PMID: 9525765Apr 3, 1998Paper

Current patterns and electrode types for single-source electrical impedance tomography of the thorax

Annals of Biomedical Engineering
T F Schuessler, J H Bates

Abstract

Electrical impedance tomography (EIT) estimates the spatial distribution of the electrical tissue properties in a cross section of the body. In the present study, we investigated how the quality of static thoracic images obtained from EIT systems with a single current source and sink is affected by the current pattern employed in the presence of measurement noise. The reconstructed images best reproduced our computational phantom when current source and sink were placed at neighboring electrodes. In this case, the mean squared reconstruction error was an order of magnitude smaller than for all other patterns of current injection studied. At a signal-to-noise ratio of 50 dB, 60% of the reconstructions converged successfully with source and sink at neighboring electrodes, while only 10% or less converged for all other configurations. We relate these results to the fact that neighboring currents strengthen the diagonal structure in the Hessian matrix of the iterative reconstruction process that we employed. We also tested the effects on the reconstruction error of the number and type of electrodes. We found that "compound electrodes" that permit voltage measurement at the site of current injection did not yield any practical impro...Continue Reading

Citations

Oct 10, 2006·Physiological Measurement·Xuetao ShiRuigang Liu

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.