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air gap technique
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aperture diaphragm
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Scatter Control

Chapter 12: Scatter Control

TermDefinition
air gap technique Method for limiting the scatter reaching the IR. Scatter will miss the IR if there is increased distance between the patient and IR
aperture diaphragm Simplest type of beam-restricting device, constructed of a flat piece of lead that has a hole in it
automatic collimator Automatically limits the size and shape of a primary beam to the size and shape of the IR. Also called a positive beam-limiting device
beam-restricting device Changes the shape and size of the primary beam; located just below the x-ray tube housing
beam restriction Refers to a decrease in the size of the projected radiation field, also known as collimation
Bucky The Potter-Bucky diaphragm located directly below the radiographic tabletop, which contains the grid and holds the IR
Bucky factor Can be used to determine the adjustment in milliampere/second needed when changing from using a grid to non-grid (or vice versa) or for changing to grids with different grid ratios; also called the grid-conversion factor (GCF)
collimation Refers to a decrease in the size of the projected radiation field, also known as beam restriction
collimator Located immediately below the tube window where the entrance shutters limit the x-ray beam field size
cone Essentially an aperture diaphragm that has an extended flange attached
convergent line An imaginary line if points were connected along the length of a linear focused grid
convergent point An imaginary point, if imaginary lines were drawn from each of the lead lines in a linear focused grid
cross-hatched grid Has lead lines that run at a right angle to one another
crossed grid Has lead lines that run at a right angle to one another
cylinder Essentially an aperture diaphragm that has an extended flange attached to it
focal distance The distance between the grid and the convergent line or point. Also known as the grid radius
focal range The recommended range of SID measurements that can be used with a focused grid
focused grid Has lead lines that are angled, or canted, to approximately match the angle of divergence of the primary beam
grid A device that has very thin lead strips with radiolucent interspaces; intended to absorb scatter radiation emitted from the patient before it strikes the IR
grid cap Contains a permanently mounted grid and allows the IR to slide in behind it
grid cassette An IR that has a grid permanently mounted to its front surface
grid conversion factor (GCF) Can be used to determine the adjustment in milliampere/second needed when changing from using a grid to a non-grid (or vice versa) or for changing to grids with different grid ratios; also called the Bucky factor
grid cutoff A decrease in the number of transmitted photons that reach the IR because of some misalignment of the grid
grid focus The orientation of a grid's lead lines to one another
grid frequency Expresses the number of lead lines per unit length in inches, centimeters, or both
grid pattern Refers to the linear pattern of the lead lines of a grid
grid ratio The ratio of the height of the lead strips to the distance between them
interspace material Radiolucent strips between the lead lines of a grid, generally made of aluminum
lead mask Changes the shape and size of the projected x-ray field; similar to an aperture diaphragm
linear grid Has lead lines that run in one direction only
Moiré effect A zebra pattern artifact that can occur during CR imaging if the grid frequency is similar to the laser scanning frequency or if a grid cassette is placed in a Bucky
nonfocused grid Has lead lines that run parallel to one another; also called a parallel grid
parallel grid Has lead lines that run parallel to one another; also called a nonfocused grid
positive beam-limiting device (PBL) Automatically limits the size and shape of the primary beam to the size and shape of the IR; also called an automatic collimator
wafer grid A stationary grid placed on top of the IR
Created by: setelinea
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