What aspect of the primary x-ray beam does kVp control? What is the effect of increasing kVp on the resulting image in terms of blackening and contrast?
kVp determines the energy the x-ray photons have when they leave the x-ray tube. The greater the energy the greater thickness of tissue x-ray photons can pass through. Therefore, increasing kVp will increase the number of x-rays reaching the cassette, increasing the image blackening and decreasing image contrast.