San Nicolò M, Moroder E
Radiol Med. 1986 Jul-Aug;72(7-8):579-83.
Magnification in mammography is changing for the worse if the goal is to show objects (microcalcifications) which are smaller or of the same size as the focal spot of the x-ray tube. A radiograph without intensifying screens offers more information than a standard screen-film mammography. Magnification yields an easier visibility of microcalcifications larger in size than the focal spot; there are the disadvantages of the microfocal tube. With the intensifying screens now in use the most profitable focal spot size in mammography seems to be 0.4-0.6 mm.
如果目标是显示与X射线管焦点尺寸相同或更小的物体（微钙化），那么乳腺摄影中的放大效果正变得更差。一张没有增感屏的X光片比标准的屏-片乳腺摄影提供更多信息。放大能使尺寸大于焦点的微钙化更容易被看到；这是微焦点管的缺点。对于目前使用的增感屏，乳腺摄影中最有利的焦点尺寸似乎是0.4 - 0.6毫米。
