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Equations RADT 311
Final Review
Question | Answer |
---|---|
Find SID | SOD+OID |
Find SOD | SID-OID |
Find OID | SID-SOD |
Unsharpness | Focal Spot Size x OID / SOD |
Magnification | Image Size / Object Size = SID / SOD |
% of Magnification | Image Size - Object Size / Object Size (then multiply by 100) |
Inverse Square Law (intensity) | I1/I2 = D2 squared/D1 squared |
Maintenance Formula (Direct Square Law) | mAs1/mAs2 = D1 squared/D2 squared |
15% Rule | Increase kVp 15% cut mAs in half or Decrease kVp 15% double mAs |
Field Size | mAs1/mAs2 = Field Size1/Field Size 2 (conversions: 14x17 (1), 10x12(1.25), 8x10 (1.40) |