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.
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TL;DR: In this paper, the Marechal aberration balancing theory is extended to annular apertures and the transfer function of an annular aperture in the presence of spherical aberration and defocusing is evaluated.
Abstract: The transfer function of an annular aperture in the presence of spherical aberration and defocusing is evaluated. The technique employed is the sampling method developed in a previous paper. The Marechal aberration-balancing theory is extended to annular apertures. Representative numerical results are discussed.
39 citations
TL;DR: A computational algorithm based on constrained non‐linear optimization is developed to estimate the essential parameters in the CTF and envelope function model simultaneously and automatically.
Abstract: The three-dimensional reconstruction of macromolecules from two-dimensional single-particle electron images requires determination and correction of the contrast transfer function (CTF) and envelope function. A computational algorithm based on constrained non-linear optimization is developed to estimate the essential parameters in the CTF and envelope function model simultaneously and automatically. The application of this estimation method is demonstrated with focal series images of amorphous carbon film as well as images of ice-embedded icosahedral virus particles suspended across holes.
38 citations
TL;DR: The JEOL 2100F-LM electron microscope is well-suited for studies of magnetic materials, or for semi-conductor dopant profiling, where a large hologram width and fine fringe spacing are obtained with good contrast.
37 citations
TL;DR: In this article, an algorithm for determination and correction of the coherent wave aberration has been developed which is based on a combination of genetic algorithm and downhill-simplex algorithm, the basic criterion is the minimization of the amplitude contrast which is a well established correction guideline for weak phase objects.
37 citations
TL;DR: In this paper, the authors derived analytical expressions for the chromatic and spherical aberration point spread functions of an electron lens, taking into account the angular distribution of inelastic scattering and energy distribution of the electrons forming the image.
37 citations