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23 Cards in this Set

  • Front
  • Back
Compton interactions, photoelectric absorption and transmitted x rays contribute to ______
differential absorption
attenuation is caused by _____ and ______.
absorption and scattering
Barium is a good contrast agent because of its_______
high atomic number (has more electrons)
K shell binding energy increases with increasing ____
atomic number
Only at energies at 10 MeV can this nuclear event ______ take place
photodisintegration
2 primary forms of x-rays interaction in the diagnostic range are _______.
Comptons scatter & photoelectric absorption
An incident x-ray interacts with an atom without ionization during _______.
Coherent scattering
An outer-shell electron is ejected and the atom is ionized during ______.
Compton interactions
Which x-ray interaction involves the ejection of the K-shell electron?
Photoelectric absorption
The scattered x-ray from a Compton interaction usually retains ______ of the energy of the incident photon
most
Compton scatter is directed at ______ angle from the incident beam
any
As kVp _______, the probability of photoelectric absorption _______.
is reduced, increases
In ________, there is complete absorption of the incident x-ray photon
photoelectric interaction
occurs only at the very high energies used in radiation therapy and in nuclear medicine P.E.T. imaging.
pair production
Only at energies above 10 MeV can ______ take place.
photodisintegration
When the mass density of the absorber is _____, it results in _____ Compton scatter
increased, increased
Which has the greatest mass density?
bone
Because of differential absorption, about ____________% of the incident beam from the x-ray tube contributes to the finished image.
.5%
Barium is a good contrast agent because of its ________.
high atomic number
A negative contrast agent is ______.
air
x-rays transmitted without interaction contributes to ______.
radiographic image
High kVp technique reduce_______.
patient dose
At energies below 40 KeV, the predominant x-ray interaction in soft tissue and bone is ________.
photoelectric absorption