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Microwave therapy systems designed to warm localized body tissues one to two centimeters below the skin due to tissue resistance to the pass of high-frequency electromagnetic radiation. These systems typically include a magnetron oscillator (frequency of 2.45 GHz is typical) and applicators that act as reflectors to focus the wave onto the desired area. Microwave diathermy systems radiate energy that can be more directly focused than radio-frequency (shortwave) energy; they are particularly useful in heating high-water-content tissues. Most of these systems are used to promote healing and pain relief (e.g., to treat muscle spasms and joint contractures) and in the treatment of neurological problems (e.g., sciatica).
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