Which type of sound is used for ultrasonic imaging?

Ultrasonic imaging utilizes sound waves that are above 20,000 Hz. This range of frequencies is known as "ultrasound" and is beyond the normal hearing capability of humans, which typically ranges up to about 20,000 Hz.

In the context of ultrasonic imaging, such as medical ultrasound, these high-frequency sound waves are used to create images of structures within the body. The ultrasound waves can penetrate tissues and reflect off different structures, enabling the creation of detailed images based on the time it takes for the echoes to return. This technique is widely used due to its non-invasive nature and ability to provide real-time imaging without the need for ionizing radiation, making it safe for both patients and medical professionals.

Understanding this aspect emphasizes the importance of the frequency range for effective imaging and differentiates it from low-frequency sounds or those within the normal hearing range, which are not suitable for the same applications in imaging technologies.