The active fiber in a volume conductor

1974 ◽  
Vol BME-21 (5) ◽  
pp. 371-381 ◽  
Author(s):  
Robert Plonsey
Keyword(s):  
Volume Conductor ◽  
Active Fiber

Extracellular potentials and currents of a single active fiber in a restricted volume conductor

1990 ◽  
Vol 18 (3) ◽  
pp. 219-238 ◽  
Author(s):  
Natalia Trayanova ◽  
Craig S. Henriquez ◽  
Robert Plonsey
Keyword(s):  
Volume Conductor ◽  
Active Fiber ◽  
Restricted Volume ◽  
Extracellular Potentials

The Role of Computer Modeling in Electrocardiography

1990 ◽  
Vol 29 (04) ◽  
pp. 282-288 ◽  
Author(s):  
A. van Oosterom
Keyword(s):  
Electrical Activity ◽  
Computer Modeling ◽  
Body Surface ◽  
Electrical Current ◽  
The Body ◽  
Volume Conductor ◽  
Current Generator ◽  
Cardiac Electrical Activity ◽  
Source Models

AbstractThis paper introduces some levels at which the computer has been incorporated in the research into the basis of electrocardiography. The emphasis lies on the modeling of the heart as an electrical current generator and of the properties of the body as a volume conductor, both playing a major role in the shaping of the electrocardiographic waveforms recorded at the body surface. It is claimed that the Forward-Problem of electrocardiography is no longer a problem. Several source models of cardiac electrical activity are considered, one of which can be directly interpreted in terms of the underlying electrophysiology (the depolarization sequence of the ventricles). The importance of using tailored rather than textbook geometry in inverse procedures is stressed.

scholarly journals The effect of dipole housing and feeding wires in physical phantoms for EEG

2019 ◽  
Vol 5 (1) ◽  
pp. 85-88
Author(s):  
René Machts ◽  
Alexander Hunold ◽  
Jens Haueisen
Keyword(s):  
Electric Potential ◽  
Volume Conductor ◽  
Constant Current ◽  
Twisted Pair ◽  
Eeg Data ◽  
Phantom Measurements ◽  
Average Change ◽  
Electric Potentials ◽  
The Difference ◽  
Signal Sources

AbstractCurrent dipoles are well established models in the localization of neuronal activity to electroencephalography (EEG) data. In physical phantoms, current dipoles can be used as signal sources. Current dipoles are often powered by constant current sources connected via twisted pair wires mostly consisting of copper. The poles are typically formed by platinum wires. These wires as well as the dipole housing might disturb the electric potential distributions in physical phantom measurements. We aimed to quantify this distortion by comparing simulation setups with and without the wires and the housing. The electric potential distributions were simulated using finite element method (FEM). We chose a homogenous volume conductor surrounding the dipoles, which was 100 times larger than the size of the dipoles. We calculated the difference of the electric potential at the surface of the volume conductor between the simulations with and without the connecting wires and the housing. Comparing simulations neglecting all connecting wires and the housing rod to simulations considering them, the electric potential at the surface of the volume conductor differed on average by 2.85 %. Both platinum and twisted pair copper wires had a smaller effect on the electric potentials with a maximum average change of 6.38 ppm. Consequently, source localization of measurements in physical head phantoms should consider these rods in the forward model.

scholarly journals Novel gas sensor combined active fiber loop ring-down and dual wavelengths differential absorption method

2014 ◽  
Vol 22 (9) ◽  
pp. 11244 ◽  
Author(s):  
Yanjie Zhao ◽  
Jun Chang ◽  
Jiasheng Ni ◽  
Qingpu Wang ◽  
Tongyu Liu ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Absorption Method ◽  
Differential Absorption ◽  
Active Fiber ◽  
Loop Ring ◽  
Differential Absorption Method ◽  
Fiber Loop
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