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  2. Optical transfer function - Wikipedia

    en.wikipedia.org/wiki/Optical_transfer_function

    The three-dimensional point spread functions (a,c) and corresponding modulation transfer functions (b,d) of a wide-field microscope (a,b) and confocal microscope (c,d). In both cases the numerical aperture of the objective is 1.49 and the refractive index of the medium 1.52.

  3. Confocal microscopy - Wikipedia

    en.wikipedia.org/wiki/Confocal_microscopy

    Fluorescence and confocal microscopes operating principle. Confocal microscopy, most frequently confocal laser scanning microscopy (CLSM) or laser scanning confocal microscopy (LSCM), is an optical imaging technique for increasing optical resolution and contrast of a micrograph by means of using a spatial pinhole to block out-of-focus light in image formation. [1]

  4. Calcium imaging - Wikipedia

    en.wikipedia.org/wiki/Calcium_imaging

    Cells loaded with an indicator, or expressing it in the case of a GECI, [42] can be viewed using a fluorescence microscope and captured by a Scientific CMOS (sCMOS) [43] camera or CCD camera. Confocal and two-photon microscopes provide optical sectioning ability so that calcium signals can be resolved in microdomains such as dendritic spines or ...

  5. Point spread function - Wikipedia

    en.wikipedia.org/wiki/Point_spread_function

    By virtue of the linearity property of optical non-coherent imaging systems, i.e., . Image(Object 1 + Object 2) = Image(Object 1) + Image(Object 2). the image of an object in a microscope or telescope as a non-coherent imaging system can be computed by expressing the object-plane field as a weighted sum of 2D impulse functions, and then expressing the image plane field as a weighted sum of the ...

  6. Confocal endoscopy - Wikipedia

    en.wikipedia.org/wiki/Confocal_endoscopy

    Similar to confocal microscopy, the laser in CLE filtered by the pinhole excites the fluorescent dye through a beam splitter and objective lens. The fluorescent emission then follows similar paths into the detector. A pinhole is used to select emissions from the desired focal plane. Two categories of CLE exist, namely probe-based (pCLE) and the ...

  7. Fluorescence-lifetime imaging microscopy - Wikipedia

    en.wikipedia.org/wiki/Fluorescence-lifetime...

    Fluorescence-lifetime imaging microscopy or FLIM is an imaging technique based on the differences in the exponential decay rate of the photon emission of a fluorophore from a sample. It can be used as an imaging technique in confocal microscopy , two-photon excitation microscopy , and multiphoton tomography.

  8. Diffraction-limited system - Wikipedia

    en.wikipedia.org/wiki/Diffraction-limited_system

    In a digital camera, diffraction effects interact with the effects of the regular pixel grid. The combined effect of the different parts of an optical system is determined by the convolution of the point spread functions (PSF). The point spread function of a diffraction limited circular-aperture lens is simply the Airy disk. The point spread ...

  9. Single-molecule FRET - Wikipedia

    en.wikipedia.org/wiki/Single-molecule_FRET

    Data collection with cameras will produce movies of the specimen which must be processed to derive the single-molecule intensities with time. If a confocal microscope with a SPAD detector is used, molecule searching is done first by scanning the sample. Then the confocal point sits on a molecule and collects intensity-time data directly, giving ...

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