An imaging technique that uses high frequency sound waves to generate images of internal structures.

• A. Ultrasound
• B. Physical therapy
• C. Anger management
• D. Bipolar disorder

Answer: (A)

Imaging with high-frequency sound waves works by emitting sound into the body and listening for the echoes that bounce back from tissues. The machine then uses those echoes to construct pictures, often in real time. This technique, ultrasound, is valued because it doesn’t use ionizing radiation and can visualize soft tissues and moving structures, making it ideal for examining internal organs and developing fetuses. That’s why it’s the correct choice here. The other options describe therapies or conditions rather than a method of imaging, so they don’t fit the description.