Diffusion-parameter image

The principal advantage of NMR imaging is the possibility of making spatially localized diffusion measurements [30]. One can examine by NMR imaging the concentration and location of a permeating liquid in a solid sample. A true diffusion parameter image is obtained, where calculated diffusion coefficients are encoded into an intensity scale. 

The combination of microscopic and macroscopic information is made possible by what can be called parameter imaging . In the general sense, it consists of the encoding of properties such as spectral line shifts, relaxation times, diffusion coefficients, etc., in the image by suitable combination of corresponding modules into one pulse sequence. Parameter images are to be distinguished from mere... 

Apparently the (2x1) phase cannot be attributed to the equilibrium structure at room temperature, but may be described as a quenched phase probably due a limited surface diffusion parameter. Aside of finding the ordered surface by LEED, the (4x1) structure has been imaged for the first time in real space by scanning tunneling microscopy [76] which is presented in Fig. 5 a. 

Table 7.6 Diffusion tensor imaging Parameters measured...

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