Binary Tomography Reconstruction by Particle Aggregation

The size range of mineral and ceramic particles of one to a few microns is awkward to prepare for examination by TEM. Electrons can be transmitted through smaller particles directly and larger particles can be thinned by crushing and dispersion onto a substrate or by embedding in a film followed by ion milling. Attempts at dispersion onto a thin film substrate often result in particle aggregation by van der Waals attraction. In the present work we studied 1-10 μm diameter Al2O3 spheres which were transformed from the amprphous state to the stable α phase.After the appropriate heat treatment, the spherical powders were embedded in as high a density as practicable in a hard EPON, and then microtomed into thin sections. There are several advantages to this method. Obviously, this is a rapid and convenient means to study the microstructure of serial slices. EDS, ELS, and diffraction studies are also considerably more informative. Furthermore, confidence in sampling reliability is considerably enhanced. The major negative feature is some distortion of the microstructure inherent to the microtoming operation; however, this appears to have been surprisingly small. The details of the method and some typical results follow.

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Fibrinogen derivatives in particle aggregation by peritoneal contents

Pathology ◽

10.1080/00313027109073738 ◽

1971 ◽

Vol 3 (3) ◽

pp. 227-231 ◽

Cited By ~ 1

Author(s):

Stephen Fisher ◽

Josephine L. Backhouse

Keyword(s):

Particle Aggregation

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Embedded Gold Markers for Improved TEM/STEM Tomography Reconstruction

ISTFA 2008: Conference Proceedings from the 34th International Symposium for Testing and Failure Analysis ◽

10.31399/asm.cp.istfa2008p0172 ◽

2008 ◽

Author(s):

Jian-Shing Luo ◽

Chia-Chi Huang ◽

Jeremy D. Russell

Keyword(s):

3D Reconstruction ◽

Feature Tracking ◽

Semiconductor Device ◽

Electron Tomography ◽

Tracking Process ◽

Carbon Coated ◽

Novel Method ◽

Tomography Reconstruction ◽

Tilt Series ◽

20 Nm

Abstract Electron tomography includes four main steps: tomography data acquisition, image processing, 3D reconstruction, and visualization. After acquisition, tilt-series alignments are performed. Two methods are used to align the tilt-series: cross-correlation and feature tracking. Normally, about 10-20 nm of fiducial markers, such as gold beads, are deposited onto one side of 100 mesh carbon-coated grids during the feature-tracking process. This paper presents a novel method for preparing electron tomography samples with gold beads inside to improve the feature tracking process and quality of 3D reconstruction. Results show that the novel electron tomography sample preparation method improves image alignment, which is essential for successful tomography in many contemporary semiconductor device structures.

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MI-Net: A Deep Network for Non-linear Ultrasound Computed Tomography Reconstruction

2020 IEEE International Ultrasonics Symposium (IUS) ◽

10.1109/ius46767.2020.9251441 ◽

2020 ◽

Author(s):

Yuling Fan ◽

Hongjian Wang ◽

Hartmut Gemmeke ◽

Juergen Hesser

Keyword(s):

Computed Tomography ◽

Deep Network ◽

Ultrasound Computed Tomography ◽

Non Linear ◽

Tomography Reconstruction ◽

Computed Tomography Reconstruction

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Aneurysm Arising at the Origin of a Duplicated Middle Cerebral Artery

Case Reports in Neurology ◽

10.1159/000517366 ◽

2021 ◽

pp. 446-450

Author(s):

Jean Roch Alliez ◽

Luis Manera

Keyword(s):

Computed Tomography ◽

Subarachnoid Haemorrhage ◽

Middle Cerebral Artery ◽

Cerebral Artery ◽

World Federation ◽

Treatment Procedure ◽

3D Computed Tomography ◽

Ruptured Aneurysms ◽

Tomography Reconstruction ◽

Computed Tomography Reconstruction

A duplicated middle cerebral artery (DMCA) is a common anomaly. However, aneurysms arising from the origin of a DMCA are extremely rare. A 22-year-old female was admitted to our hospital with a World Federation of Neurosurgical Societies grade 2 subarachnoid haemorrhage. Four-vessel angiography revealed a DMCA and an aneurysm arising from the origin of this artery. The aneurysm was successfully treated by embolization, and the patient was discharged 2 weeks later. Ruptured aneurysms arising from the origin of a DMCA can be successfully treated by embolization. These aneurysms are small and 3D-computed tomography reconstruction is mandatory to detect them. It is important to preserve the DMCA during the treatment procedure.

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718. Renneting and the caseinate particle: a viscometric study

Journal of Dairy Research ◽

10.1017/s0022029900009304 ◽

1958 ◽

Vol 25 (2) ◽

pp. 307-311 ◽

Cited By ~ 3

Author(s):

C. Sterling

Keyword(s):

Calcium Ions ◽

Particle Aggregation ◽

High Dilutions ◽

Higher Temperature ◽

Viscometric Study ◽

Sodium And Potassium

A viscometric study of solutions of alkaline (sodium and potassium) caseinate was made to determine the effects of renneting with and without the addition of calcium ions. There was no real viscometric effect of these treatments at high dilutions. At a higher temperature, the viscosity increment of the solutions decreased. It was suggested that particle aggregation occurs more readily at higher temperatures, leading to a greater particle symmetry as well as causing some dehydration.

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