computed tomography

(noun)

(CT) - A form of radiography which uses computer software to create images, or slices, at various planes of depth from images taken around a body or volume of interest.

Related Terms

  • nuclear magnetic resonance
  • magnetic resonance imaging

Examples of computed tomography in the following topics:

  • NMR and MRIs

    • Magnetic resonance imaging (MRI), also called nuclear magnetic resonance imaging (NMRI) or magnetic resonance tomography (MRT), is a medical imaging technique used in radiology to visualize internal structures of the body in detail.
    • MRI shows a marked contrast between the different soft tissues of the body, making it especially useful in imaging the brain, the muscles, the heart, and cancerous tissue—as compared with other medical imaging techniques such as computed tomography (CT) or X-rays.
  • Emission Topography

    • Positron emission tomography is a nuclear medical imaging technique that produces a three-dimensional image of processes in the body.
    • Positron emission tomography (PET) is a nuclear medical imaging technique that produces a three-dimensional image or picture of functional processes in the body.
    • Three-dimensional images of tracer concentration within the body are then constructed by computer analysis.
    • A technique much like the reconstruction of computed tomography (CT) and single-photon emission computed tomography (SPECT) data is more commonly used, although the data set collected in PET is much poorer than CT, so reconstruction techniques are more difficult.
    • Discuss possibility of uses of positron emission tomography with other diagnostic techniques.
  • X-Ray Imaging and CT Scans

    • CT Scans use the assistance of a computer to take this information, and generate 3 dimensional images.
    • Tomography refers to imaging by sections, or sectioning. demonstrates this concept.
    • CT scans, or computed tomography scans use a combination of X-ray radiography and tomography to produce slices of areas of the human body.
  • Radiation Detection

    • Scintillators can also be used in neutron and high-energy particle physics experiments, new energy resource exploration, x-ray security, nuclear cameras, computed tomography, and gas exploration.
    • Other applications of scintillators include CT scanners and gamma cameras in medical diagnostics, screens in computer monitors, and television sets.
  • Matter and Antimatter

    • Matter-antimatter reactions have practical applications in medical imaging, such as in positron emission tomography (PET).
  • Cathode Ray Tube, TV and Computer Monitors, and the Oscilloscope

    • Early computer terminal monitors used only green phosphors.
    • In television sets and computer monitors, the entire front area of the tube is scanned repetitively and systematically in a fixed pattern called a raster .
    • Although a mainstay of display technology for decades, CRT-based computer monitors and televisions constitute a dead technology.
    • The rapid advances and falling prices of LCD flat panel technology, first for computer monitors and then for televisions, has been the key factor in the demise of competing display technologies such as CRT, rear-projection, and plasma display.
    • The color of the oscilloscope phosphor is much less important than in the case of color televisions or computer monitors since the primary purpose is to evaluate signal voltages rather than construct complex images; however, the persistence of the phosphor may be more important.
  • Implications of Quantum Mechanics

    • Furthermore, most of the calculations performed in modern computational chemistry rely on quantum mechanics.
    • A more distant goal is the development of quantum computers, which are expected to perform certain computational tasks exponentially faster than classical computers.
  • The Discrete Fourier Transform

    • Now we will compute the coefficients in such a way that $p$ interpolates (i.e., fits exactly) the data at each $x_k$ :
    • But since sines/cosines are orthogonal, the $c_n$ coefficients can be computed directly:
    • In the handout you will see some Mathematica code for computing and displaying discrete Fourier transforms.
  • Sound Systems, Computer Memory, Seismograph, GFCI

    • Inductance in modern electronics is also used in computer memory.
  • A few examples

    • Compute the row-reduced form of $A$ and $A^T$ .
    • Compute the particular solution of this system by setting the free variable(s) equal to zero.
    • Compute the eigenvalues and eigenvectors of this matrix.
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