Abstract
A X-ray tomographic study was made on the auditory organs of cadaveric and clinical persons, and the following results were obtained.1. The most preferable technic of photography was as follows; the objective person a lied down on abdomen, holding his or her objective ear on the X-ray film, turning his or her head a little to the opposite side, and at the same time the head was bowed 15 degrees downwards. The X-ray tube was traveled from the head towards the legs along the arxis of the body.2. To take the tomograph of the inner ear, 0.5cm should be added to the length of the external auditory canal which had been measured before the manipulation, as the depth of sectioning.3. In cases of acute and chronic otitis media, pathological changes in a definite layer were easily revealed in tomographic radiograms. Especially, the pattern of destruction of the temporal bone was clearly observed in the cases of otitis media cholesteatomatosa. In addition, differential diagnosis between the complete and the incomplete atresia of the external auditory canal was very sure by tomographic observation.
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