Edition : 1
Year : 2014
Description :
| This is the first book that presents a comprehensive introduction to and overview of electro-magnetic tissue property imaging techniques using MRI, focusing on Magnetic Resonance Electrical Impedance Tomography (MREIT), Electrical Properties Tomography (EPT) and Quantitative Susceptibility Mapping (QSM). The contrast information from these novel imaging modalities is unique since there is currently no other method to reconstruct high-resolution images of the electro-magnetic tissue properties including electrical conductivity, permittivity, and magnetic susceptibility. These three imaging modalities are based on Maxwell's equations and MRI data acquisition techniques. They are expanding MRI's ability to provide new contrast information on tissue structures and functions. To facilitate further technical progress, the book provides in-depth descriptions of the most updated research outcomes, including underlying physics, mathematical theories and models, measurement techniques, computation issues, and other challenging problems. Readership: Researchers, academics and graduate students in medical imaging, computational mathematics and biomedical imaging. Electro-magnetic tissue properties include electrical conductivity, permittivity and magnetic susceptibility. When properly probed by electric and/or magnetic means, their three-dimensional distributions in a subject become sources of magnetic field perturbations, which can be measured using a magnetic resonance imaging (MRI) scanner. Magnetic resonance (MR)-based electro-magnetic tissue property imaging is used to provide tomographic images of the tissue properties by investigating the sources of the magnetic field perturbations. As the probing methods, we use externally applied electric and/or magnetic fields at direct current (dc) or radio frequency (RF). The applied fields induce distributions of internal current density and magnetization, which are determined by the tissue properties. Since the induced current density and magnetization perturb the main dc field and/or RF field of the MRI scanner, we can measure their effects from MR signals. It is, therefore, important to understand the interactions among the external excitations, the tissue properties and the dc and RF fields of the MRI scanner. Based on this understanding, we can formulate forward problems to mathematically express the interactions. The external excitations will be considered as inputs and the MR signals as outputs of a system, of which characteristics are parameterized by the tissue properties. Since we control the external excitations and measure their responses from MR signals, the imaging problem turns out to be an inverse problem where the tissue properties are unknowns to be recovered. Contents:
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Link Download : http://dowt9C0BD55E762
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