• Generators of ultrasonic vibrations for medical purposes usually supply a frequency of 800 to 1,000 kilocycles per second, at intensities ranging up to a maximum of 2.5 to 3 watts per square centimeter. The destructive effects of higher intensities are well known, but it is doubtful whether they will prove useful for the removal of tumors, disintegration of calculi, or destruction of bacteria in foci of infection. Nondestructive doses are a we/come addition to the measures used to relieve painful conditions in the neuromuscular and skeletomuscular systems. Ultrasound can be used either by the transsonation or by the echo-ranging technique to outline deep-lying masses of soft tissue, whether normal or diseased; it has therefore shown promise of diagnostic application.
Friedland F. PRESENT STATUS OF ULTRASOUND IN MEDICINE. JAMA. 1957;163(10):799–803. doi:10.1001/jama.1957.02970450001001
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