The induction of hyperthermia by ultrasound; its value and associated problems: II. Scanned-plane transducer.
A system is described in which large superficial areas of tissue may be heated using a single plane ultrasonic transducer scanned in a raster fashion. The shape of the heated area is determined by the movement of a microswitch which is activated when it strikes the rigid edge of a hole of the required shape cut in a plate. Temperature profiles are presented. They are measured in pig thigh muscle, and are generated by 0.75 and 3.0 MHz ultrasound scanned over areas up to 7 cm X 7 cm. It was found that uniform heating could be obtained over the area scanned by the central portion of the ultrasonic beam.
D000818:Animals; D001831:Body Temperature; D006979:Hyperthermia, Induced / Q000009:adverse effects; D009132:Muscles / Q000502:physiology; D013552:Swine; D013997:Time Factors; D014465:Ultrasonics