DH 1050 Radiology lecture

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  1. Define X-ray
    a beam of energy that has the power to penetrate substances and record image shadows on photographic film
  2. Define Radiograph
    a picture on film 2 dimensional of a 3 dimensional object - a picture produced by the passage of x-rays through an object or body
  3. Ways to use dental radiographs
    • to localize lesions or foreign objects
    • to provide information during the dental procedure, to evaluate growth and development, to detect lesions, diseases, and conditions of the teeth and surrounding structures that cannot be identified clinically
  4. Who discovered x-rays on what date
    roentgen (renken) November 8, 1895
  5. Name the structures of an atom
    Nucleus - houses protons and neutrons which are positive, Orbitals house electrons which are negetive charge
  6. define ionization
    what produces x-rays. the production of ions, or the process of converting an atom into ions
  7. define radiation
    the emission and propagation of energy through space or a substance in the form of waves or particles
  8. radioactivity define
    NOT the same thing as radiation.  The procwss by which certain unstable atoms or elements undergo spontaneous disintegration or decay in an effort to attain a more balanced nuclear state
  9. Define particulate radiation
    tiny particles of matter that possess mass and travel in straight line and at high speeds
  10. what particles and rays are in particulate radiation
    Electrons - beta particles (originate in nucleus) and Cathode rays (use in x-ray tube)
  11. Particle concept in electromagnetic radiation
    discrete bundles of energy called "photons" that have no mass or weight and travel as waves at the speed of light and move through space in a straight line carrying the energy of electromagnetic radiation
  12. Wave concept in electromagnetic radiation
    characterizes electromagnetic radiation as waves velocity=speed of wave, wavelength= distance between the rest of each wave, frequency= the number of wavelengths that pass a given point in a certain amount of time
  13. define x-ray
    weightless bundles of energy (photons) without an electrical charge that travel in waves with a specific frequency at the speed of light.  x-ray photons interact with materials they penetrate and cause ionization
  14. properties of x-rays
    • charge - no
    • appearance- invisible, absorption- yes absorbed by tissues
    • mass- no
    • path of travel-straight lines, penetrating power- yes
    • speed- speed of light
    • effect on living cells-yes, effect on film- yes
    • ionization capability-yes
    • focusing capability- can't focus to a specific point, fluorescence capability- yes actually makes the picture
    • Wavelength- really close so penetrate
  15. X-ray machine component parts
    Control panel, extension arm, tubehead
Card Set:
DH 1050 Radiology lecture
2014-08-26 03:54:55
radiology xray

Chapter 1 and Chapter 2
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