Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 140 for “"electrical Impedance"”.
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Microfluidic Electrical Impedance Spectroscopy
… device capable of measuring changes in impedance valuesof microfluidic cell cultures. Tocharacterize this, an interdigitated array of electrodes was patterned over glass, where it was then bonded to a series of fluidic networks created in PDMS via soft lithography. The device measured …
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Electrical impedance of methane flat flame
… this work was undertaken to determine if electrical impedance measurements of the flame are a direct indication of fuel/air ratio. Previous worked measured electrical resistance of the combustion of gases in an atmospheric combustor. From this work, it was conjectured that the complex …
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Tissue electrical impedance determination via microneedles
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Electrical impedance tomography for internal radiation therapy
… radiation therapy based on the principle of electrical impedance tomography (EIT). A novel procedure utilizing brachytherapy needles as electrodes is proposed to map the internal electrical conductivity of the tissue. Since cancerous tissue exhibits different levels of conductivity than …
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An approximation method for electrical impedance tomography
Electrical impedance tomography is an imaging method with applications to geophysics and medical imaging. A new approximation is presented based on Nachman's 2-dimensional construction for closed domains. It improves upon existing approximations by extending the range of application from resolving …
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High fidelity imaging in electrical impedance tomography
… the computational reconstruction of images using Electrical Impedance Tomography (EIT). EIT is an imaging method, in which electrical currents are injected through electrodes into a conducting volume and the resulting potential distribution is measured at surface electrodes. From these potentials, …
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Three dimensional modelling of Electrical Impedance Tomography
Electrical Impedance Tomography (ElT) is an emerging imaging technique with applications in the medical field and in the field of industrial process tomography (lPT). Untilrecently, data acquisition and image reconstruction schemes have been constructed with the assumption that the object being …
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Discrete mathematical models for electrical impedance tomography
Electrical Impedance Tomography (EIT) is a non-invasive, portable and low-cost medical imaging technique. Different current patterns are injected to the surface of a conductive body and the corresponding voltages are measured also on the boundary. These mea-surements are the data used to infer the …
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Parallel algorithms for three dimensional electrical impedance tomography
This thesis is concerned with Electrical Impedance Tomography (EIT), an imaging technique in which pictures of the electrical impedance within a volume are formed from current and voltage measurements made on the surface of the volume. The focus of the thesis is the mathematical and numerical …
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Electrical Impedance Tomography in 3D: Characterization and Evaluation
Electrical Impedance Tomography (EIT) uses body surface electrical stimulation and measurements to create images of the conductivity of contrasting fluids. 3D EIT has a strong potential to image regional inhomogeneities in the lungs. This thesis seeks to characterize 3D measurement patterns, …
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Electrical Impedance Tomography for Perfusion Imaging and Monitoring
Electrical impedance tomography (EIT) is a medical imaging technology that uses boundary electrodes to inject stimulus currents and measure the resulting potential distributions. These potentials are measured using electrodes which are in turn used to reconstruct conductivity changes within the …
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Statistical Preconditioning and Quantitative Imaging for Electrical Impedance Tomography
… iterative scheme to solve the inverse problem of electrical impedance tomography (EIT), an ill-posed and nonlinear inverse problem in which we look to approximate the admittivity distribution inside a body given a discrete set of current and voltage measurements taken at the boundary. The …
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Electrical impedance measurements of the uterine cervix in pregnancy
This is the first time that electrical impedance studies have been performed on the pregnant cervix.In this thesis the following has been demonstrated:1. An inter-observer variability in resistivity readings, initially of the order of 20%, but decreasing to 1% once proficiency with the technique …
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Rot detection in wooden poles using electrical impedance tomography
… that was chosen for this project was that of electrical impedance tomography in which an image of the permittivity in a cross section would be created from impedance measurements made between electrodes attached to the boundary of the pole.
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The Investigation and Implementation of electrical Impedance Tomography Hardware System
Electrical impedance tomography (EIT) is a medical imaging technology that provides a tomographic representation of the distribution of electrical impedance within the body. As the electrical impedance varies for different body tissues, it is possible to characterize tissues from the images and to …
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Effects of temperature on the electrical impedance of piezoelectric elements
… (PZT) materials for tracking the structural impedance to qualitatively identify damage. The mechanical impedance of a structure is a function of the structure's mass, stiffness, damping, and structural boundary conditions. Changes in any of the above-mentioned properties lead to a change in …
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Development of an electrical impedance tomograph for complex impedance imaging
This project concerns the development of electrical impedance tomography towards the production of complex impedance images. The prime intention was to investigate the feasibility of developing suitable instrumentation; but not clinical applications. It was aimed to develop techniques for the …
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A Sensor for DNA Hybridization Using Fluorescence and Electrical Impedance Detection
… of biorecognition events by fluorescence and impedance has been established in this work. This basic DNA biosensor design involves the immobilization of thiolated single-stranded (ss) oligonucleotides (20-mer probe; 1.0 æM) on gold 7 mm half-moon transducer surfaces (with a 0.5 mm gap) to …
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