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# Formulas

### Imaging 2

Inverse square law MR1 over MR2 = D2(squared) over D1 (squared). (up, down)
Direct square law i1 over i2 = SID1(squared) over SID2(squared). (up, up) i=mAs
Grid conversions 0=1, 5:1=2, 6:1=3, 8:1=4, 10:1=5, 16:1=6
Grid conversion formula mAs1 over mAs2 = GCF1 over GCF2. (up, up)
Relative/screen speed mAs1 over mAs2 = RS2 over RS1. (up, down)
*Relative speed* High speed has ____ crystals, so ____ mAs is needed than with slow speeds. more crystals, less mAs. (has less detail though)
Magnification MF= SID/SOD
SID= ____ + _____ SOD + OID
kVp... 15% increase? Decrease mAs by 50% or 1/2
kVp.... 15% decrease? Increase mAs by 100% or 2
Created by: Zoest35