A diaphragm is placed 4 inches from the focal spot.The diameter of the opening in the aperture is a 2-inch circle.What would be the projected image size if the image receptor distance (SID) were 40 inches?
Correct Answer:
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Q26: Cones and cylinders would be commonly employed
Q27: Penumbra is _ when the beam restrictor
Q28: All of the following are considered beam-restricting
Q29: When more photons are absorbed photoelectrically, the
Q30: The diameter of the lower rim of
Q32: The shutters of a collimator
A)regulate field size.
B)reduce
Q33: The _ the atomic number of the
Q34: As the volume of irradiated tissue _,
Q35: When collimating down from a 14"x17" field
Q36: Collimators that offer positive beam limitation (PBL)
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