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Home ultrasound
Home ultrasound is the provision of therapeutic ultrasound via the use of a portable or home ultrasound machine. This method of medical ultrasound therapy can be used for various types of pain relief and physical therapy.
In physics, the term "ultrasound"〔http://books.google.com/books?id=vY5rXC4xlMgC&pg=PA288&lpg=PA288&dq=1mhz+ultrasound+wavelength&source=bl&ots=xX03F7uI5C&sig=_6LD38Vx-BWnYk__6jO0MyG2d5M&hl=en&ei=D57MTOOmN8KB8gaxiLyzAQ&sa=X&oi=book_result&ct=result&resnum=8&ved=0CDgQ6AEwBw#v=onepage&q&f=fal〕 applies to all acoustic energy with a frequency above the audible range of human hearing. The audible range of sound is 20 hertz – 20 kilohertz. Ultrasound frequency is greater than 20 kilohertz.
== Home ultrasound machines ==
Ultrasound energy is transferred based on the frequency and power output of the ultrasonic waves that an ultrasound machine or device creates. Home ultrasound machines and doctor's office machines both operate between 1 and 5 megahertz, however, home machines utilize pulsed ultrasonic waves while professional ultrasound machines in a doctor's office use continuous waves.
Typically, when using a home ultrasound machine, you will use it more frequently than if you were to have ultrasound treatments at a therapist's office, but the end results are the same as if using a continuous wave machine less frequently.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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