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Physics
Ch. 7 and 8
| Question | Answer |
|---|---|
| Image contrast is affected by | beam quality and kVp |
| An increase in kVp would ____ the _____ of the emission spectrum | increase; amplitude and position |
| The HVL of an x-ray beam is a measurement of beam | energy |
| An increase in mAs would ____ the ______ of the emission spectrum | increase; amplitude alone |
| Beam energy is affected by | kVp and filtration |
| The ____ of an x-ray beam is higher when the peak of the emission spectrum is further to the ____ | quality; right |
| An exposure taken at 100 kVp would have a continuous emission spectrum with a maximum energy of _____ keV | 100 |
| A low-quality beam would also have low _____ | penetrability |
| An x-ray beam that could pass through dense tissue would have high ___ | penetrability and quality |
| The quantity of bremss radiation increases proportionately with increased | mAs |
| The penetrability of an x-ray beam is called x-ray | quality (controlled by kVp) |
| Characteristic x-rays are produced by | released binding energy |
| X-ray intensity is proportional to | kVp2 |
| Bremss x-rays are produced by _____ at the target | slowing electrons |
| If an exposure is 0.5 mGy at an SID of 40, what would the exposure be at an SID of 60 | 0.222 mGy |
| At 55 kVp, _____ of the x-rays produced are bremss | 100% |
| Most of the x-rays produced at the target are | bremss |
| If the intensity of a 70 kVp exposure at 20 mAs is 1.0 mGy, what would it be at 5mAs | 0.25 mGy |
| Characteristic K-shell x-rays have an effective energy of ____ keV | 69.5 |
| An increase of 15% in kVp is equivalent to increasing mAs | 100% |
| The useful characteristic x-rays from tungsten targets are ___-shell x-rays | K |
| The inverse square law has the same effect on x-ray ____ and x-ray ____ | intensity;exposure |
| If a technologist changes the technique from 70 kVp @ 200 mAs to 70 kVp @ 400 mAs, the x-ray intensity will | double |
| Electron interactions at the inner shell of the target atoms produce ____ radiatio | characteristic |
| If the quantity of electrons hitting the target is doubled, the x-ray intensity is | increased by a factor of 2 |
| Approximately ____ of the kinetic energy of the projectile electrons is converted to x-rays at the target | 1% |
| A 10% increase in kVp has ___ effect on x-ray intensity than/as a 10% increase in mAs | much greater |
| The efficiency of x-ray production increases as ____ increases | kVp |
| If filter thickness is _____ then x-ray intensity is ____ | increased; reduced reduced; increased |
| The production of heat at the anode is directly proportional to | tube current |
| Most of the heat generated at the target is due to | outer-shell excitation |
| The efficiency of x-ray production is ____ the tube current | not affected by |
| At the target, the projectile electrons interact with | inner-shell and outer-shell electrons |
| During an exposure, most of the ____ energy of the projectile electrons is converted to ____ | kinetic; heat |
| Projectile electrons travel from | cathode to anode |
| If the SID is reduced by half, how is the x-ray intensity at the image affected | increased 4 times |
| X-ray intensity increases in direct proportion to increases in | mAs |
| The number of x-rays in the useful beam defines x-ray | intensity (same as quantity) |
| Grays, or milligrays, in air are the measurement for x-ray | quantity, exposure, and intensity |
Created by:
deniseday21
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