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In conventional CT machines, an X-ray tube and detector are physically rotated behind a circular shroud (see the image above right). An alternative, short lived design, known as electron beam tomography (EBT), used electromagnetic deflection of an electron beam within a very large conical X-ray tube and a stationary array of detectors to achieve very high temporal resolution, for imaging of ...
Both medical CT and OPT compute 3D volumes based on transmission of the photon through the material of interest. Given that the tissue is typically opaque in the ultraviolet, visible, and near-infrared spectrum, the tissue must first be made clear with an optical clearing agent, so that the light can pass through.
Industrial computed tomography (CT) scanning is any computer-aided tomographic process, usually X-ray computed tomography, that uses irradiation to produce three-dimensional internal and external representations of a scanned object. Industrial CT scanning has been used in many areas of industry for internal inspection of components.
For example, the sequential model of the indexed loop is usually represented as a table of cells, with similar formulas (normally differing only in which cells they reference). Spreadsheets have evolved to use scripting programming languages like VBA as a tool for extensibility beyond what the spreadsheet language makes easy.
Examples such as Ulf Grenander's Sieve estimator [9] [10] or Bayes penalty methods, [11] [12] or via I.J. Good's roughness method [13] [14] may yield superior performance to expectation-maximization-based methods which involve a Poisson likelihood function only. As another example, it is considered superior when one does not have a large set of ...
The IAEA later confirmed in a confidential report to member states the accleration in enrichment, a process that refines the raw material so that it can be used as fuel in civil nuclear power ...
The soon-to-be 47th commander-in-chief is the second president in US history to win a second nonconsecutive term after Glover Cleveland. Trump is now working to staff up his second administration.
This technique may be used to detect tumours because tumour cells sometime process the isotopes differently. [2] The imaging agent used in SPECT emits gamma rays, as opposed to the positron emitters (such as 18 F) used in PET. There are a range of radiotracers (such as 99m Tc, 111 In, 123 I, 201 Tl) that can be used, depending on the specific ...