Journal ArticleDOI
Magnetic induction tomography: hardware for multi-frequency measurements in biological tissues.
TLDR
On-line spectroscopy of tissue conductivity with low spatial resolution appears feasible, thus enabling applications such as non-invasive monitoring of brain oedema, according to a new MIT hardware developed consisting of a coil system with planar gradiometers and high-resolution phase detector.Abstract:
Magnetic induction tomography (MIT) is a contactless method for mapping the electrical conductivity of tissue. MIT is based on the perturbation of an alternating magnetic field by a conducting object. The perturbation is detected by a voltage change in a receiver coil. At physiologically interesting frequencies (10 kHz-10 MHz) and conductivities ( 100 kHz is possible. On-line spectroscopy of tissue conductivity with low spatial resolution appears feasible, thus enabling applications such as non-invasive monitoring of brain oedema.read more
Citations
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PatentDOI
Magnetic induction tomography
TL;DR: In this article, a magnetic induction tomography (MIT) apparatus comprises an excitation signal generator (70), a primary excitation coil (50), an active reference source (175), and a signal distribution network (115).
Journal ArticleDOI
The smart car seat: personalized monitoring of vital signs in automotive applications
TL;DR: Three embedded measurement techniques for non-contact monitoring of vital signals have been investigated and preliminary results obtained during test drives on German city roads and highways are discussed.
Journal ArticleDOI
Biological tissue characterization by magnetic induction spectroscopy (MIS): requirements and limitations
TL;DR: The presented technique renders possible the resolution of (patho-) physiological changes of the electrical conductivity when applying highly resolving hardware and elaborate signal processing.
Journal ArticleDOI
Mobile Noncontact Monitoring of Heart and Lung Activity
TL;DR: The fundamental drawbacks and limitations of these methods are discussed, including a detailed stability analysis of the capacitively coupled ldquoright legrdquo in capacitive ECG measurements with mismatching electrode capacities.
Journal ArticleDOI
Solution of the inverse problem of magnetic induction tomography (MIT).
TL;DR: An inverse solver based on the Gauss-Newton-one-step method for differential imaging is developed, and four different regularization schemes are implemented and tested, demonstrating the feasibility of difference imaging with MIT.
References
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Journal ArticleDOI
The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues
TL;DR: A parametric model was developed to enable the prediction of dielectric data that are in line with those contained in the vast body of literature on the subject.
Journal ArticleDOI
The specific resistance of biological material—A compendium of data for the biomedical engineer and physiologist
L. A. Geddes,L. E. Baker +1 more
TL;DR: The paper traces the history of, and tabulates determinations of the electrical resistivity of blood, other body fluids, cardiac muscle, skeletal muscle, lung, kidney, liver, spleen, pancreas, nervous tissue, fat, bone, and other miscellaneous tissues.
Journal ArticleDOI
Magnetic induction tomography. A measuring system for biological tissues.
TL;DR: A single‐channel magnetic induction system operating at 10 MHz has been constructed and the imaginary part of the perturbation in the sensed magnetic field was found to be proportional to saline conductivity, consistent with theoretical prediction.
Journal ArticleDOI
A feasibility study of in vivo electromagnetic imaging.
S Al-Zeibak,N H Saunders +1 more
TL;DR: An electromagnetic system is described which has the potential to generate useful in vivo images of body structure and is shown that objects with electrical conductivities corresponding to fat and fat-free tissue can be differentiated and that the internal and external geometry of simple objects can be sensed.
Journal ArticleDOI
Electrodeless Measurements of the Effective Resistivity of the Human Torso and Head by Magnetic Induction
Peter P. Tarjan,Richard McFee +1 more
TL;DR: A magnetically coupled impedance measuring instrument has been developed for determining an effective electrical resistivity of human subjects without electrodes.