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If a grid is made to match the size of a 14 x 17 inch image receptor, the surface of the grid that measures 14 x 17 is called the face of the grid. A line, called the center line, is usually drawn on the face of the grid, which lets the radiographer know the direction of the grid lines, since they are hidden by the grid’s cover.
off-center grid cutoff. what type of grid cutoff occurs when the central ray is not aligned from side to side with the center of a focused grid. off-focused grid cutoff. what type of grid cutoff could occur if the radiographer mistakenly used a 72" SID for a grid with a focal range of 30"-50" SID.
Grids are chiefly characterized by the grid ratio, grid frequency, and focal distance. The grid ratio is a measure of the height of the lead strip to the interspace distance, and is a good measure of the selectivity of primary to scatter transmission.
Oct 23, 2018 · X-ray grids are presently constructed with lead strips to absorb scatter radiation and an interspacer (most commonly aluminum) to allow the primary radiation to pass to the film or receptor.
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On the basis of not deviating from the center line of the X-ray grid, the X-ray center line can be inclined at a certain angle according to the inclination direction of the lead rod, so that the X-ray radiation direction is consistent with the lead.
Sep 21, 2022 · X-ray grids are devices used in radiography to improve the quality of images by reducing the amount of scattered radiation that reaches the X-ray detector or film. The basic purpose of X-ray grid use is to enhance the contrast and quality of the medial image by removing the scatter radiation.
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The photons in the center of the beam would be perpendicular to the body. The photon in the exact center of the beam is called the central ray. See Figure 8-6. The angle of the x-ray beam is always measured at the central ray rather than at the edges of the beam.
