Electron image converters consisting of single-crystal scintillator, l
ight-optics and slow-scan CCD (charge coupled device) have proven to b
e suited for the low energy range below 10 keV provided the fundamenta
ls of dimensioning are applied in a proper manner. After discussing th
e dependence of the DQE (detection quantum efficiency) on the paramete
rs of the components and on electron energy, it is shown by Monte Carl
o simulation that even at 5 keV a satisfactory DQE of .6 can be obtain
ed at a high resolution limited by the light-optics. Already below 50
keV a resolution of 1 mum was measured.