ring artifacts correction method in x-ray computed tomography based on stripe classification and removal in sinogram images
提出基于正弦图条纹分类与去除的CT环状伪影校正方法，结合中值滤波与多相分解，经模拟和实验数据验证，有效提升图像质量。
In vivo dynamic optical coherence tomography of human skin with hardware- and software-based motion correction
本研究通过硬件和软件结合的方法改进了人体皮肤在体动态光学相干断层扫描的成像质量，发现了基底层的高DOCT层。
Optical Projection Tomography (OPT) is a powerful tool for 3D imaging of mesoscopic samples, thus of great importance to image whole organs for the study of various disease models in life sciences. OPT is able to achieve resolution at a few tens of microns over a large sample volume of several cubic centimeters. However, the reconstructed OPT images often suffer from artifacts caused by different kinds of physical miscalibration. This work focuses on the refractive index (RI) mismatch between the rotating object and the surrounding medium. We derive a 3D cone beam forward model to approximate …
We report experimental evidence and correction of defocus in full-field OCT of biological samples due to mismatch of the refractive index of biological tissues and water. Via a metric based on the image quality, we demonstrate that we are able to compensate this index-induced defocus and to recover a sharp image in depth.
Large-volume optical coherence tomography (OCT)-setups employ scanning mirrors and suffer from non-linear geometric distortion artifacts in which the degree of distortion is determined by the maximum angles over which the mirrors rotate. In this chapter, we describe a straightforward approach to correct for these distortion artifacts, creating an alternative to previously reported ray-tracing schemes that are unable to apply these corrections in real-time. By implementing the proposed 3D recalibration algorithm on the graphics card of a standard computer, this feature can be applied in real-ti…
Image formation theory of optical coherence tomography with optical aberrations and its application for computational aberration correction
本文提出OCT在光学像差下的图像形成理论，据此设计计算像差校正方法，在模拟和活体视网膜成像中实现多深度像差校正，提升图像质量，优于传统方法。
A unified method for three-dimensional reconstruction of objects from transmission images collected at multiple illumination directions is described. The method may be applicable to experimental conditions relevant to absorption-based, phase-contrast or diffraction imaging using X-rays, electrons and other forms of penetrating radiation or matter waves. Both the phase retrieval (also known as contrast transfer function correction) and the effect of Ewald sphere curvature (in the cases with a shallow depth of field and significant in-object diffraction) are incorporated in the proposed algorith…
Suppression of noise in separation estimation of optical sources with spatial-mode demultiplexing
本文针对空间模式解复用估计光源分离时噪声导致的超分辨退化问题，提出基于重复解复用与旋转插入的纠错协议，实现噪声解耦并恢复超分辨能力。
Open-source segmentation and biometry dataset using spectrally-multiplexed whole-eye optical coherence tomography
本文提出了一种新颖的光谱复用全眼光学相干断层扫描系统，结合深度学习进行表面分割和3D畸变校正，实现了高精度的3D重建，同时开源了包含6621个处理后的体积的数据集，用于改善相关领域的数据获取瓶颈。
Mechanical Artifacts in Optical Projection Tomography: Classification and Automatic Calibration
本文系统分类了光学投影断层成像中的机械伪影，并提出一种自动校准算法，通过恢复未知系统参数实现无畸变三维重建，仿真与实验均验证其有效性。
Multi-contrast Jones-matrix optical coherence tomography -- the concept, principle, implementation, and applications
该综述系统介绍了作为OCT广义扩展的多对比度琼斯矩阵光学相干断层扫描（JM-OCT）的概念、原理、实现方式、信号图像处理方法及生物临床应用，还涵盖其噪声校正等前沿技术内容。
Ghostbuster: a phase retrieval diffraction tomography algorithm for cryo-EM
本文提出Ghostbuster算法，通过恢复电子出射波相位并考虑一阶Born近似散射，有效消除了cryo-EM中薄粒子重建产生的ghosts伪影，无需修改现有数据采集流程即可提升重建质量。
Subaperture-based Digital Aberration Correction for OCT: A Novel Mathematical Approach
本文提出一种基于子孔径的OCT数字像差校正新方法，通过建立数学框架改进子孔径相关方法，并仅需极少统计假设，经模拟与实验数据验证其有效性。
Spatiotemporal optical coherence (STOC) imaging is a new technique for suppressing coherent crosstalk noise in Fourier-domain full-field optical coherence tomography (FD-FF-OCT). In STOC imaging, the timevarying inhomogeneous phase masks modulate the incident light to alter the interferometric signal. Resulting interference images are then processed as in standard FD-FF-OCT and averaged incoherently or coherently to produce crosstalk-free volumetric OCT images of the sample. Here, we show that coherent averaging is suitable when phase modulation is performed for both interferometer arms simult…
Dispersion in nonlinear interferometry: implications for optical coherence tomography with undetected photons
本文提出了一种基于时域模态的新型数值补偿方法，用于改善非线性干涉仪中色散对光学相干层析成像的影响，提升了轴向分辨率和成像性能。
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。