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