If the early stages of a disease begin with the involvement of a small area of cells or tissue, the early diagnosis of pathologic changes by means of radio graphy should concentrate first on the detection of such minute changes. The ideal solution would be to produce X-ray images of findings much finer than those observable by the naked eye, and herein lies a new field of research that is believed to be worth developing. The introduction of a 0.3 mm focal-spot rotating-anode tube about 25 years ago opened the way to the clinical application of magnification radiography. Due to the postwar...

In spring this year it will be 35 years since I began to study rotation technique as applied to radiology. In 1947 the name rotation radiography was publicly adopted for the application of this technique to roentgenography. Since then our study has revealed that the technique in presenting the axial transverse cross section figure is valuable not only in diagnosis but also in radiotherapy. Our books on "Conformation Radiotherapy - Rotation Technique as Applied to Radiography and Radiotherapy of Cancer" and" An Atlas of Axial Trans verse Tomography and its Clinical Application" were published...