共查询到15条相似文献,搜索用时 140 毫秒
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荧光共焦扫描系统成像特性的优化 总被引:8,自引:0,他引:8
对荧光共焦扫描系统用光强点扩散函数进行傅里变换得到系统三维传递函数的数学模型,并由此求得环形透镜和各种有限大小探测器系统的光学传递函数。用计算机模拟和光学传递九数值计算,分析了采用不同环形透镜及探测器对系统成像特性的影响 相似文献
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《中国光学与应用光学文摘》2006,(2)
眼镜、放大镜、显微镜、望远镜TH742.652006021689高斯光束荧光共焦显微镜的三维光学传递函数=Opticaltransfer function of a fluorescent confocal microscope withextended Gaussian source[刊,中]/杨初平(华南农业大学理学院.广东,广州(510642))∥激光技术.—2005,29(5).—552-554研究高斯光源的束斑半径、光源孔径和探测器孔径对荧光共焦显微镜3-D OTF的影响,获得了具有有限光源孔径、探测器孔径和束斑半径的荧光共焦显微镜的三维光学传递函数(3-D OTF)。数值计算结果表明,束斑半径影响到光源孔径和探测器孔径的选择,与采用平行光… 相似文献
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双光子荧光显微镜作为一种高分辨光学仪器,已经被广泛应用于生物样品的非侵入式三维光学成像中。相比共聚焦显微镜,双光子荧光显微镜拥有更深的探测深度。然而,即便如此,在对较厚的生物样品进行非侵入式光学三维成像时,样品的成像质量也往往会随着探测深度的增加而下降。在临床和生物学领域对研究母性遗传起重要作用的小鼠卵母细胞拥有较大的直径(80~100 μm),吸收和散射效应较为明显。本文研究小鼠卵母细胞染色体的三维双光子荧光图像随探测深度增加图像质量的衰减程度。通过对所得图像进行轴向衰减矫正,利用体积作为参数,将矫正前后小鼠卵母细胞内染色体三维双光子荧光图像进行对比。结果表明,由于吸收和散射效应,卵母细胞存在较严重的光学轴向衰减问题,因此,对用双光子荧光三维成像手段获得的小鼠卵母细胞图像进行衰减矫正是有必要的。这为进一步精确定量的研究卵母细胞内染色体的三维构像打下良好的基础。 相似文献
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在研制用于对厚的生物样品进行光学断层成像的共焦扫描荧光显微镜时,由于成像信号十分微弱及存在很强的多次散射作用,因此杂散光的抑制非常重要,而信噪比、信号背景比就成为决定能否获得高对比度、高分率图像的关键。运用光学信息量的概念,在已有的光学成像系统信息量计算、共焦扫描荧光显微镜信噪比及传递函数计算的基础上,详细分析了共焦扫描荧光显微镜信息量与信噪比等之间的定量关系。该关系表明,为了充分利用共焦扫描荧光显微镜的成像性能,必须选择适当的探测小孔。所得的结果对于共焦扫描荧光显微成像系统的研制有重要的实用价值。 相似文献
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Nicolas Sandeau 《Optics Communications》2006,264(1):123-129
The main advantage of two-photon fluorescence confocal microscopy is the low absorption obtained with live tissues at the wavelengths of operation. However, the resolution of two-photon fluorescence confocal microscopes is lower than in the case of one-photon excitation. The 4Pi microscope type C working in two-photon regime, in which the excitation beams are coherently superimposed and, simultaneously, the emitted beams are also coherently added, has shown to be a good solution for increasing the resolution along the optical axis and for reducing the amplitude of the side lobes of the point spread function. However, the resolution in the transverse plane is poorer than in the case of one-photon excitation due to the larger wavelength involved in the two-photon fluorescence process. In this paper we show that a particular arrangement of the 4Pi microscope, referenced as 4Pi′ microscope, is a solution for obtaining a lateral resolution in the two-photon regime similar or even better to that obtained with 4Pi microscopes working in the one-photon excitation regime. 相似文献
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Theoretical investigation on Raman induced kerr effect spectroscopy in nonlinear confocal microscopy
The imaging theory of Raman induced Kerr effect spectroscopy (RIKES) in nonlinear confocal microscopy is presented in this
paper. Three-dimensional point spread function (3D-PSF) of RIKES nonlinear confocal microscopy in isotropic media is derived
with Fourier imaging theory and RIKES theory. The impact of nonlinear property of RIKES on the spatial resolution and imaging
properties of confocal microscopy have been analyzed in detail. It is proved that RIKES nonlinear confocal microscopy can
simultaneously provide more information than two-photon confocal microscopy concerning molecular vibration mode, vibration
orientation and optically induced molecular reorientation, etc. It is shown that RIKES nonlinear confocal microscopy significantly
enhances the spatial resolution and imaging quality of confocal microscopy and achieves much higher resolution than that of
two-photon confocal microscopy. 相似文献
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TANG Zhilie XING Da & LIU Songhao . Department of Physics South China Normal University Guangzhou China . School for Information Optoelectronic Science Engineering South China Normal University Guangzhou China Correspondence should be addressed to Tang Zhilie 《中国科学G辑(英文版)》2004,47(1):8-16
ItisreportedrecentlythatnonlinearopticalphenomenonofSHGandTHGhasbeenobservedinmanybiologicaltissues[16].SHGandTHGhavebeenusedtoperformthethree-dimensionalimaginginlivingtissuesandhaveattractedmuchattentionrecently.TherearemanyadvantagesofusingSHGandTHGtoperformthethree-dimensionalimaginginlivingtissues,suchasnoninvasiveandnophotobleaching,inadditiontotheimagingpropertiesofmulti-photonfluorescenceimaging[7—9].Firstly,unlikeinthesingle-andmulti-photonfluorescenceprocesses,onlyvirtualstat… 相似文献
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Light-sheet-based microscopy [single-plane illumination microscope (SPIM)] performs very well at low numerical apertures. It complements conventional (FM), confocal (CFM), and two-photon fluorescence microscopy (2hnu-FM) currently used in modern life sciences. Lateral and axial SPIM point spread function (PSF) extents are measured by using fluorescent beads to determine the 3D resolution. The results are compared with values derived from an analytical theory and numerical simulations. The discrepancies are found to be less than 5%. The axial extent of a SPIM-PSF (10x/0.3 W) is approximately 5.7 microm. This value is almost a factor of 2 smaller than in CFM, more than 2.5 times smaller than in FM, and more than three times smaller than in 2hnu-FM. SPIM outperforms 2hnu-FM and FM, while CFM has a better axial resolution at NAs above 0.8. 相似文献
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Two-photon excitation provides efficient optical sectioning in three-dimensional fluorescence microscopy, independently of a confocal detection. In two-photon laser-scanning microscopy, the image resolution is governed by the volume of the excitation light spot, which is obtained by focusing the incident laser beam through the objective lens of the microscope. The light spot being strongly elongated along the optical axis, the axial resolution is much lower than the transverse one. In this Letter we show that it is possible to strongly reduce the axial size of the excitation spot by shaping the incident beam and using a mirror in place of a standard glass slide to support the sample. Provided that the contribution of sidelobes can be removed through deconvolution procedures, this approach should allow us to achieve similar axial and lateral resolution. 相似文献