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