Abstract
Orthopantomography for dental X-ray examinations is a kind of tomography which has a special characteristic different from any other tomographic methods. A comparative study of radiographic images formed by ordinary tomographic equipment with the attachment of slits devised by the authors and images produced by orthopantomography is presented.
As a result of comparing image-formation in orthopantomography with that of ordinary tomography using the same objects, (1) hardly any blur was observed inside the contours of the orthopantomographic image, (2) a very slight blurring effect of orthopantomography was observed on the slit side, (3) the slit played an important role in limiting the tomographic effect, and (4) consequently, orthopantomography may be considered as a very special type of tomography in the presence of slits.
