Beam Restriction Study Sheet
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is the best way(s) to reduce the amount of scatter reaching the film? | By restricting the x-ray beam and by using a grid.
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| What 2 factors affect the amount of scatter radiation produced? | kVp and irradiated material (patient thickness)
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| Name the 4 types of beam restrictors. | Aperture diaphragm, cones, cylinders, and collimators (ACCC)
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| What is another name for automatic collimators? | Positive beam limitation devices (PBL)
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| X-ray beam and light should coincide within ___ of SID. | 2%
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| The principal factors that affect the amount of scatter produced are? | Kilovotage and the irradiated material
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| As kilovotage increase, the percentage of x-rays that undergo a Compton interaction __________ and the percentage of photons that undergo photoelectric absorption _________. | Increases, decreases
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| The total number of photons that undergo interaction __________ with increased kVp. | Decreases
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| When the beam is restricted, _______ scatter radiation will reach the IR, and as a result, technical factors may need to be ________. | Less, increased
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| Cones and cylinders are most commonly employed in radiography of the ________, _______, ___________, and ____________. | Skull, spine, gallbladder, breast
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| _________ _________ ____________ devices are automatic collimators that use sensing devices to activate collimator shutters into proper position. | Positive beam limitation
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| Higher atomic number materials attenuate a ________ percentage of the beam than low atomic number materials. | Greater
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| __________ is the quantity of matter per unit of volume measured in kilograms per cubic meter. | Density
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| ________ __________ is the degree of differential absorption resulting from the differing absorption characteristics of the tissues in the body. | Subject contrast
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