Increasing kilovoltage in radiography primarily increases

• A. Exposure latitude and long-scale contrast
• B. Patient dose
• C. Short-scale contrast
• D. Image sharpness

Answer: (A)

Raising kilovoltage increases the energy of the x-ray photons, so more photons penetrate the patient and reach the image receptor. This reduces the difference in attenuation between tissues, producing a longer gray scale—low-contrast, or long-scale, contrast. Because the image becomes less sensitive to exact exposure values, the range of exposures that still yield a diagnostically acceptable image widens, known as exposure latitude. It doesn’t primarily improve sharpness, which is governed more by geometric factors like focal spot size and motion, and it doesn’t inherently increase patient dose—when kVp is higher, you can often reduce mAs to maintain receptor exposure, which can lower dose. Short-scale contrast is produced with lower kVp.