Fundamentals

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Author:
MYKE
ID:
237930
Filename:
Fundamentals
Updated:
2013-09-30 15:41:19
Tags:
kats class 30 13
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kats
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  1. Spatial resolution
    ability to image small objects that have high subject contrast, such as a bone–soft tissue interface, a breast microcalcification, or a calcified lung nodule
  2. Smaller focal spot =
    better spatial resolution
  3. Smaller area =
    less area to dissipate heat
  4. Three things are needed in the x-ray tube for x-ray production:
    • a large potential difference to give kinetic energy to filament electrons (provided by the kVp setting),
    • a vehicle on which kinetic energy can ride (source of electrons provided by mAs),
    • and a place for interaction (the anode target).
  5. Potential difference =
    The amount of energy per unit charge needed to move a charged particle from a reference point to a designated point
  6. how many directions do electrons flow
    Electrons flow in only one direction in the x-ray tube—from cathode to anode.
  7. what is the flow of electrons called and how is i measured
    This flow of electrons is called the tube current and is measured in milliamperes (mA)
  8. how much of the electrons energy is converted into heat after hiting the anode taarget
    As electrons strike the anode target, approximately 99% of their kinetic energy is converted to heat
  9. 2 types of Target interactions are called
    • 1. Characteristic
    • 2. Bremsstrahlung
  10. if the photons have enouh energy to knock out the K shell it is called
    target characteristic interaction
  11. energy released by the computation of electrons is called
    photons
  12. the swinging around the nucleus releasing energy  as it changes direction phonton what is this called
    Bremsstrahlung characteristic

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