CLINICAL MEDICINE

Detailed explanation-1: -A lower kVp will make the x-ray beam less penetrating. It will result in a more substantial difference in attenuation between the different parts of the subject, leading to higher contrast.

Detailed explanation-2: -However, the kVp has a greater effect on the image when using film-screen IRs. Increasing the kVp increases IR exposure and the density produced on a film image, and decreasing the kVp decreases IR exposure and the density produced on a film image (Figure 10-4).

Detailed explanation-3: -Image quality Exposure at the image receptor increases approximately by the fifth power of the change in kVp (due to a combination of increased photon number and penetrability), such that a 15% increase in kVp doubles the intensity at the detector 7, 8.

Detailed explanation-4: -An increase in kVp extends and intensifies the x-ray emission spectrum, such that the maximal and average/effective energies are higher and the photon number/intensity is higher.