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Bushong Ch 7&8
Xray Production & Xray Emission
| Question | Answer |
|---|---|
| Projectile electrons must travel from | cathode to anode |
| At 100 kVp, approximately _____% of the x-ray beam is characteristic | 15 |
| During an exposure most of the ________ energy of the projectile electrons is converted to ________. | kinetic, heat |
| At the target, the projectile electrons interact with | outer shell electrons and inner shell electrons |
| The efficiency of x-ray production is ______ the tube current | not affected by |
| Most of the heat generated at the target is due to | outer-shell excitation |
| The production of heat at the anode is directly proportional to | tube current |
| The efficiency of x-ray production increases as _______ increases. | kVp |
| Approximately ____ of the kinetic energy of the projectile electrons is converted to x-rays at the target | 1% |
| Interactions which result in the removal and replacement of a K-shell electron, produce ______ radiation | characteristic |
| Most of the x-rays produced at the target are _______. | brems |
| Bremsstrahlung x-rays are produced by ________ at the target. | slowing electrons |
| Characteristic x-rays are produced by | released binding energy |
| A bremsstrahlung x-ray is emitted | from the conversion of kinetic energy |
| An exposure taken at 100 kVp would have a continuous emission spectrum with a maximum energy of ______ keV. | 100 |
| The ______ of an x-ray beam is higher when the peak of the emission spectrum is further to the ______. | quality, right |
| An increase in mAs would ______ the ______ of the emission spectrum | increase, amplitude only |
| An increase in kVp would ______ the _______ of the emission spectrum. | increase, amplitude and position |
| Changes in _______ result in directly proportional changes in the amplitude of the emission spectrum. | mA and time |
| The discrete portion of the x-ray emission spectrum would change position with a change in ________. | target material |
| The amplitude of the emission spectrum is _____ with a ______ generator than/as with a single-phase generator. | higher, 3-phase |
| A 15% increase in kVp is equivalent to | doubling the mAs |
| How does added filtration affect the emission spectrum? | reduced amplitude and a shift to the right |
| If an N shell electron fills a K shell vacancy, what is the energy of the photon produced? | 68.9 kEv |
| An electron from which shell, is most likely to fill an L shell vacancy? | M shell |
| If a filament electron enters an atom with 100 keV, passes the nucleus and exits with no kinetic energy, what is produced? | 100 kEv brems |
| What is the average energy of a beam produced at 90 kVp? | 30 kEv |
| What factors affects the size and position of the x-ray emission spectrum? | tube current, tube voltage, and target material |
| The reduction in x-ray energy which results from absorption and scattering is called: | attenuation |
| The best method for specifying x-ray quality and is defined as the thickness of the absorbing material necessary to reduce the x-ray intensity to half of its original value: | half value layer |
| What affects xray quality | kVp and filtration |
| What affects xray quantity | mAs,, kVp, filtration, distance |
| A compensating filter is used to create a uniform intensity with reference to a part which is not uniform in thickness | true |
| A compensating filter is used to compensate for differences in subject radiopacity | true |
Created by:
lkdickson
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