[Image quality in film and xero mammography. Second paper. Reproduction of medium range contrast (author's transl)].

In our first paper we dealt with the reproduction of low contrast ranges during the radiological examination of the breast. In the present paper we are concerned with medium contrast ranges, using a semi-objective procedure. This again depended on visual evaluation of test films of grids with variable grid ratios. For mammography rotating molybdenum and tungsten tubes with various filters were available. The advantages of xere radiography in rendering detail were less marked in these medium contrast ranges. The disadvantage of scatter is again less marked, but the resolution of non screen film for small and medium-sized objects is considerably greater. However, xero-radiography, using a tungsten tube with 0.5 mm. Al. filtration represents a satisfactory compromise between image quality and radiation dose for the demonstration of small and medium contrast ranges.