Results 91 to 100 of about 1,097,686 (233)

Generalized shift-rotation absolute measurement method for high-numerical-aperture spherical surfaces with global optimized wavefront reconstruction algorithm.

Optics Express, 2017
In this paper, a generalized shift-rotation absolute measurement method is proposed to measure the absolute surface shape of high-numerical-aperture spherical surfaces. Based on the wavefront difference method, the high order misalignment aberrations can
Zhongming Yang, Jinyu Du, Chao Tian, Jiantai Dou, Q. Yuan, Zhishan Gao   +5 more
semanticscholar   +1 more source

Demonstration of a family of X‐ray dark‐field retrieval approaches on a common set of samples

Journal of Synchrotron Radiation, EarlyView.
This study aims to guide users of dark‐field imaging in selecting the most suitable technique for their imaging goals. To this end, we provide a summary table and highlight opportunities for future research into the sources of dark‐field contrast across emerging methods.There are various imaging setups capable of capturing dark‐field images, each with ...
Samantha J. Alloo, Ying Ying How, Jannis N. Ahlers, David M. Paganin, Michelle K. Croughan, Kaye S. Morgan   +5 more
wiley   +1 more source

3D imaging of neuronal inclusions and protein aggregates in human neurodegeneration by multiscale x‐ray phase‐contrast tomography

Brain Pathology, EarlyView.
x‐ray phase‐contrast tomography enabled three‐dimensional, label‐free visualization and quantification of protein aggregates in neurodegenerative diseases with isotropic submicrometer resolution. The study revealed distinct electron density patterns in Lewy bodies, Hirano bodies, granulovacuolar degeneration, and amyloid plaques, highlighting their ...
Jonas Franz, Jakob Reichmann, Marina Eckermann, Thea Würfel, Artur Groh, Syed Fatima Qadri, Katja Schulz, Brit Mollenhauer, Christine Stadelmann, Tim Salditt   +9 more
wiley   +1 more source

Understanding Atrial Fibrillation Complexity Through the Lens of Turbulence Dynamics: Implications for Treatment Strategies

Journal of Cardiovascular Electrophysiology, EarlyView.
ABSTRACT Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia encountered in clinical practice. Its incidence increases significantly with age and has become a major global public health issue. Although research into the mechanisms of AF has spanned over a century‐ranging from the reentry theory to the rotor hypothesis‐none of these
Xin Chu, Xiaohan Jiang, Qing Qiao, Xiaojun Wang, Hong Ye   +4 more
wiley   +1 more source

Three-Dimensional Microwave Imaging for Concealed Weapon Detection Using Range Stacking Technique

International Journal of Antennas and Propagation, 2017
Three-dimensional (3D) microwave imaging has been proven to be well suited for concealed weapon detection application. For the 3D image reconstruction under two-dimensional (2D) planar aperture condition, most of current imaging algorithms focus on ...
Weixian Tan, Pingping Huang, Zengshu Huang, Yaolong Qi, Wenqin Wang   +4 more
doaj   +1 more source

Adaptive blind image deblurring and denoising

Scandinavian Journal of Statistics, EarlyView.
Abstract Blind image deblurring aims to reconstruct the original image from its blurred version without knowing the blurring mechanism. This is a challenging ill‐posed problem because there are infinitely many possible solutions. The ill‐posedness is further exacerbated if the blurring mechanism depends on the pixel location.
Yicheng Kang, Anik Roy, Partha Sarathi Mukherjee   +2 more
wiley   +1 more source

An Improved Method of Measuring Wavefront Aberration Based on Image with Machine Learning in Free Space Optical Communication

Sensors, 2019
In this paper, an improved method of measuring wavefront aberration based on image with machine learning is proposed. This method had better real-time performance and higher estimation accuracy in free space optical communication in cases of strong ...
Yangjie Xu, Dong He, Qiang Wang, Hongyang Guo, Qing Li, Zongliang Xie, Yongmei Huang   +6 more
doaj   +1 more source

Computational study of the excitation of human induced pluripotent stem cell‐derived cardiomyocytes

Experimental Physiology, EarlyView.
Abstract Human induced pluripotent stem cell‐derived cardiomyocytes (hiPSC‐CMs) have proven to be a revolutionary advance for tissue engineering, disease modelling, and drug testing and discovery. Computational modelling enables detailed electrophysiological analysis that is otherwise difficult or impossible to achieve under strictly experimental ...
Roshni Shetty, Raffi Samurkashian, Leslie Tung   +2 more
wiley   +1 more source

An integrated platform for 2‐D and 3‐D optical and electrical mapping of arrhythmias in Langendorff‐perfused rabbit hearts

The Journal of Physiology, EarlyView.
Abstract figure legend Integrated multimodal platform for panoramic cardiac mapping in isolated heart experiments. On the left, an image of the experimental setup during data acquisition showing a Langendorff‐perfused rabbit heart surrounded by three optical cameras (CAM A, B and C) positioned 120° apart, each coupled with high‐power LEDs for panoramic
Jimena Siles, Vinícius Silva, Tainan Neves, Italo Sandoval, Angélica Quadros, Giovanni Weber, Óscar Barquero, Ilija Uzelac, João Salinet   +8 more
wiley   +1 more source

Structural determinants of re‐entrant drivers in atrial fibrillation: insights from digital twins derived from 3D micrometre‐resolution imaging of human heart

The Journal of Physiology, EarlyView.
Abstract figure legend Digital heart models of human donor atria with cardiac co‐morbidities revealed that regions with AWT variation, aligned myofibres adjacent to disorganised zones and fibrotic borders promoted the localisation and stability of RDs. AWT had a global influence, whereas fibre orientation and fibrosis exerted chamber‐specific regional ...
Anuradha Kulathilaka, Roshan Sharma, James Kennelly, Ning Li, Jieyun Bai, Bruce H. Smaill, Mark L. Trew, Vadim V. Fedorov, Jichao Zhao   +8 more
wiley   +1 more source