As kVp increases, the percentage of Compton interactions __________ and image contrast __________.

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Multiple Choice

As kVp increases, the percentage of Compton interactions __________ and image contrast __________.

Explanation:
As kVp goes up, photons have more energy, making Compton scattering more likely relative to photoelectric absorption. Photoelectric absorption drops off quickly with energy, while Compton scattering remains relatively more probable, so the fraction of interactions that are Compton increases with kVp. Those scattered photons create image fog and reduce the differences in how tissues absorb the beam, which lowers image contrast. So the best description is that the percentage of Compton interactions increases as kVp increases, and image contrast decreases. The other possibilities would imply either less Compton interaction with higher energy or higher contrast with more scatter, which doesn’t fit how x-ray interactions behave.

As kVp goes up, photons have more energy, making Compton scattering more likely relative to photoelectric absorption. Photoelectric absorption drops off quickly with energy, while Compton scattering remains relatively more probable, so the fraction of interactions that are Compton increases with kVp. Those scattered photons create image fog and reduce the differences in how tissues absorb the beam, which lowers image contrast.

So the best description is that the percentage of Compton interactions increases as kVp increases, and image contrast decreases. The other possibilities would imply either less Compton interaction with higher energy or higher contrast with more scatter, which doesn’t fit how x-ray interactions behave.

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