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 23 years since I began to study rotation technique as applied to radiology. In applying this technique to roentgenography the name Rotation Radiography was adopted publicly in 1946. Since then this study has revealed that the technique is valuable not only in diagnosis but also in radiotherapy, and the name Conformation Radiotherapy was publicly an nounced in 1960. Through these studies it became clear that it is possible to show the axial transverse cross section of the human body roentgenographically, which could be of great value medically, but it was...