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Tomography Editor s : Pierre Grangeat. First published: 1 January About this book The principle of tomography is to explore the structure and composition of objects non-destructively along spatial and temporal dimensions, using penetrating radiation, such as X- and gamma-rays, or waves, such as electromagnetic and acoustic waves. Based on computer-assisted image reconstruction, tomography provides maps of parameters that characterize the emission of the employed radiation or waves, or their interaction with the examined objects, for one or several cross-sections.
Soils and Foundations , pp. Description The principle of tomography is to explore the structure and composition of objects non-destructively along spatial and temporal dimensions, using penetrating radiation, such as X- and gamma-rays, or waves, such as electromagnetic and acoustic waves. Nguyen, V, Sheppard, A, Knackstedt, M et al , 'The effect of displacement rate on imbibition relative permeability and residual saturation', Journal of Petroleum Science and Engineering, vol. Reconstruction algorithms and artifacts 8. Packman, A. Siginer , p.
Thus, it gives access to the inner structure of inert objects and living organisms in their full complexity. In this book, multidisciplinary specialists explain the foundations and principles of tomographic imaging and describe a broad range of applications. The content is organized in five parts, which are dedicated to image reconstruction, microtomography, industrial tomography, morphological medical tomography and functional medical tomography.
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The principle of tomography is to explore the structure and composition of objects non-destructively along spatial and temporal dimensions, using penetrating. Page X-ray micro-computed tomography of site Institute of Earth Sciences hosted by the University of Lausanne.
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Results 1 - 21 of It is especially important to make sure that CT scans in children are performed with appropriate exposure factors, as use of exposure settings designed for adults can result in a larger radiation dose than necessary to produce a useful image for a pediatric patient. If a physician recommends a CT scan for you or your child, the FDA encourages you to discuss the benefits and risks of the CT scan, as well as any past X-ray procedures you or your child have had, with your physician.
A CT scan should always be performed if it is medically necessary and other exams using no or less radiation are unsuitable. At this time, the FDA does not see a benefit to whole-body scanning of individuals without symptoms.
The FDA has regulations covering the safety and effectiveness and radiation control of all X-ray imaging devices, including CT. Individual states and other federal agencies regulate the use of CT devices through recommendations and requirements for personnel qualifications, quality assurance and quality control programs, and facility accreditation. The individual risk from a necessary imaging exam is quite small when compared to the benefit of aiding accurate diagnosis or intervention.