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H C Grids

are used to control scatter radiation Grids
tools to decrease scatter The grid, lower kVp ,Decreasing the field size, Decreasing the body part thickness
Grid was developed by Gustav Bucky in 1913
When you use a grid you ______ the dose to the patient which will _______the mAs increase increase
The grid only allows x-rays through that are traveling in straight lines
Grids clean up scatter radiation
Grids consist of carefully fabricated sections of radiopaque material (grid lines) alternating with sections of radiolucent material (interspace material)
Grid ratio height of the grid/width of the interspace material
Moving grids aka reciprocating aka oscillating grids
clean up scatter radiation better High ratio grids
GRID FREQUENCY Usually 60-110 lines per inch
Grids with high frequency show less distinct grid lines
High frequency grids usually will also have a higher grid ratio
The grid lines are made of lead
The interspace material is made of aluminum or plastic
Both the front and back covers of the grid are usually made of aluminum
60-80 grid lines per inch will have to be shaken
Most grids have an improvement factor of between 1.5 and 2.5
many shades of gray low contrast
black and white high contrast
CONTRAST IMPROVEMENT FACTOR K = Radiographic contrast with a grid/ Radiographic contrast without a grid
the amount of increase in radiographic technique needed because a Bucky is being used BUCKY FACTOR
As the Bucky factor increases the radiographic technique and patient dose increases
BUCKY FACTOR = Patient dose with a grid/ Patient dose without a grid
Parallel grid all the lead strips are parallel to each other
developed by Hollis Potter Moving grid
more difficult to manufacture than parallel grids but there is no grid cutoff Focused grid
this is the type used most focused grid
Grid Cut Off the grid line absorb to much photons because of the distance of the tube it to far or to close and causes cut off on the film
problems that cause grid cut off Off level grid, Off center grid, Off focus grid ,Upside down grid
is due to the grid being backwards and the film is very dark center and light sides upside down grid
AIR GAP TECHNIQUE does not use a grid
A gap between the body part and the film AIR GAP TECHNIQUE
Improves image contrast Air Gap Technique
Put grid lines crosswise and lengthwise Crossed grid
Created by: hakrrins