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PRI Formulas
PRI Summary of Mathematical Application
Question | Answer |
---|---|
Calulating mAs | mAs = mA x sec |
15% Rule to increase density | kVp x 1.15 |
15% Rule to decrease density | kVp x .85 |
15% Rule to maintain density when increasing kVp by 15% | mAs/2 |
15% Rule to maintain density when decreasing kVp by 15% | mAs x 2 |
Inverse Square Law Formula | I1/I2 = (D2)^2/(D1)^2 |
Density Maintenance Formula | mAs1/mAs2 = (SID1)^2/(SID2)^2 |
Inverse square law | The intensity of the x-ray beam is inversely proportional to the square of the distance from the source |