Topic
Contrast transfer function
About: Contrast transfer function is a research topic. Over the lifetime, 934 publications have been published within this topic receiving 26533 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the effect of various parameters on contrast in an electron microscope image was analyzed and a simplified formula tested, and the dependence of contrast on the weight per unit area, voltage, and aperture was found to be in good agreement with the theory of electron scattering.
Abstract: The effect of various parameters on contrast in an electron microscope image is analyzed and a simplified formula tested. The dependence of contrast on the weight per unit area, voltage, and aperture is in good agreement with the theory of electron scattering. The observed dependence of screening angle on atomic number deviates from the theory for higher atomic numbers, but carbon and elements of comparable atomic number are not affected. The application of quantitative electron microscopy to biological objects can be considered workable to ±10%.
26 citations
TL;DR: In this paper, the total illumination in a diffraction image containing spherical aberration was studied for various amounts of third and fifth-order aberration, and the Zernike polynomials were used to represent spherical aberrations.
Abstract: The total illumination (or encircled energy) in a diffraction image containing spherical aberration is studied for various amounts of third- and fifth-order aberration. The Zernike polynomials are used to represent spherical aberration. The evaluation of the total illumination was done numerically, using double Gauss quadrature and 49 quadrature points. Contour maps of the total illumination were constructed and compared with the aberration-free case examined previously by E. Wolf.
26 citations
01 Jan 1998
TL;DR: In this article, the advantages of using a configured detector to obtain differential phase contrast image in a scanning transmission X-ray microscope are described, and a prototype system using a CCD detector has been installed on the microscopy beamline at BESSY, and the first images have been acquired.
Abstract: The advantages of using a configured detector to obtain differential phase contrast image in a scanning transmission X-ray microscope are described. A prototype system using a CCD detector has been installed on the microscopy beamline at BESSY, and the first images have been acquired.
25 citations
TL;DR: A novel obstruction-free anamorphotic phase shifter is proposed which enables one to shift the phase of the scattered wave by an arbitrary amount over a large range of spatial frequencies.
25 citations
Patent•
18 Apr 1996TL;DR: In this paper, a charge coupled device X-ray sensor and camera capable of imaging with high modulation transfer function for high resolution is used to achieve high resolution by simultaneously measuring the modulation transfer functions of x-ray and visible images while imaging the target or the scene.
Abstract: Charge coupled device X-ray sensor and camera capable of imaging with high modulation transfer function for high resolution. The high resolution is achieved by a method of simultaneously measuring the modulation transfer functions of x-ray and visible images while imaging the target or the scene. Then, by using the point spread function and measured MTFs at various spatial frequencies to calculating spatial frequency dependent correction table or correction parameters. This correction is applied to the raw image of the target inside a workstation using a software embodiment of the correction algorithm. The high precision, multi-spatial frequency patterns that are used in x-ray image correction are provided on the sensor, the scintillator screen and the fiber optic face plate of a sensor device to enable the user of the workstation to measure the modulation transfer functions (contrast transfer function) in the horizontal, vertical and in oblique orientations at several spatial frequencies.
25 citations