This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.

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The position of the detectors in SEM systems also affects the image contrast. For specimens having a large topographic contrast, regions located in valleys or wells are more easily imaged using an in-lens detector than a lateral detector (e.g. Everhart-Thornley (ET) detector). Figure 4572 gives an example. The two images were taken at 1 keV with an in-lens detector (Figure 4572 (a)) and a ET detector (Figure 4572 (b)). The shadowing effects are more pronounced for lateral ET detector with respect to the in-lens detector as indicated by circle A.  For small hills, the position of the ET detector introduced asymmetries in the imaging of equally inclined surfaces shown by circle B.

[1] J. Cazaux, (2005) Recent developments and new strategies in scanning electron microscopy, Journal of Microscopy, 217, 16–35.