The intensity of the x-ray beam is inversely proportional to the square of the distance from the source

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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