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What are the two principal factors that affect the amount of scatter produced?
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How does the atomic number of a material affect the amount of scatter produced?
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Exposure Factors

Chapter 15 - Beam Restriction

QuestionAnswer
What are the two principal factors that affect the amount of scatter produced? kilovoltage and irradiated material
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
Collimators with automatic controls are called? Positive Beam limitation (PBL)
What happens to the transmisssion of photons when kVp is increased with no other change in the technical factors for an exposure? increases transmission
What happens to the amount of scatter created in an increase in kVp is combined with a reduction in mAs? it decreases scatter
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
The beam is automatically collilmated to the size of the image receptor using what? Positive beam limitation (PBL)
What is the simplest of all beam restrictors? a. cones b. aperture diaphragm c. cylinders d. collimator b. aperture diaphragm
What is the geometric unsharpness around the edge of an image known as? Penumbra
What happens to scatter radiation if the amount of irradiated tissue increases? increases scatter radiation
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
A set of lead shutters at right angles to one another that move in opposing pairs collimator
Exposure Factors Chapter 15 - Beam Restriction
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