CONTACT ROENTGEN THERAPY

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Abstract
IT WAS twelve years ago that I first saw the Chaoul contact therapy apparatus1 used by Prof. Woodburn Morrison at the Cancer Hospital in London, and since then I have been interested in this subject. There are only a few Chaoul machines in the United States, which were imported from Germany prior to the war. Here the Philips contact therapy apparatus is more widely used. Therefore my paper will be mostly about the Philips machine. I will speak as a clinician of its merits and shortcomings. At the risk of repetition I will briefly describe the construction of contact therapy tubes. In the Chaoul type of tube the short targetskin distance is made feasible by mounting a gold-plated nickel target at the extreme end of the tube, where it serves not only as a target but also as a filter, because the beam of roentgen rays passes through it.

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