FURTHER EVALUATION OF HEATING BY MICROWAVES AND BY INFRARED AS USED CLINICALLY

Journal/Book: Reprinted from The Journal of the American Medical Association November 26 1955 Vol. 159 pp. 1286 and 1287. 1955;

Abstract: Gordon M. Martin M.D. and J. F. Herrick Ph.D. Rochester Minn. From the Section of Physical Medicine and Rehabilitation (Dr. Martin) and the Section of Biophysics and Biophysical Research (Dr. Herrick) Mayo Clinic and Mayo Foundation. Read before the Section an Physical Medicine and Rehabilitation at the 104th Annual Meeting of the American Medical Association Atlantic City June 8 1955. The Mayo Foundation is a part of the Graduate School of the University of Minnesota. 1.Gersten J. W.; Wakim K. G.; Stow R. W. and Krusen F. H.: A Comparative Study of the Heating of Tissues by Near and Far Infrared Radiation Arch. Phys. Med. 30: 691-699 (Nov.) 1949. 2. Schwan H. P. and Piersol G. M.: The Absorption of Electromagnetic Energy in Body Tissues: A Review and Critical Analysis Am. J. Phys. Med. 33: 371-404 (Dec.) 1954. Although a number of basic studies of the heating effects of infrared energy and diathermy have been made there still remains considerable confusion regarding the comparative effectiveness of various sources of heat an human tissue. Infrared energy for radiant heating has been used for many years. The infrared generators are safe simple to use and inexpensive and are known to provide effective heating of at least the more superficial tissues. During the last 25 years physicians have followed with interest the development of various types of generators of high-frequency electromagnetic energy (diathermy equipment) for heating tissues at relatively greater depths than can be effectively heated with infrared. Diathermy machines have been expensive more difficult to use and if improperly used fraught with some danger of bums and discomfort. Since it has been shown that the temperature in muscular tissue can be raised significantly with a 20 minute application of infrared energy1 as well as with diathermy one might be inclined to conclude that infrared energy may be as effective as some types of diathermy. Likewise an the basis of certain theoretical considerations and some experimental data it has been stated2 that microwave apparatus operating at 2 450 megacycles will not provide a significantly greater increase of temperature in deep tissue than will infrared. ... ___MH

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