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Exposure 18

Grids

QuestionAnswer
criss-cross grid two linear grids placed on top of one another so that the lead strips from a criss-cross pattern
cross-hatched grid two linear grids placed on top of one another so that the lead strips form a criss-cross pattern
focused grid a grid created with the central grid strips parallel with the strips becoming more inclined as they mnove away from the central axis; the lines would intersect along a point in space called the line of convergence
grid cut-off the result of the primary beam being angled into the lead strips
grid frequency the number of grid lines per inch or centimeter
grid ratio the ratio of the height of the lead strips to the distance between the strips
linear grid a grid with lead strips running in only one direction
parallel grid a grid created with the lead and interspace strips running parallel to one another; the lines will necver intersect
a grid is employed when body part thickness exceeds 10cm; kVp is above 60
grid ration formula grid ratio=height/distanceh=lead strip height d=interspace width
grid conversion factor (GCF) GCF=mAs with the grid/mAs without the grid
converting from one grid to another formula new mAs=old mas x GCF new/GCF old
Created by: smweckler