Scatter Control Word Scramble
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| Term | Definition |
| 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 |
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