Abstract
My role in joining the symposium is to discuss in general the possibilities of betatron therapy in cancers of the nose-and-throat area and its relation to conventional x-rays, and to present a few irradiated cases. The main question is what is the sense of using megavoltage radiations in lesions which are close to the surface and to which conventional x-ray may also deliver an adequate, high tumor dose. The betatron may produce two types of radiation: high-energy x-ray beam and highenergy electron beam. Their depth dose distributions, and accordingly their indications, are entirely different. Figure 1 shows the differences in depth dose distribution. In the curve of conventional 400 kvp the maximal dose is at the surface and the decrease is fast, so that at 10 cm. depth the dose is less than 40% of the maximum. In the curve for the 23 mev betatron x-ray beam, the dose is
Published Version
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