If the kV is increased by 10, what should happen to the mAs?

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Prepare for the VetSkill Level 3 Diploma VN02 – Diagnostic Principles Test. Engage with multiple-choice questions, hints, and explanations. Achieve your certification!

Multiple Choice

If the kV is increased by 10, what should happen to the mAs?

Explanation:
Raising the kilovoltage makes the X-ray beam more penetrating, so for the same mAs more photons reach the detector and the image receptor exposure tends to increase. To keep the exposure similar, you reduce the number of photons produced, which is done by lowering the mAs. A common practical rule of thumb is that about a 15% increase in kVp can double receptor exposure if mAs stays the same, so you offset that by roughly halving the mAs. Therefore, increasing kV by 10 is approached with a substantial reduction in mAs, often around half, to maintain similar image receptor exposure. The exact amount can vary with patient size and filtration, but halving the mAs is the standard adjustment to keep exposure consistent when kVp is increased.

Raising the kilovoltage makes the X-ray beam more penetrating, so for the same mAs more photons reach the detector and the image receptor exposure tends to increase. To keep the exposure similar, you reduce the number of photons produced, which is done by lowering the mAs. A common practical rule of thumb is that about a 15% increase in kVp can double receptor exposure if mAs stays the same, so you offset that by roughly halving the mAs. Therefore, increasing kV by 10 is approached with a substantial reduction in mAs, often around half, to maintain similar image receptor exposure. The exact amount can vary with patient size and filtration, but halving the mAs is the standard adjustment to keep exposure consistent when kVp is increased.

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