Xray production Flashcards
how are X-ray photons emitted from
the focal spot?
lead shielding
what is the collimator and what is its function?
Lead diaphragm attached to end of spacer cone
Reduces patient dose
and scatter
what are interactions at xray target?
Heat-producing
X-ray-producing interactions
Continuous radiation
what is continuous radiation?
what is characteristic radiation?
continuous -Produces a continuous range of X-ray
photon energies
characteristic-Produces specific energies of X-ray
photon, characteristic to the element used
for the target
Photons in a diagnostic X-ray beam can interact with matter in three ways?
transmission- Photon passes directly through tissue unchanged
absorption -Energy fully deposited into tissue
scatter-Photon deflected by tissue
what is Attenuation this leads to radiographic image?
determines how many photons
reach the receptor
Specific attenuation interactions?
Photoelectric effect- Photon in X-ray beam interacts with inner shell electron in subject, resulting in
absorption of the photon & creation of a photoelectron
(complete absorption)
Compton effect- Photon in X-ray beam interacts with outer shell electron in subject, resulting in partial
absorption & scattering of the photon & creation of a recoil electron
(partial absorption & scatter)
what is the direction of scatter of high and lower energy?
high energy - forward scatter
low energy- back scatter
what way do photons scatter on a radiographic image?
scattered backwards, sideways or very obliquely forwards
how do you reduce scatter ?
use of a collimater this reduces radiation does and the doses into the surroundings
UK guidance advises a suitable range of what for intra oral xray units?
60-70kV
what’s the differences between the xray processes Continuous radiation interaction and Photoelectric effect?
Continuous radiation interaction leads to the production of xray photos
and the Photoelectric effect lead to attention of xray beam.
