Shika Hoshasen

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To contribute to roentgen anatomy of the skull on ellipsopantomogram with Panex X-100, some experimental studies were performed by using Kilgore eleven pieces demonstration skull and a skull for anatomical exercises.
1. For the evaluation of the images of the ellipsopantomograms, three kinds of radiographs with posterio-anterior, lateral and Waters' projection were used for the comparison.
2. X-ray images of the anatomical structures of the skulls situated in focal trouth of ellipsopantomograph were analysed. The positionings of the skull varied on a specially designed table as follows.
a) Orbito-auricular plane was kept horizontal, listed as 0°.
b) Orbito-auricular plane chin down ten degrees and twenty degrees, listed as (-10), (-20) respectively and up ten degrees and twenty degrees, listed as (+10), (+20) respectively.
X-ray images on each radiogram thus obtained were analysed comparing those with reference or another pantomographic images, whether or not the image of each anatomical structure can easily be interpretable without any marking. The results of the analysis were almost compatible with those obtained by Katayama and others.
3. Although blurring or redundant images on the pantomogram are generally neglected in x-ray diagnosis, the redundant image of the inferior orbital fissure which appeared as two straight lines in horizontal at midheight of the orbits on the chin up 10° ellipsopantomogram may contribute to interpretation of the lesion of inferior orbital region. When one of the lines can not be visualised, abnormality may be suggested in the inferior orbital fissure region of the opposite side.

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