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objective of taking a radiograph

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to achieve best diagnostic info with the least amount of radiation exposure

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x ray is

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a type of electromagnetic radiation that has a wave of high energy and a very short wavelength

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20 Terms

1
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objective of taking a radiograph

to achieve best diagnostic info with the least amount of radiation exposure

2
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x ray is

a type of electromagnetic radiation that has a wave of high energy and a very short wavelength

3
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electromagnetic radiation 2 behaviors

  • travels in waves with a wavelength and frequency

  • behaves like particles

4
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the shorter the wavelength

  • the higher the frequency

    • the more penetrating power it has

5
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absorbed dose

the amount of energy transmited by ionizing x-rays to matter

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dose equivalent

a measure of the biological damage to living tissue as a result of radiation exposure

7
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gray

absorbed dose is measurement unit

8
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sievert

dose equivalent measurement unit

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maximum permissible dose

maximum dose of radiation that a person may be occupationally exposed to in a given amount of time without significant risk of side effects

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occupationally exposed limit is

0.05 Sv

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5 things needed to produce x-rays

  • vacuum containment area

  • target for electrons to strike

  • means of accelerating electrons

  • source of electrons

  • free electron path

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cathode charge

negative

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tungsten filament

in the cathode, when heated creates an electron cloud

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focusing cup

  • in the cathode

  • made from molybdenum

  • contains the electron cloud

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anode charge

positive

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target

  • in the anode

  • made of tungsten

  • contains a focal spot

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focal spot

  • the point of the target that electrons hit

  • x-rays and heat are produced when hit

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rotating anodes

  • distribute heat better than stationary

    • produce more x rays

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mA

  • voltage used to heat the filament

  • the more mA the more electrons and then xrays

20
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kVp

  • measure of voltage of the step up ciurcut that accelerate the electrons to the target

  • the higher the kVp the better the penetrating power of the x rays