Final answer:
To improve image quality for deeper structures using ultrasound, increase depth, decrease frequency, and increase focus depth to ensure proper penetration and optimal imaging of the target area.
Step-by-step explanation:
The student's question pertains to improving image quality when using ultrasound (US) to visualize deeper structures. The correct adjustment to improve image quality for deeper structures would be B) Increasing depth, decreasing frequency, increasing focus depth. Increasing the depth setting is straightforward, as deeper structures require more penetration by the ultrasound. Decreasing the frequency of the ultrasound waves is necessary because lower frequency waves can penetrate further, although with a trade-off in image resolution. Finally, increasing the focus depth ensures that the focal point is at an appropriate level for imaging the structures of interest.