American Registry of Radiologic Technologists (ARRT) Practice Exam

In electronic imaging, mAs (milliampere-seconds) and kV (kilovoltage) primarily influence image density/brightness and contrast. mAs affects the quantity of photons produced during the exposure, directly impacting the overall brightness of the image, while kV influences the energy of the x-ray beam, affecting penetration and contrast by determining the range of photon interactions with tissues.

However, density/brightness and contrast are not aspects that mAs and kV do not regulate. Spatial frequency, which relates to the resolution and level of detail that can be appreciated in an image, is influenced by aspects of the imaging system, including the detector's characteristics and the quality of the image processing.

Furthermore, image acquisition time, which refers to the time taken to capture an image, is related to exposure parameters but is more about the system's configuration rather than a direct regulation of mAs and kV. Therefore, considering these explanations, it is clear that image sharpness is also influenced by other factors, but mAs and kV do not directly regulate spatial frequency.