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Technique Equations
X-ray technique equations and uses.
| Term | Definition |
|---|---|
| 15% Rule Equation | 15% increase of the kVp and decrease the mAs by half |
| 15% Rule Use | Maintain signal to the IR but decrease patient dose |
| Direct Square Law Equation | mAs1/mAs2=(d1)2/(d2)2 |
| Direct Square Law Use | Maintain EI and SNR |
| Inverse Square Law Equation | I1/I2=(d2)2/(d1)2 |
| Inverse Square Law Use | Finding distance or intensity of the beam |
| Magnification Equation | MF=SID/SOD |
| Magnification Use | Used for finding magnification of an object. Ex. a prosthetic size |
| Grid Factor Equation | GF=mAs with grid/mAs without grid |
| Grid Factor Use | determine required mAs adjustment when changing from using a grid to without |
| Grid Conversion Equation | mAs1/mAs2 = GCf1/GCF2 |
| Grid conversion Use | determine required mAs adjustment when changing from one type of grid to another |