New PDF release: Advanced Tomographic Methods in Materials Research and

By John Banhart

ISBN-10: 0199213240

ISBN-13: 9780199213245

Tomography presents 3-dimensional pictures of heterogeneous fabrics or engineering elements, and provides an unheard of perception into their inner constitution. through the use of X-rays generated via synchrotrons, neutrons from nuclear reactors, or electrons supplied by way of transmission electron microscopes, hitherto invisible constructions will be published which aren't obtainable to traditional tomography in line with X-ray tubes.This ebook is especially written for utilized physicists, fabrics scientists and engineers. It offers specific descriptions of the hot advancements during this box, specifically the extension of tomography to fabrics examine and engineering. The booklet is grouped into 4 elements: a normal advent into the foundations of tomography, photo research and the interactions among radiation and subject, and one half each one for synchrotron X-ray tomography, neutron tomography, and electron tomography. inside those elements, person chapters written via diverse authors describe vital models of tomography, and in addition offer examples of purposes to illustrate the capability of the tools. The accompanying CD-ROM includes a few common information units and courses to reconstruct, examine and visualise the 3-dimensional facts.

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Example text

3 Discrete tomography There are situations in which, in addition to the projection data, we have some further information about the object to be reconstructed. An example is when we know that the object consists of homogeneous regions of known materials, which is often the case in non-destructive testing. Such information can be included into the reconstruction process, and this makes it possible to use fewer projections than would be needed otherwise to achieve the same quality reconstruction.

AiJ ) with the vector x. ) It is shown in Herman (1980), p. 20 has a solution at all and x(0) is selected to be the vector of all zeroes, then the sequence x(0) , x(1) , x(2) , . . 20 that among all the solutions has the smallest norm. 22 is proportional not to J, which is large, but to the number of non-zero components in aik , which is typically much smaller (see above). g. 21 is never stored at all, but rather the locations and sizes of the non-zero components of aik are calculated based on the geometry of the situation (see Fig.

2 of Herman (1980), also known as direct Fourier inversion, which is a straightforward application of the projection theorem, as illustrated in Fig. 2. In its numerical implementation, the 1-dimensional fast Fourier transform (FFT) is used to estimate from the given projection data F2 f a finite number of equally placed points on a finite number of lines through the origin. 5, to recover f . A problem with this method is that if a simple interpolation (such as bilinear) is used, then the reconstruction quality is much inferior to that of FBP.

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Advanced Tomographic Methods in Materials Research and Engineering by John Banhart


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