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Electrical resistance tomography (ERT) is well known as non-invasive imaging technique, inexpensive, radiation free, visualization measurements of the multiphase flows and frequently applied in geophysical, medical and Industrial Process Tomography (IPT) applications. Application of ERT in concrete is a new exploration field, which can be used in monitoring and detecting the health and condition of concrete without destroying it. In this paper, ERT model under the condition of concrete is studied in which the sensitivity field model is produced and simulated by using COMSOL software. The affects brought by different current injection values with different concrete conductivity are studied in detail. This study able to provide the important direction for the further study of inverse problem in ERT system. Besides, the results of this technique hopefully can open a new exploration in inspection method of concrete structures in order to maintain the health of the concrete structure for civilian safety.

A rapid time domain terahertz computed axial tomography (CT‐TD‐THz) system is described. The system is used to reconstruct three dimensional structure of aerospace components including: Kevlar soft shell fan containment systems, silica thermal protection tiles, and sprayed on foam thermal insulation.

In the majority of cases the term “tomography” is associated with computed X‐ray tomography. However several other physical interactions also have the ability to provide information from the inside of objects. Already traditional scanning acoustic microscopy (SAM) gives volume information for opaque materials. However, for most defect types in a homogeneous material the SAM C‐ and B‐Scans alone do not give a correct volume image. Algorithms processing data from different scan positions improve the situation significantly. But only when a number of additional measures are taken satisfactory results can be obtained. After describing the basic principles of SAM tomography an example of application is given and the results are compared to X‐ray tomography (CT) of the same object.

SPECT (Single Photon Emission Computed Tomography) provides for an invaluable non‐invasive technique for the characterization and activity distribution of the gamma‐emitting source. For many applications of radioisotopes for medical and industrial application, not only the positional information of the distribution of radioisotopes is needed but also its strength. The well‐established X‐ray radiography or transmission tomography techniques do not yield sufficient quantitative information about these objects. Emission tomography is one of the important methods for such characterization. Application of parallel beam, fan beam and 3D cone beam emission tomography methods have been discussed in this paper. Simulation studies to test these algorithms have been carried out to validate the technique.

We present an overview of work being carried out by us in the field of X‐ray and neutron imaging in general and tomography in particular. We have discussed our work on microtomography, cone beam tomography, phase imaging and phase tomography, emission tomography, neutron tomography and two phase flow being carried out by us.

X‐ray computed tomography is a powerful non‐invasive imaging technique for viewing an object's inner structures in two‐dimensional cross‐section images without the need to physically section it. The invention of CT techniques revolutionised the field of medical diagnostic imaging because it provided more detailed and useful information than any previous non‐invasive imaging techniques. The method is increasingly being used in industry, aerospace, geosciences and archaeology. This paper describes the development of an X‐ray computed tomography system for imaging of industrial materials. The theoretical aspects of CT scanner, the system configurations and the adopted algorithm for image reconstruction are discussed. The penetrating rays from a 160 kV industrial X‐ray machine were used to investigate structures that manifest in a manufactured component or product. Some results were presented in this paper.

Gamma ray tomography is a valuable tool for multiphase flow analysis in different areas of process, nuclear and mechanical engineering. Here, we introduce the design of a high resolution gamma ray tomography scanner and discuss two application examples from different technical fields.