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