Grid Factor (Bucky Factor)
FormulaUsing an anti-scatter grid requires an increase in mAs to compensate for its absorption.
mAs_grid = mAs_no_grid × BF
Typical Bucky Factor (BF) values:
• Ratio 5:1 → BF ≈ 3
• Ratio 8:1 → BF ≈ 4
• Ratio 10:1 → BF ≈ 5
• Ratio 12:1 → BF ≈ 6
The mAs increase compensates for the grid's absorption while maintaining the correct optical density on the image.
Go beyond the definition
With Rad Index you study with flashcards, browse all 147 full projections and the ALARA checklist — even offline, on the ward.
