Final answer:
mAs and kV in electronic imaging regulate the exposure and contrast, respectively, but not the resolution or brightness of the image. The resolution is influenced by the imaging system's detector characteristics, and brightness is often adjusted post-acquisition. Option 1,2 are correct.
Step-by-step explanation:
In electronic imaging, mAs (milliampere-seconds) and kV (kilovoltage) are settings used on x-ray machines that control the exposure and contrast of the image produced. However, these settings do not regulate the resolution or the sharpness of the image.
Resolution is primarily determined by the imaging system's detector, such as its pixel size in digital systems, and the sharpness of the image is affected by factors such as the quality of the equipment, the motion of the subject, and the image processing algorithms.
Similarly, brightness in digital imaging is more commonly controlled via post-processing software or by adjusting the display monitor settings. Therefore, mAs and kV do not directly influence the resolution or brightness of the electronic image.
What mAs and kV Do Not Regulate
mAs affects the number of x-rays, or the exposure, by controlling the quantity of electrical current in the x-ray tube, which in turn affects the duration of x-ray production. The kV, on the other hand, controls the x-ray beam's energy or contrast between different tissues.
Yet, neither of these settings directly regulates the imaging system's ability to resolve fine detail (resolution) or the luminous intensity (brightness) of the image presented on the display. So, the answer to the student's question is that mAs and kV do not regulate 2) Resolution and 3) Brightness.