![]() ![]() GRID FREQUENCY# OF LEAD STRIPS PER INCH OR CM G.F. NO GRID 5:1 8:1 12:1 16:1 1 X MAS, KVP X 1 2 X MAS, + 8-10 KVP 4 X MAS, + 12-15 KVP 5 X MAS, + 20-25 KVP 6 X MAS, + 30-40 KVP GRID CONVERSIONS NEW MAS= ORIGINAL MAS X NEW GRID FACTOR/OLD FACTOR RATIO SCATTER CLEAN-UP GRID RATIO VS CLEANUP HIGH QUALITY GRIDS CAN ATTENUATE 80%-90% OF SCATTER RADIATION GRID SURFACE X-RAY ABSORPTION-TYPICAL GRID STRIPS-50 MICROMETERSINTERSPACE –350 MICROMETERS X-RAY ABSORPTION (%)= WIDTH OF STRIPS X 100 WIDTH OF STRIPS + WIDTH OF INTERSPACE To visually distinguish between the various tissue types in an image, it is the primary X-ray that provides the essential. However, the presence of a grid means the patient dose subsequently increases. SCATTER RADIATION-PRODUCED WITHIN THE PATIENT THROUGH _INTERATION CAMPTON An anti-scatter grid is often used in X-ray radiography to reduce the scattered X-rays generated from the patient.
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