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Q 1/187
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All of the following are related except one. Select the choice that is NOT RELATED.
Q 2/187
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a source of electrons
187 questions
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thermionic emission
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a thermionic cloud.
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stator.
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copper.
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high melting points.
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all of the above
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under the cathode end of the tube.
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100 mR/hr measured at 1 meter.
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an x-ray tube rating chart is checked prior to exposure.
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absorption.
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rotate the anode.
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anode heel
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increases.
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12
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length of the filament.
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when a cold anode is hit with a high kVp exposure.
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with extended use.
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space charge effect.
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anode.
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k-edge production of characteristic radiation, to match soft tissues of the breast.
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excellent k-edge value for x-ray production
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incident electrons.
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an inner-shell electron.
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the force field around the nucleus.
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the difference between the entering and exiting kinetic energies of the incoming electron.
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heat.
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greater than that
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an inner-shell electron.
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low-energy x-ray photons
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1 percent
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Heat
147
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An incident electron interacts with the force field of the nucleus, causing the incident electron to slow down, thus diverting the electron's course.
148
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The incident electrons interact with an inner-shell electron, knocking out the inner-shell electron and continuing in a slightly different direction, which creates a hole in the inner-shell, making the shell unstable
149
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The reaction of electrons dropping into the holes created during a characteristic interaction until there is only a hole in the outer shell
150
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The average primary beam photon has a keV energy of only about 30-40 percent of the kVp
151
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When mAs is changed, it results in the amplitude of the emission spectrum graph. When kVp is changed, it results in a change in the number of higher-energy photons, as well as in the amplitude
152
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The process of attenuating and hardening an x-ray beam, is traditionally quantified in units of mm Al (aluminum) or the thickness of an aluminum filter that would have the same effect on the beam.
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Aluminum is the standard filtering material and all filtration can be expressed in terms of the thickness of aluminum equivalency (Al/Eq)
154
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The half-value layer (HVL) is that amount of absorbing material that will reduce the intensity of the primary beam to one-half its original value.
155
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Inherent filtration is the composition of the tube and its housing.
156
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Most compound filters are constructed so that each layer absorbs the characteristic photons created by the previous layer. Compound filters place the highest-atomic-number material closest to the tube and the lowest-atomic-number material closest to the patient.
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The two most common compensating filters are the wedge filter and the trough filter.
158
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Total filtration is equal to the sum of inherent and added filtration and does not include any compound or compensating filters that may be added later.
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Filtration reduces the patient exposure dose by eliminating low-energy photons from the primary x-ray beam,it also removes a portion of the useful beam.
