Calcification is one of the most important sign in the roentgenologic diagnosis of cancer of the breast, though it is also often found in benign lesion. It is generally accepted that calcifications in cancer are tiny, dot-like or somewhat elongated, innumerable and irregulary grouped very close together in an area of the breast such as "grouped calcifications". Analysis of these calcifications is very usefull not only for differentiating other benign lesions but also detecting early or minimal breast cancer. In view of this point we have introduced and studied magnification compression mammography in order to obtain superior image quality of microcalcification than conventional contact mammography since 1979. Now, analysis of breast calcifications is improved most by the magnification compression spot mammography ; sharper definition of individual calcifications is produced. With performing this technique, we have invented the supplementary equipments for decreasing examination time and x-ray exposure, which can automatically and exactly devide a 8×10 in. film in quarters, and so, we have good results.
