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