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Somatosensory-Evoked Potentials and Clinical Assessments of Sensory Function Over Time in Patients With Subacute Stroke.
Neural Plast
January 2025
Department of Rehabilitation Medicine, School of Medicine, Tokai University, Kanagawa, Japan.
To demonstrate the utility of somatosensory evoked potentials (SEPs) following median nerve stimulation for chronological assessment of sensory function in patients with subacute stroke during rehabilitation. Retrospective study. Forty-seven patients with hemiparesis due to stroke during the subacute phase.
View Article and Find Full Text PDFOff-axis electron holography of unstained bacteriophages: Toward electrostatic potential measurement of biological samples.
J Struct Biol
January 2025
CEMES-CNRS, Université de Toulouse, I3EM Team, 29 rue JeanneMarvig B.P, 94347 31055 Toulouse, France. Electronic address:
Transmission electron microscopy, especially at cryogenic temperature, is largely used for studying biological macromolecular complexes. A main difficulty of TEM imaging of biological samples is the weak amplitude contrasts due to electron diffusion on light elements that compose biological organisms. Achieving high-resolution reconstructions implies therefore the acquisition of a huge number of TEM micrographs followed by a time-consuming image analysis.
View Article and Find Full Text PDFIn this Letter, we propose and experimentally validate a high-fidelity and adaptive forward-phase-based vibration sensing using a Wiener filter (WF). In commercial coherent digital subcarrier multiplexing (DSCM) systems under external cavity lasers (ECLs), frequency-domain pilot tones (FPTs) in subcarrier intervals are employed for dynamic frequency offset estimation (FOE), carrier phase estimation (CPE), and polarization demultiplexing. The phase estimated by the CPE module is processed with the WF to achieve high-fidelity extraction of the vibration-induced phase.
View Article and Find Full Text PDFFourier ptychographic microscopy (FPM) can provide high-throughput imaging by computationally combining low-resolution images at different spatial frequencies within the Fourier domain. The core algorithm for FPM reconstruction draws upon phase retrieval techniques, including methods such as the ptychographic iterative engine (PIE), regularized PIE (rPIE), and embedded pupil function FPM (EPRY-FPM). The calibration of the physical setup plays a crucial role in the quality of the reconstructed high space-bandwidth product (SPB) image.
View Article and Find Full Text PDFWe present a non-interferometric technique for quantitative phase imaging (QPI) that is cost-effective, easily integrated into standard microscopes, and capable of wide-field imaging with noncoherent light. Our method measures the phase gradient through optical differentiation using spatially variable amplitude filters, accommodating a range of transmission functions, including commercially available variable neutral-density filters. This flexibility is made possible by a general relationship we derive.
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