1 / 8

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

malana
Télécharger la présentation

RAD 354 Chapt 7 X-ray Production

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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

  2. X-rays are made via two ways • Brems

  3. Characteristic

  4. 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

  5. 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

  6. 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

  7. 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

  8. Wave forms • Half wave • Full wave • 3 phase • 6 pulse • 12 pulse High frequency generators

More Related