How does increasing kilovoltage peak (kVp) affect the proportion of photoelectric absorption events that occur in the patient's tissues?

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Multiple Choice

How does increasing kilovoltage peak (kVp) affect the proportion of photoelectric absorption events that occur in the patient's tissues?

Explanation:
Increasing kVp raises the average energy of the photons, and the probability of photoelectric absorption drops rapidly with energy (roughly as 1/E^3). As photons become more energetic, Compton scattering becomes the dominant interaction in tissues, so the share of events that are photoelectric absorption decreases. Pair production is negligible at diagnostic energies, so it doesn’t influence this proportion in typical radiography.

Increasing kVp raises the average energy of the photons, and the probability of photoelectric absorption drops rapidly with energy (roughly as 1/E^3). As photons become more energetic, Compton scattering becomes the dominant interaction in tissues, so the share of events that are photoelectric absorption decreases. Pair production is negligible at diagnostic energies, so it doesn’t influence this proportion in typical radiography.

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