Increased kilovoltage improves which aspect of radiography?

Increased kilovoltage primarily improves part penetration in radiography. When kilovoltage is raised, the energy of the X-ray photons increases, allowing them to penetrate denser tissues more effectively. This is particularly important when imaging thicker body parts, as higher energy photons can pass through more of the body without being absorbed or scattered, resulting in a clearer image of internal structures.

The ability to penetrate tissues adequately ensures that the resulting images are diagnostic-quality without excessive exposure time. Higher kilovoltage settings can reduce the likelihood of motion artifacts due to shorter exposure times. This means that it is essential to balance penetration with contrast, as while higher kilovoltage enhances penetration, it can sometimes reduce image contrast due to the increased amount of scatter radiation reaching the detector.

Other answer choices may involve important concepts in radiography, such as image contrast, filtering of low-energy photons, and reducing patient dose, but the most direct correlation with increased kilovoltage is the improvement in part penetration. This makes it the most relevant choice in the context of the question.