An exposure at 70 kVp and 10 mAs produces a beam intensity of 341 microgray. Calculate Gy/mAs.

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Multiple Choice

An exposure at 70 kVp and 10 mAs produces a beam intensity of 341 microgray. Calculate Gy/mAs.

Explanation:
Dose per unit mAs is found by dividing the delivered dose by the mAs used. Here, 341 microgray is the dose at 10 mAs, which is 0.000341 Gy. Divide by 10 mAs to get Gy per mAs: 0.000341 Gy / 10 = 0.0000341 Gy/mAs, i.e., 3.41 × 10^-5 Gy/mAs. So the correct Gy per mAs is 3.41 × 10^-5 Gy/mAs. (Note: this value doesn’t match the listed options, suggesting a possible misprint in the choices.)

Dose per unit mAs is found by dividing the delivered dose by the mAs used. Here, 341 microgray is the dose at 10 mAs, which is 0.000341 Gy. Divide by 10 mAs to get Gy per mAs: 0.000341 Gy / 10 = 0.0000341 Gy/mAs, i.e., 3.41 × 10^-5 Gy/mAs. So the correct Gy per mAs is 3.41 × 10^-5 Gy/mAs. (Note: this value doesn’t match the listed options, suggesting a possible misprint in the choices.)

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