Final answer:
Ultrasound is the technique that uses high-frequency sound waves to predict composition, often used for medical diagnostics such as fetal monitoring because of its safety and non-invasive nature.
Step-by-step explanation:
The imaging technique that uses high-frequency sound waves to predict composition is Ultrasound. This technique, also known as ultrasonography, generates an echo signal from the transmission of sound waves into the body, which is then converted by a computer into a real-time image. This method is particularly useful for monitoring pregnancies because it is the least invasive and involves no electromagnetic radiation. Ultrasound technology can study various aspects of the human body, including heart function, blood flow, and the development of a fetus. The sound used in ultrasounds is beyond the range of human hearing and thus is called ultrasound. This technology can provide density information by reflecting sound at areas where changes in density are the greatest.