With increasing kVp levels, using digital receptors and DR technologies, which statements are true?

• A. less differential absorption occurs and a narrower histogram results
• B. the difference between minimum and maximum incoming photon energies is reduced
• C. more anatomical data can be recorded with a lower patient dose
• D. all of the above

Answer: (D)

Increasing kVp with digital detectors makes the X‑ray beam more penetrating and shifts interaction toward scatter, so differences in tissue attenuation shrink and image contrast drops. In a DR system this reduced contrast shows up as a narrower histogram of detected pixel values, since the range of gray levels needed to represent the scene is smaller. The beam also becomes harder, and with typical filtration used at higher kVp, the low-energy portion of the spectrum is attenuated, effectively narrowing the useful energy spread that contributes to the image. Digital receptors, with their high efficiency and broad dynamic range, can preserve image quality while using lower overall exposure, meaning more anatomical detail can be captured at a lower dose. Together these effects align with all of the statements, so the best choice is that all of these are true.