Grid Conversion Factor

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Last updated 12:42 AM on 6/4/26
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9 Terms

1
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Grid Conversion Factor (GCF) Formula

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2
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Grid Ratio: non grid

Bucky factor/GCF: 1

3
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Grid Ratio: 5:1

Bucky factor/GCF: 2

4
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Grid Ratio: 6:1

Bucky factor/GCF: 3

5
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Grid Ratio: 8:1

Bucky factor/GCF: 4

6
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Grid Ratio: 12:1

Bucky factor/GCF: 5

7
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Grid Ratio: 16:1

Bucky factor/GCF: 6

8
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A knee radiograph produced without a grid using 10 mAs. Then a repeat is taken with an 8:1 grid. What is the new mAs?

-8:1 is 4 on conversion chart

-10(4)= 40 mAs

9
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A radiograph is taken with a 16:1 grid at 60 mAs. We repeat and take away the grid. What is the new mAs?

-GCF=6

X/60=1/6

X=60(1/6)

X= 10 mAs