Increasing kVp With Constant Detector Exposure Lowers Patient Dose

Increasing tube voltage (kVp) reduces patient dose when detector exposure is held constant. Higher energy photons penetrate better, so mAs can be lowered, reducing total photon output despite each photon carrying more energy.

• Higher kVp increases photon energy and penetrating power, so more photons reach the detector.
• To maintain the same detector exposure, mAs is reduced, decreasing the total number of photons produced.
• The net effect is lower patient dose, as the reduction in photon quantity outweighs the increased per-photon energy.

Automated summary

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