Surface and Depth Intensities for Short Distance Low Voltage Therapy

Abstract

RECENTLY several manufacturers have introduced shock-proof x-ray tubes for operation at low voltages (up to 140 kv.p.) for superficial therapy. The enclosing of such a tube in an insulating shell, automatically increases the filtration above that of the glass shell itself, which, with the unprotected type of tube, was the only filtration. Since this inherent filtration will alter the quality of the beam and also since the shock-proof feature permits the use of shorter target-skin distances, the following measurements were undertaken in order to determine the quality, surface-field size, relationship, and relative depth intensities for such distances as might be used with this type of equipment, namely, 11, 15, and 20 cm. target-skin distances. These data have been assembled in charts, which are useful, not only for these new shockproof tubes, but also in transition from the old unprotected unfiltered superficial technic to the new type of tubes and treatment. For this work all measurements were made with ...