Chapter 15 - Beam Restriction
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| What are the two principal factors that affect the amount of scatter produced? | kilovoltage and irradiated material
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| How does the atomic number of a material affect the amount of scatter produced? | Higher atomic number materials= a greater number of electrons within each atom, which means photons have a greater chance of striking an electron and interacting with these materials, creating more scatter
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| Collimators with automatic controls are called? | Positive Beam limitation (PBL)
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| What happens to the transmisssion of photons when kVp is increased with no other change in the technical factors for an exposure? | increases transmission
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| What happens to the amount of scatter created in an increase in kVp is combined with a reduction in mAs? | it decreases scatter
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| The mounting mirror that supplies the light field in the collimator is placed at a ______ angle. 1. 30 2. 40 3. 45 4. 50 | c. 45 degree
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| The beam is automatically collilmated to the size of the image receptor using what? | Positive beam limitation (PBL)
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| What is the simplest of all beam restrictors? a. cones b. aperture diaphragm c. cylinders d. collimator | b. aperture diaphragm
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| What is the geometric unsharpness around the edge of an image known as? | Penumbra
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| What happens to scatter radiation if the amount of irradiated tissue increases? | increases scatter radiation
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| What factor(s) that has/have an effect on the amount of scatter generated is/are under the direct control of the radiographer? a. atomic number b. medical condition c. patient size d. field size and kVp | d. field size and kVp
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| A set of lead shutters at right angles to one another that move in opposing pairs | collimator
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| Exposure Factors Chapter 15 - Beam Restriction |
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