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imaging 1 chapter 11
radiology technology- imaging 1 chapter 11
| Question | Answer |
|---|---|
| what is the relationship between distance and density/ IR exposure? | x-ray intensity will decrease as the distance from the tube increases |
| what is the relationship between mAs and density? | exposure is directly proportional to mAs mAs is used as the primary controller of radiographic film density and image receptor exposure |
| what is penetrability | the ability of a cute current (mA) and exposure time (s) |
| what 2 things affect quality? | kVp and filtration |
| what is the reciprocity law | the density should remain unchanged as long as the intensity and duration of the x-ray exposure remains unchanged |
| density is a direct result of... | an exposure to the film and intensifying screen |
| what is x-ray quality | measurement of penetrating ability of the x-ray beam |
| what is the inverse square law? | the intensity of radiation as given distance from a point of source is inversely proportional to the square of the distance |
| what is the direct square law | a direct relationship is necessary to compensate for the changes in intensity and film density |
| what can be changed or adjusted to compensate for the changes in distance | mAs |
| an increase in ___ will increase the speed and energy of the electrons across the x-ray tube | kVp |
| as x-ray photon energy increases the penetrating ability of the photon | increases |
| what is the 15% rule | an increase in kVp by 15% will cause a doubling in density/ exposure |
| the intensity of x-rays will _____ as the distance from the tube _____ | decrease increase |
| what 2 things does the kVp determine? | size of the object amount of contrast needed |
| 3 prime factors that affect the x-ray beam that are under a radiology technologist control are | mAs kVp distance |
| what is Roentgen (R) | unit of measurement |
| what 4 things affect the quantity | kVp mAs distance filtration |
| what is the primary controller of quality | mAs |
| if the mAs increases, the x-ray exposure increases the density.... | also increases |
| any combination of mA and exposure time will create the same | density |
| how is density measured? | densitometer |
| what is the x-ray quantity | measures the # of x-ray photons in the useful beam AKA x-ray output, intensity, exposure |
| what is mAs | measurement of x-ray tube current |
| what is half value layer (HLV) | thickness of the absorbing material needed to reduce the x-ray quality to one half if its original value |
| what is density? | how dark the film is |
| what is ampere | equal to an electric charge |
| how do you find "mA" | mAa / time |
| how do you find "time" | mAs / mA |
| how do you find the mAs | mA * time |
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