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在透射电子显微镜中,我们经常会区分Z-Contrast Image和Phase Contrast Image,这些不同类型的图像来源于不同的成像方式:散射和衍射。 (1) 散射 电子的散射:在电子束打到样品时会产生多种不同类型的电子,如图1…
1) phase contrast image 相衬图像1. Fusion of GFP fluorescent and phase contrast images using stationary wavelet transform based variable-transparency method 基于静态小波变换的变透明度法融合GFP荧光图像与相衬图像更多例句>> 2) Phase-contrast imaging 相衬成像 1. Phase-contrast imaging with micro-focus...
We expect this s dependence to affect the image when the foil bends slightly, as is often the case for thin specimens. We also expect to see thickness variations in many-beam images, since s may be non- zero for all of the beams; s may also vary from beam to beam.chapterpreview...
phase-contrast image requires the selection of more than one beam. In general, the more beams collected, the higher the resolution of the image. However, we will see that there are reasons why some beams, which are apparently admitted through the aperture, might not contribute to the image....
We see phase contrast any time we have more than one beam contributing to the image. In fact, whenever we say "fringes," we are essentially referring to a phase-contrast phenomenon. Although we often distinguish phase and diffraction contrast, this distinction is generally artificial. For example...
关键词: Medical imaging Medical image contrast Coherence imaging Synchrotron radiation Bioinformatics 被引量: 2 摘要: X-ray devices for Phase Contrast Imaging (PCI) are often built up with the help of gratings. For large field-of-views (FOV), production cost and complexity of these gratings ...
(HREM) BFimage Objective aperture DFimage Amplitude/Diffractioncontrast HREMimage Phasecontrast BF–DFinSTEM CollectsBraggelectrons Collectsonlyelectronsscattered morethan50mrad(~3 o ). Intensity:Z-dependent. DiametersoftheFischione HAADFdetector:4-28mm. AB BF-DFinTEMmode Theeffectofvaryingthe camera...
In both methods, the image contrast is coherently generated and thus depends not only on illumination and collection angles but on defocus and specimen thickness as well. By PC-STEM, a projection of the crystal potential is obtained in thin areas, with the scattering sites being represented ...
Image sensor: pixel width Λ/2 = 5.6 µm. (e–i) Time-series charts of cross-sectional light intensity distribution simulated by FDTD. The boundary condition is the PML (perfect matched layer). Light source: wavelength λ = 850 nm, pulse width = 10 µm. Time ...