The Dependence of Sample Thickness on Annular Bright Field Microscopy

2011 ◽  
Vol 5 (1) ◽  
Author(s):  
M.M.G. Latting ◽  
W. Walkosz ◽  
R.F. Klie
Keyword(s):  
Image Quality ◽  
Visual Information ◽  
Specific Property ◽  
Dark Field ◽  
Sample Thickness ◽  
Atomic Resolution ◽  
Imaging Method ◽  
Bright Field ◽  
Dark Field Imaging ◽  
Field Imaging

Annular Bright Field (ABF) is a relatively new method of Scanning Transmission Electron Microscopy (STEM) imaging that is desirable because of its ability to provide additional visual information in terms of showing lightweight atoms, whereas standard dark field imaging does not. In order to better understand the parameters necessary to perfect this method, this research article aimed to study a specific property of this imaging method: the dependence of sample thickness on image quality and atomic resolution. Multislice calculations were utilized to generate atomic potentials that were used to simulate different thicknesses of β-Si3N4. The resulting images were then examined to measure atomic full width at half-maximum (FWHM) in order to have a quantifiable value to support visual selection of the best ABF output image. Comparison of image quality/atomic resolution and FWHM values suggested that as a general trend, as sample thickness increases, atomic resolution and image quality deteriorate, citing Huygens' Principle of Classical Optics via the propagation of spherical electron waves through a vacuum. This study will bring a new awareness to the necessary precision required by researchers' sample preparation during Annular Bright Field imaging to yield the best image of their respective samples.

Dreidimensional abbildende Elektronenmikroskope I. Prinzip der Geräte / Threedimensionally Imaging Electron Microscopes

1972 ◽  
Vol 27 (6) ◽  
pp. 919-929 ◽  
Author(s):  
W. Hoppe
Keyword(s):  
Dark Field ◽  
Imaging Systems ◽  
Atomic Resolution ◽  
Small Object ◽  
Fourier Space ◽  
Bright Field ◽  
Image Construction ◽  
Dark Field Imaging ◽  
Electron Microscopes ◽  
Field Imaging

Abstract Threedimensionally Imaging Electron Microscopes The principles of new electron optical imaging systems will be described which make possible the threedimensional image construction of a small object. Data of threedimensional Fourier space are collected by the registration of several images using primary beams with different tilting angles. The simplest device of such a type - a magnetic fly's eye system - will lead to spherical aberrrations larger than about 20 mm. It will be shown, that there is a good chance to correct “ring zone segment”-systems to reach atomic resolution with or without image-reconstruction-calculations. Not only microscopes with conventional bright field and dark field imaging but also transmission scanning microscopes can be constructed usind these principles.

scholarly journals Correlation of image quality parameters with tube voltage in X-ray dark-field chest radiography: a phantom study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Andreas P. Sauter ◽  
Jana Andrejewski ◽  
Manuela Frank ◽  
Konstantin Willer ◽  
Julia Herzen ◽  
...  
Keyword(s):  
Image Quality ◽  
Imaging Modality ◽  
Signal Strength ◽  
Dark Field ◽  
Tube Voltage ◽  
X Ray ◽  
Dose Area Product ◽  
Dark Field Imaging ◽  
Field Imaging

AbstractGrating-based X-ray dark-field imaging is a novel imaging modality with enormous technical progress during the last years. It enables the detection of microstructure impairment as in the healthy lung a strong dark-field signal is present due to the high number of air-tissue interfaces. Using the experience from setups for animal imaging, first studies with a human cadaver could be performed recently. Subsequently, the first dark-field scanner for in-vivo chest imaging of humans was developed. In the current study, the optimal tube voltage for dark-field radiography of the thorax in this setup was examined using an anthropomorphic chest phantom. Tube voltages of 50–125 kVp were used while maintaining a constant dose-area-product. The resulting dark-field and attenuation radiographs were evaluated in a reader study as well as objectively in terms of contrast-to-noise ratio and signal strength. We found that the optimum tube voltage for dark-field imaging is 70 kVp as here the most favorable combination of image quality, signal strength, and sharpness is present. At this voltage, a high image quality was perceived in the reader study also for attenuation radiographs, which should be sufficient for routine imaging. The results of this study are fundamental for upcoming patient studies with living humans.

Influence of spatial and temporal coherences on atomic resolution high angle annular dark field imaging

2016 ◽  
Vol 169 ◽  
pp. 1-10 ◽  
Author(s):  
Andreas Beyer ◽  
Jürgen Belz ◽  
Nikolai Knaub ◽  
Kakhaber Jandieri ◽  
Kerstin Volz
Keyword(s):  
Dark Field ◽  
Atomic Resolution ◽  
High Angle ◽  
Dark Field Imaging ◽  
Annular Dark Field ◽  
Field Imaging

scholarly journals Quantitative Annular Dark-Field Imaging at Atomic Resolution

2016 ◽  
Vol 22 (S3) ◽  
pp. 304-305
Author(s):  
Shunsuke Yamashita ◽  
Shogo Koshiya ◽  
Kazuo Ishizuka ◽  
Koji Kimoto
Keyword(s):  
Dark Field ◽  
Atomic Resolution ◽  
Dark Field Imaging ◽  
Annular Dark Field ◽  
Field Imaging

An approach to quantitative compositional profiling at near-atomic resolution using high-angle annular dark field imaging

1997 ◽  
Vol 69 (2) ◽  
pp. 83-103 ◽  
Author(s):  
S.C. Anderson ◽  
C.R. Birkeland ◽  
G.R. Anstis ◽  
D.J.H. Cockayne
Keyword(s):  
Dark Field ◽  
Atomic Resolution ◽  
High Angle ◽  
Dark Field Imaging ◽  
Annular Dark Field ◽  
Field Imaging

scholarly journals Refraction-based X-ray Computed Tomography for Biomedical Purpose Using Dark Field Imaging Method

2011 ◽  
Vol 47 (10) ◽  
pp. 459-467
Author(s):  
Naoki SUNAGUCHI ◽  
Tetsuya YUASA ◽  
Qingkai HUO ◽  
Shu ICHIHARA ◽  
Masami ANDO
Keyword(s):  
Computed Tomography ◽  
Dark Field ◽  
Imaging Method ◽  
X Ray ◽  
Dark Field Imaging ◽  
X Ray Computed ◽  
Field Imaging
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