ROENTGENOLOGIC DIAGNOSIS OF THE BRAIN BY RETOUCHING ROENTGENOGRAMS WITH SPECIAL REFERENCE TO THE SUBTRACTION AND HARMONIZATION

抄録

Among the various methods of retouching of roentgenograms by the use of TV camera in the roentgenologic diagnosis of the brain, particularly, angiograms, the method of subtraction, additive method and method of harmonization were examined. It is necessary to select subtraction or harmonization according to the purpose and site of diagnosis among these retouching methods. When the in-formation on the movement of blood circulation is needed, the additive method is applied also. These retouching methods enable collection of more diagnostic information obtained from roentgenograms.