Ultrasound therapy is a treatment used by physical therapists or occupational therapists to relieve pain and to promote tissue healing. There are two main types of ultrasound therapy: thermal and mechanical. Both use sound waves generated by a transducer head (which looks a bit like a microphone) to penetrate soft tissues. The difference between the two types of ultrasound therapy is the rate at which the sound waves penetrate the tissues.
https://www.verywellhealth.com/what-is-ultrasound-therapy-2564506
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