11 papers · ranked by Valyu relevance
Nan Wang, Daniel Abraham, Zachary Shah, Yimeng Lin + 15 more
To develop a Field-Correcting GRAPPA (FCG) technique to correct the spatiotemporal-varying phase errors in EPI caused by eddy currents. The fast-changing gradient in EPI causes strong eddy current effects and associated spatiotemporal-varying phase errors, producing significant image artifacts. The use of higher…
Huakun Li, Bingyao Tan, Vimal Prabhu Pandiyan, Veluchamy Amutha Barathi + 3 more
Phase-sensitive Fourier-domain optical coherence tomography (FD-OCT) enables in-vivo, label- free imaging of cellular movements with detection sensitivity down to the nanometer scale, and it is widely employed in emerging functional imaging modalities, such as optoretinography (ORG), Doppler OCT, and optical coherence…
Vasily Matkivsky, Alexander Moiseev, Pavel Shilyagin, Alexander Rodionov + 5 more
A method for numerical estimation and correction of aberrations of the eye in fundus imaging with optical coherence tomography (OCT) is presented. Aberrations are determined statistically by using the estimate based on likelihood function maximization. The method can be considered as an extension of the phase gradient…
David J. Ma, Hortense A-M. Le, Yuming Ye, Andrew F. Laine + 4 more
We introduce DeepSPEC, a novel convolutional neural network (CNN) -based approach for frequency-and-phase correction (FPC) of MRS spectra to achieve fast and accurate FPC of single-voxel PRESS MRS and MEGA-PRESS data. In DeepSPEC, two neural networks, including one for frequency correction and one for phase correction…
Jean P. Elbers, David Horner, Tamara Löwenstern, Franco Laccone
Methods for sequence error correction can improve sequence accuracy; however, there can be unintended errors added during error correction. One such example is phase switching, whereby sequences derived from genomes containing more than one parental copy have contributions from more than one parental haplotype. Such…
Yongyi Cai, Eryk Druszkiewicz, Sara S. Patterson, Keith Parkins + 4 more
The quality of retinal images is compromised by aberrations that remain uncorrected even in confocal adaptive optics imaging. This study demonstrates phase diversity (PD), a computational imaging technique, to address residual aberrations and enhance image quality in adaptive optics scanning laser ophthalmoscopy…
Courtney Johnson, Min Guo, Magdalena C. Schneider, Yijun Su + 5 more
Fluorescence microscopy is an invaluable tool in biology, yet its performance is compromised when the wavefront of light is distorted due to optical imperfections or the refractile nature of the sample. Such optical aberrations can dramatically lower the information content of images by degrading image contrast…
David J. Ma, Yanting Yang, Natalia Harguindeguy, Ye Tian + 1 more
A novel convolutional neural network based spectral registration (CNN-SR) approach is introduced to achieve efficient and accurate simultaneous frequency-and-phase correction (FPC) of single-voxel MEGA-PRESS magnetic resonance spectroscopy (MRS) data. For this approach, one neural network was trained and validated…
Tianyuan Li, Shouqing Li, Zhaoyi Yan, Yuan Shen + 1 more
Ptychographic single-particle analysis (SPA) is a promising technique for high-resolution biological imaging but is still limited by sub-nanometer resolution. In this study, we identified and investigated a critical issue termed sampling mismatch in ptychography that is caused by inaccuracies in the scanning step size…
Mark Strassberg, Yana Shevtsova, Domenick Kamel, Kai Wagoner-oshima + 2 more
We present quantitative phase imaging with polarization differential interference contrast (PDIC) realized on a slightly modified differential interference contrast (DIC) microscope. By recording the Stokes vector rather than the intensity of the differential interference pattern with a polarization camera, PDIC…
Camille Gontier, William Hockeimer, Nicolas G. Kunigk, Edgar Canario + 5 more
Intracortical brain-computer interfaces (BCIs) are used to decode motor intent from neural population activity; their main clinical application is to restore function for individuals with motor or communication deficits. However, when trying to reconstruct movement trajectories, such as in computer cursor control, even…