What is electron ptychography?
Abstract. Ptychography is a coherent diffractive imaging technique that can determine how an electron wave is transmitted through an object by probing it in many small overlapping regions and processing the diffraction data obtained at each point.
How does ptychography work?
It generates images by processing many coherent interference patterns that have been scattered from an object of interest. Unlike conventional lens imaging, ptychography is unaffected by lens-induced aberrations or diffraction effects caused by limited numerical aperture.
What is tomographic data?
1. Data acquired by radiologic / nuclear medicine imaging techniques for making detailed three-dimensional images of a plane section of a solid object.
Is ultrasound a tomographic?
On the other hand, since ultrasound uses time-of-flight to spatially encode the received signal, it is not strictly a tomographic method and does not require multiple acquisitions at all.
What is tomographic image?
Tomography is imaging by sections or sectioning through the use of any kind of penetrating wave. In many cases, the production of these images is based on the mathematical procedure tomographic reconstruction, such as X-ray computed tomography technically being produced from multiple projectional radiographs.
What is tomographic angle?
Tomography (Fig. Conventional tomography is now less commonly used because of the availability of cross-sectional imaging techniques such as US, CT, and MRI. The amplitude of tube traveling is measured in degrees (tomographic angle). • The wider the angle, the thinner the section.
What is tomographic section?
Tomographic section means the volume of an object whose x-ray attenuation properties are imaged in a tomogram. Tomographic section means the volume of an object whose x-ray attenuation properties are imaged in a tomogram. “Tube” means an x-ray tube, unless otherwise specified.
What is tomographic ultrasound imaging?
Methods: A new technology, tomographic ultrasound imaging (TUI), allows the examiner to obtain a volume data set that simultaneously displays multiple images at specific distances from the 4-chamber view.
Where is tomographic from?
the UK
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How did ptychography improve the resolution of electron microscopy?
Cornell University enhanced electron microscopy using a technique known as ptychography in 2018. At the time, it allowed an electron microscope to resolve things three times smaller than previously possible. But that wasn’t enough. The team has now doubled that resolution by improving on their previous work.
Where are the image and the aperture located in ptychography?
An aperture in the image plane acts equivalently to the illumination in conventional ptychography, while the image corresponds to the specimen. The detector lies in the Fraunhofer or Fresnel diffraction plane downstream of the image and aperture.
How is ptychography used in diffractive imaging?
Ptychography is a high resolution, scanning-based coherent diffractive imaging (CDI) technique. The sample is illuminated with a focused, coherent (laser-like) X-ray beam and small angle scattering patterns are collected as the sample is raster scanned through the beam.
Can a ptychography data set be posed as a blind deconvolution problem?
The ptychographical data set can be posed as a blind deconvolution problem. It has sufficient diversity to solve for both the moving functions (illumination and object), which appear symmetrically in the mathematics of the inversion process.