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reduce scatter from getting to the IR, series of lead strips and radiolucent interspace material can absord 80-90 % of scatter
HOW A GRID WORKS
designed to transmit xrays in the direction of a straight line, scatter does not travel straight, are absorbed by the grid
COMMON GRID RATIOS
8:1, 10:1, 12:1 common in general xray
higher the grid ratio, more clean up of scatter, increases pt dose
CONTRAST IMPROVEMENT FACTOR
ratio of radiographic contrast with a grid to that without a grid
formula k= image contrast with a grid
image contrast without a grid
using a grid requires increase in technique
higher grid ratio--higher BF
BF increases with increasing kVp
COMMON BUCKY FACTORS
non grid..........1 8:1...............4
3:1, 4:1...........2 10:1..............5
5:1, 6:1...........3 12:1, 16:1.......6
ratio of primary radiation to scatter radiation transmitted through the grid. lead content the primary influence
has strips that run parallel with long axis and short axs, centering is critical, cleans up a lot of scatter
OFF LEVEL GRID
grid must be per to CR, usually occurs from improperly positioned tubes, may occur when grid tilts during portables. If Cr is anglled grid cutoff will occur across the entire film
OFF FOCUS GRID
at the wrong focal distance, the farther the distance,the worse the cuttoff. Cut off is more severe toward edges of film. This is more important with high grid ratios
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