X-Ray Interactions

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Compton scattering

Ei = Es + Eb + Eke

Barium is a good contrast agent because of its ____.

High atomic number

Which atomic shell possesses the highest binding energy?

K

K-shell binding energy = 0.53 keV

oxygen

High kVp techniques reduce _____.

patient dose

At energies below 40 keV, the predominant x-ray interaction in soft tissue and bone is _____.

photoelectric absorption

When an x-ray photon with a slightly greater energy than the binding energy of the inner-shell electron interacts with that inner-shell electron, the following interaction results:

photoelectric absorption

Which x-ray interaction involves the ejection of the K-shell electron?

photoelectric absorption

In ____, there is complete absorption of the incident x-ray photon.

photoelectric interaction

product of pair production

positron

The electron dislodged during Compton scattering is called the

recoil electron.

When x-ray photons interact with matter and change direction, the process is called

scatter

X-rays transmitted without interaction contribute to _____.

the radiographic image

photoelectric effect

total absorption

The scattered x-ray from a Compton interaction usually retains _____ of the energy of the incident photon.

most

_____ occurs only at the very high energies used in radiation therapy and in nuclear medicine P.E.T. imaging.

Pair production

Differential absorption is dependent on (the) _____.

kVp of the exposure atomic number of the absorber mass density of the absorber

Compton scatter is directed at _____ angle from the incident beam.

any

K-shell binding energy increases with increasing ____.

atomic number

yield photons with each transition

characteristic cascade

An incident x-ray interacts with an atom without ionization during _____.

coherent scattering

no loss in energy

coherent scattering

An outer-shell electron is ejected and the atom is ionized during _____.

compton interactions

The two primary forms of x-ray interaction in the diagnostic range are _____.

compton scattering and photoelectric absorption

As the angle of deflection is increased from 0° to 180°,

greater energy is imparted to the recoil electron.

As kVp ____, the probabilities of photoelectric absorption ____.

increases, decreases

When the mass density of the absorber is _____, it results in _____ Compton scatter.

increases, increases


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