Journal ArticleDOI
An electric current tomograph
TLDR
A description is given of an instrument designed to acquire data for the construction of images of internal body structures based on measurements of electrical impedance made from a set of electrodes applied around the periphery of the body.Abstract:
A description is given of an instrument designed to acquire data for the construction of images of internal body structures based on measurements of electrical impedance made from a set of electrodes applied around the periphery of the body. The instrument applies currents at 15 kHz in any desired pattern to 32 electrodes and measures the resulting voltage at each electrode. The construction of a test phantom is also described and the results of initial studies showing the distinguishability of targets of differing sizes and conductivities placed in the phantom are reported. The system is able to distinguish the presence of 9-mm-diameter insulators or conductors placed in the center of a 30-cm-diameter circular tank of salt water. This system is capable of implementing an adaptive process of produce the best currents to distinguish the unknown conductivity from a homogeneous conductivity. >read more
Citations
More filters
Journal ArticleDOI
Electrical Impedance Tomography
TL;DR: A survey of the work in electrical impedance tomography can be found in this article, where the authors survey some of the most important works in the field. Butt.t.
Journal ArticleDOI
NOSER: An algorithm for solving the inverse conductivity problem
TL;DR: An algorithm is explained that is used to make images from electrical impedance data measured on the boundary of a circle in two dimensions, based on the method of least squares, which does not reproduce the conductivity accurately, but yields useful images.
Journal ArticleDOI
Optical time-of-flight and absorbance imaging of biologic media
TL;DR: Model measurements confirmed TOFA principles in systems with a high degree of photon scattering; rat images, which were constructed from the variable time delays experienced by a fixed fraction of early-arriving transmitted photons, revealed identifiable internal structure.
Journal ArticleDOI
Electrical impedance tomography (EIT) in applications related to lung and ventilation: a review of experimental and clinical activities.
TL;DR: This review article is a summary of the publications dealing with the pulmonary applications of electrical impedance tomography (EIT) published over 15 years and several aspects of the performed EIT measurements summarized.
Journal ArticleDOI
ACT3: a high-speed, high-precision electrical impedance tomograph
Gary J. Saulnier,R.D. Cook,D.G. Gisser,J.C. Goble,Clark G. Hochgraf,David Isaacson,Jonathan C. Newell +6 more
TL;DR: Presents the design, implementation, and performance of Rensselaer's third-generation adaptive current tomograph, ACT3, a 32-electrode system that is capable of applying arbitrary spatial patterns of current.
References
More filters
PatentDOI
Applied potential tomography
TL;DR: In this paper, the surface contact electrodes are located in a closed loop or rosette array on one planar or nominally planar, skin surface of a body to be investigated, and electrically connected to data acquisition and processing equipment.
Journal ArticleDOI
Distinguishability of Conductivities by Electric Current Computed Tomography
TL;DR: Criteria for the distinguishability of two different conductivity distributions inside a body by electric current computed tomography (ECCT) systems with a specified precision are given.
Journal ArticleDOI
Applied potential tomography: possible clinical applications
TL;DR: It is concluded that the most promising way forward to clinical application in the short term is to use dynamic as opposed to static imaging.
Journal ArticleDOI
An Impedance Camera for Spatially Specific Measurements of the Thorax
TL;DR: An impedance camera to generate electrical impedance images of the thorax is designed and built and it is found that some of the admittance measurements change 25% in humans with forced respiration.
Journal ArticleDOI
Current topics in impedance imaging
TL;DR: A definition of 'best' currents to apply to an electrode array on the surface of a body in order to distinguish between the conductivity inside the body and a conjectured conductivity is introduced.