moving grid

moving grid,

an x-ray grid that is continuously moved or oscillated throughout the exposure of a radiographic film.

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grid,

n a device used to prevent as much scattered radiation as possible from reaching a radiographic film during the making of a radiograph. It consists essentially of a series of narrow lead strips closely spaced on their edges and separated by spacers of low-density material.

grid, crossed,

n an arrangement of two parallel grids rotated in position at right angles to each other. See also grid, parallel.

grid, focused,

n a grid in which the lead foils are placed at an angle so that they all point toward a focus at a specified distance.

grid, moving,

n a grid that is moved continuously or oscillated throughout the making of a radiograph.

grid, parallel,

n a grid in which the lead strips are oriented parallel to each other.

grid, Potter-Bucky,

n.pr a grid using the principle of the moving grid, with an oscillating movement.

grid, stationary,

n a nonoscillating or nonmoving grid; the image of its strips will be visible on the radiograph for which it is used.