Chapter 12 - Prime factors
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| What are the three prime factors that affect x-ray emission? | milliamperage-second (mAs), kilovoltage (kVp), and distance (d)
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| The unit of measurement for x-ray quantity? | the roentgen (R)
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| Equal to an electric charge of one Coulumb flowing through a conductor per second | an ampere
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| What is the relationship between mAs and IR exposure? | As mAs increases, x-ray exposure to the image receptor increases porportionally.
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| What effect does increased kVp have on the speed and energy of the electrons in the x-ray tube? | increasing kilovoltage will cause an increase in the speed and energy of the electrons across the x-ray tube. The more quickly the electrons move across the cathode to anode, more electrons reach the target per second, resulting in an increase x-rays.
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| The intensity of radiation at a given distance from the point source is inversely proportional to the square of the distance | inverse square law
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| X-ray exposure is inversely proportional to the square of the distance. As a result, if distance is increased, image receptor exposure will ______. | decrease
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| What is the measurement of the penetrating ability of the x-ray beam? | x-ray quality
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| What is the product of the tube current and exposure time? | milliamperage-second (mAs)
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| What kilovoltage (kVp) is needed to double the exposure of a femur at 15 mAs at 60kVp? | Increased by 15%
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| What would the kilovoltage (kVp) be to double the exposure of a femur at 15 mAs at 60 kVp? | 69 kVp
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| What is considered to be the main controller of radiographic film density? | mAs
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| A direct relationship is necessary to compensate for the changes in intensity and film density | direct square law
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| A direct square law; mAs must increase when distance increases, and vice verse, in order to maintain image receptor exposure | exposure maintenance formula
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| The ability of the x-ray to pass through structures and tissues. | penetrability
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| Factors related to x-ray emission that are under the direct control of the radiographer; milliamperage, kilovoltage, and distance. | prime factors
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| A measurement of the penetrating ability of the x-ray beam | x-ray quality (kVp)
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| A measure of the number of x-ray photons in the useful beam | x-ray quantity (mAs)
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| Exposure Factors Chapter 12 - Prime Factors |
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