Abstract
The latest diagnostic method in cross sectional radiography is making for an enormous increase of image information for highly effective and precise diagnostic analysis. In up-to-data computed tomography utilitying x-ray and radioisotopes, electronic signals caught by the detector are fed into the computer system to do image formation and analysis immediately while in conventional tomography the objective-plane with a blurring of disturbing-shadows forms a photographic image on the film. In 1950,Polytome by Massiot appeared. This had much clinical applications especially for tomography of the head and bones, producing more difinable image than tomography by Grossmann. Since around 1970,a pluridirectional tomographic device had been under construction in our country. This unit is quite effective in removing redundant shadows by means of diverse blurring movements such as circulas, elliptical, spiral, hypocycloidal on top of linear and sinusoidal. Here is a discription about the process of development, present situation outlook, comparison with computed tomography and number of problems involved in relation to the tomography we developed.
