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Exposure vs mAs and kVp

X₂ = 6.531 mR

X2=X1mAs2mAs1(kVp2kVp1)nX_2 = X_1\cdot\frac{\mathrm{mAs}_2}{\mathrm{mAs}_1}\left(\frac{\mathrm{kVp}_2}{\mathrm{kVp}_1}\right)^n

Rule of thumb: exposure ∝ mAs × (kVp)^n.

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