Final answer:
Option 1). Kilovoltage (kV) settings for X-ray machines are chosen based on the density of tissues to be imaged; settings such as 70 kV may be required for denser tissues like the abdomen, whereas lower settings are used for chest radiographs.
Step-by-step explanation:
The inquiry concerns the proper kilovoltage (kV) settings for various X-ray examination types. Kilovolts (kV) is the unit of measurement for X-ray tube voltage. It is important because it controls the energy and penetrating power of the X-rays produced. For imaging less dense tissues, like a chest radiograph, where the contrast between air-filled spaces and soft tissues or bones is significant, lower energy X-rays, like those produced with a setting of 50.0 kV, are appropriate. On the other hand, denser structures, such as a cast-covered extremity, may require a higher energy level—100 kV—to adequately image or obtain a sufficient image during an AP abdomen scan. This is because dense tissues absorb more X-rays.