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RT Exposure - Part I
Review items for midterm and final exam. Covers Bushong chapters 1, 2,3 &9
| Question | Answer |
|---|---|
| The SI unit for the Roengen | Gy in air |
| The unit of occupational exposure | rem or Seivert |
| divide by this to convert mR to R | 1,000 |
| The radiation quantity received by the patient | rad or radiation absorbed dose |
| When an atom loses or gain an electron | ionization |
| If you double your distance from the radiation source the amount of exposure | 1/4th the original amount |
| When doubling the distance from the radiation source you need to __ mAs to maintain density | 4 times the original mAs |
| As the kVp increases this happens to x-ray energy or speed or penetrating ability | they increase |
| As kVp increases the frequency is ____________ | shortened |
| As kVp increases the wavelength ___________ | decreases |
| Direct or Indirect relationship between mAs and x-ray quantity | direct |
| relationship between kVp and distance | direct by kVp squared |
| As filtration increases x-ray quantity _______ and why? | decreases because filtration absorbs low energy x-rays |
| kVp stands for; | kilovoltage peak |
| The "square law" is used to calculate | changes required for mAs if the distance changes |
| Higher or lower energy x-rays are more capable of penetrating patient tissue | higher |
| Higher quality x-rays are also known as ______ penetrating | More |
| The reduction in x-ray intensity that results from absorption and scattering | attenuation |
| Thickness of absorbing material to reduce x-ray intensity to half its original value | HVL or half value layer |
| Increase in HVL increases or decreases x-ray beam quality | increases |
| As filtration increases the x-ray quantity increases or decreases | decreases |
| The glass or metal enclosure of x-ray tube is called __________ filtration | inherent |
| The amount of inherent filtration is usually this amount | 0.5 mm Al equivalent |
| True or False - As the x-ray tube ages inherent filtration increases due to this | vaporization of tungsten target and filament of x-ray tube deposited on window inside |
| With the addition of filtration more low energy x-rays are ______________ | attenuated |
| The amount of added filtration | 2.0 mm Al equivalent |
| In diagnostic range the required amount of total filtration | 2.5 mm Al equivalent |
| This type of filter is used to achieve an image with uniform density when body part varies in thickness | compensating filter |
| A trough, "bow-tie", wedge or conic are types of this | compensating filter |
| The number of HVL's needed to reduce x-ray beam intensity to less than 6% of original amount | 5 ( key is less than not equal to) |
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fleury21
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