American Society of Radiologic Technologist (ASRT) Practice Exam

What is a common consequence of improved imaging techniques that increase kVp levels?

1. Higher doses of radiation

2. Reduced image quality

3. Increased energy of x-ray photons

4. Lower patient throughput

The correct answer is: Increased energy of x-ray photons

The choice of increased energy of x-ray photons is the correct response because when kVp (kilovolt peak) levels are raised in imaging techniques, it directly affects the energy of the x-ray photons produced. Higher kVp settings increase the voltage potential applied to the x-ray tube, which enhances the speed and energy of the electrons striking the anode. This results in the production of x-ray photons with higher energy, allowing for better penetration through denser tissues, leading to clearer images of internal structures. This increase in photon energy plays a crucial role in diagnostic radiology as it can improve the quality of the image by providing better contrast and detail. It allows for the visualization of anatomical features without the need for excessive radiation doses, as higher energy photons are more efficient at passing through tissues. Other options typically associated with increased kVp levels can lead to complications, but they do not characterize the primary consequence of the increase in photon energy. For instance, while higher doses of radiation could occur if kVp is increased without proper adjustment in exposure time or mAs, this is not inherently a consequence of raising kVp itself. Similarly, reduced image quality is generally a result of improper technique or poor equipment calibration, and lower patient throughput is not a direct consequence