What combination of kV and mAs is recommended to decrease patient exposure?

• A. High kV with low mAs
• B. High kV with high mAs
• C. Low kV with high mAs
• D. Low mAs with high kV

Answer: (D)

The recommended combination of high kV with low mAs is effective in reducing patient exposure during radiographic procedures. When a high kilovolt peak (kV) is used, it enhances the penetration power of the x-ray beams, allowing them to pass through the body tissues more efficiently and produce a diagnostic image with less radiation.

With high kV, the x-rays have greater energy, which means that fewer x-ray photons are required to achieve the same level of image quality compared to using lower kV settings. Consequently, using low milliampere-seconds (mAs) minimizes the overall radiation dose to the patient. This approach is particularly beneficial in practice, as it helps mitigate the risk of radiation exposure while still obtaining clear imaging results.

In summary, the strategy of employing high kV combined with low mAs is a fundamental principle in radiography aimed at maintaining patient safety while ensuring diagnostic efficacy.