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Chap 7 x-ray prod.

Imaging1.

QuestionAnswer
Incident electrons Electrons that form the thermionic cloud that travel to the anode.
Define target interactions When incident electrons strike the target (anode), they transfer kinetic energy to the target material, producing x-ray photons.
What are the two target interactions? Bremsstrahlung and characteristic interactions.
What is the approximate % of electron energy the is converted to x-ray photon energy? Less than 1%
Brems interactions may occur only when... the incident electron interacts with the force field of the nucleus.
Describe how a Brems interaction occurs. when the incident electron interacts with the force field of the nucleus, this causes the incident electron to slow down/brake and diverts the electrons course. The energy that is lost is an x-ray photon.
Bremsstrahlung photons' energy is exactly the difference between... The entering and exiting kinetic energy of the electron.
Characteristic interactions may occur only when…. the incident electron interacts with an inner-shell electron.
Describe how a Characteristic interaction occurs. when the incident electron interacts with an inner-shell electron, knocking it out of orbit an electron from an outer shell fills the electron “hole”, and the difference in energy between those two shells is emitted as an x-ray photon.
Characteristic photons' energy is exactly the difference between... the binding energy of the outer and inner shells between which the electron dropped.
Characteristic Cascade? An outer shell electron filling the "hole", a further outer shell electron fills that "hole", etc until only the outermost shell is missing an electron.
How many x-ray photons can the characteristic cascade produce? Numerous photons can be produced for each electron that leaves the atom.
Only electron drops into the __ shell will produce characteristic photons within the diagnostic x-ray range. K-shell. (the others have energies too low)
Within diagnostic x-ray range, most photons are produced by _______? Bremsstrahlung target interactions.
What is a kilovoltage peak of an exposure? kVp of an exposure is the maximum possible energy for any photon that exits the x-ray tube.
The average keV of the primary beam as compared to the kilovoltage peak is what percent of the kVp? keV energy is only 30-40% of the kVp.
Created by: Zoest35
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