Rad 354 chapt 7 x ray production
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RAD 354 Chapt 7 X-ray Production. The primary purpose of an x-ray tube is to accelerate electrons across the tube and suddenly stop them in the target to produce electromagnetic x-ray photons 99% of the electrical energy is dissipated as heat

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RAD 354 Chapt 7 X-ray Production

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Rad 354 chapt 7 x ray production

RAD 354 Chapt 7 X-ray Production

  • The primary purpose of an x-ray tube is to accelerate electrons across the tube and suddenly stop them in the target to produce electromagnetic x-ray photons

    • 99% of the electrical energy is dissipated as heat

    • mAs DIRECTLY affects the AMOUNT of photons produced

    • kVp makes the PRODUCTION of x-rays “slightly” more efficient


X rays are made via two ways

X-rays are made via two ways

  • Brems


Characteristic

Characteristic


X rays produced

X-rays produced

  • X-rays are emitted “isotropically” (in all directions)

  • The x-ray beam is “Polychromatic” (many energies

  • MAX energy is produced by min wavelength

    • Duane-Hunt Law 12.4/kVp = min. wavelength


Kvp effects

kVp effects

  • kVp increase is equal to the “square of the factor by which kVp is raised”

  • kVp increases

    • Results in increased energies at ALL levels

    • The GREATER the increase, the GREATER the energies

    • Increases “skew” the x-ray emission spectrum to the RIGHT


Filtration

Filtration

  • Inherent - .5mm al equiv. (will increase over time as tungsten “boils off and coats” the window

  • Added – 2.0 al added for the 70-80 kVp level

  • Total filtration is the SUM of inherent and added

    • INCREASES the average “hardness” of the beam

    • Does NOT INCREASE any photon’s energy, only raises the AVERAGE hardness


Target thoughts

Target thoughts

  • Increasing the atomic # of the rarget (anode) will INCREASE the production of x-rays

  • INCREASE in mAs = INCREASE in numbers of PHOTONS

  • INCREASE in kVp = INCREASE in QUALITY and slight increase in production efficiency of x-rays


Wave forms

Wave forms

  • Half wave

  • Full wave

  • 3 phase

    • 6 pulse

    • 12 pulse

      High frequency generators


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