• Publications
  • Influence
Electrical Impedance Tomography : Methods, History and Applications
  • D. Holder
  • Computer Science, Physics
  • 31 December 2004
INTRODUCTION PART 1 ALGORITHMS The Reconstruction Problem PART 2 HARDWARE EIT Instrumentation PART 3 APPLICATIONS Imaging of the Thorax by EIT EIT of Brain Function Breast Cancer Screening with EITExpand
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Effect of skin impedance on image quality and variability in electrical impedance tomography: a model study
  • K. Boone, D. Holder
  • Medicine
  • Medical and Biological Engineering and Computing
  • 1 September 1996
A computer simulation is used to investigate the relationship between skin impedance and image artefacts in electrical impedance tomography. Sets of electrode impedance are generated with aExpand
  • 1,707
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Three-Dimensional Electrical Impedance Tomography of Human Brain Activity
Regional cerebral blood flow and blood volume changes that occur during human brain activity will change the local impedance of that cortical area, as blood has a lower impedance than that of brain.Expand
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Detection of cerebral ischaemia in the anaesthetised rat by impedance measurement with scalp electrodes: implications for non-invasive imaging of stroke by electrical impedance tomography.
  • D. Holder
  • Medicine
  • Clinical physics and physiological measurement…
  • 1 February 1992
The possible use of impedance measurement with scalp electrodes to detect cerebral ischemia non-invasively was investigated in the anaesthetised rat. Global cerebral ischaemia was induced byExpand
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Electrical impedance tomography of human brain function using reconstruction algorithms based on the finite element method
TLDR
Electrical impedance tomography (EIT) is a recently developed technique which enables the internal conductivity of an object to be imaged using rings of external electrodes. Expand
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Design and calibration of a compact multi-frequency EIT system for acute stroke imaging.
A new, compact UCLH Mk 2.5 EIT system has been developed and calibrated for EIT imaging of the head. Improvements include increased input and output impedances, increased bandwidth and improved CMRRExpand
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Multifrequency Electrical Impedance Tomography Using Spectral Constraints
TLDR
Multifrequency electrical impedance tomography (MFEIT) exploits the dependence of tissue impedance on frequency to recover an image of conductivity. Expand
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A review of errors in multi-frequency EIT instrumentation.
Multi-frequency electrical impedance tomography (MFEIT) was proposed over 10 years ago as a potential spectroscopic impedance imaging method. At least seven systems have been developed for imagingExpand
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Generating accurate finite element meshes for the forward model of the human head in EIT.
The use of realistic anatomy in the model used for image reconstruction in EIT of brain function appears to confer significant improvements compared to geometric shapes such as a sphere. AccurateExpand
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A novel method for recording neuronal depolarization with recording at 125–825 Hz: implications for imaging fast neural activity in the brain with electrical impedance tomography
TLDR
A novel method in which contemporaneous evoked potentials are subtracted is presented with current applied to cerebral cortex during evoked activity; although the signal is smaller than at DC by about 10×, the principal noise from the EEG is reduced by about 1000×, resulting in an improved SNR. Expand
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