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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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X-ray Imaging

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Deconvolution01:20

Deconvolution

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Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
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Aliasing01:18

Aliasing

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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
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Updated: Apr 30, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Imágenes en tiempo real multi-cuadro de disparo único utilizando supercontinuum discreto.

Chong Zhang, Baoshan Guo, Manlou Ye

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    La imagen instantánea dinámica extrema codificada por fotones supercontinuos (SPEED-SI) logra imágenes de alta velocidad y alta resolución. Esta técnica de imagen ultrarrápida permite la captura continua a escala de femtosegundos sin reconstrucción compleja.

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    Área de la Ciencia:

    • Imágenes ópticas de imágenes ópticas.
    • La espectroscopia es una técnica de espectroscopia.
    • Fenómenos ultrarrápidos son fenómenos ultrarrápidos.

    Sus antecedentes:

    • Los métodos de imagen continua ultrarrápida existentes presentan limitaciones en la profundidad de la secuencia, la resolución temporal y la complejidad del sistema.
    • Existe la necesidad de técnicas de imagen avanzadas capaces de capturar eventos extremadamente rápidos con alta fidelidad.

    Objetivo del estudio:

    • Desarrollar una nueva técnica de imagen ultrarrápida que supere las compensaciones inherentes a los métodos actuales.
    • Para lograr una alta profundidad de secuencia y resolución temporal en imágenes continuas de un solo disparo en la escala de tiempo de femtosegundos.

    Principales métodos:

    • Desarrollo de imágenes instantáneas dinámicas extremas codificadas por fotones supercontinuos (SPEED-SI).
    • Se utilizó una segmentación espectral precisa en el plano de Fourier para discretizar un pulso supercontinuo en canales espectrales independientes.
    • Empleó una rejilla de difracción de mayor densidad para mejorar la profundidad de secuencia y la velocidad de fotogramas.

    Principales resultados:

    • Logró imágenes ultrarrápidas de un solo disparo con 36 cuadros por adquisición y tiempo de exposición de femtosegundos.
    • Demostró una velocidad máxima de cuadro de 10,5 billones de cuadros por segundo (Tfps), expandible a 17,9 Tfps con 45 cuadros.
    • Generó imágenes de alta fidelidad en tiempo real sin reconstrucción computacional, mostrando la mayor profundidad de secuencia para imágenes continuas de femtosegundo.

    Conclusiones:

    • SPEED-SI ofrece una nueva y potente capacidad para investigar fenómenos ultrarrápidos con un detalle sin precedentes.
    • El potencial de la técnica para la amplitud de banda espectral y la expansión de la profundidad de secuencia se demostró utilizando la generación de continuo ultravioleta.
    • Estableció SPEED-SI como un avance significativo en la imagen ultrarrápida de alta resolución en tiempo real.