Diffuse-scattering image

This technique involves the creation of a two-dimensional image of skin perfusion. It operates by emitting laser light on to the skin tissue, which upon partial absorption and diffuse scattering, is then reflected with doppler shifted frequencies from blood cells and with unshifted frequencies from stationary tissue. It is a popular method, as it is easy to use and non-invasive, however subjects must refrain from smoking for 4 h prior to measurements and no caffeine intake is permitted 1 h prior to measurements.26... 

DF imaging using the inelastic, diffusely scattered electrons (near the central beam), which, it is assumed, arise predominantly from noncrystalline regions of the specimen (Clarke 1979a McLaren and Etheridge 1980). 

Figure 8.36. DF image formed with diffusely scattered electrons showing a band about 10 nm wide along a grain boundary between two olivine grains in a hot-pressed olivine-basalt aggregate annealed for 200 hours near 1250°C at 1 GPa. (From Vaughan and Kohlstedt 1982.)...

All such models present a dilemma. X-ray diffraction patterns are analysed most easily in terms of two components (sharp diffraction images from the crystalline regions and diffuse scattering from non-crystalline regions), even though there... 

The diffuse scattering technique suggests amorphous-film thicknesses that are 50-100% larger than are found by high-resolution EM (HREM), i.e., at least part of the image obtained from diffusely scattered electrons must be... 

In diffraction contrast images made in a cluster of split diffraction spots, orientation domains exhibit differences in brightness (i.e., domain contrast), especially for conditions close to 5 = 0 where the intensity variation with, s is steep (Fig, 35). The presence of translation variants is not reflected in the diffraction pattern, except by some diffuse scattering. 

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