scholarly journals Feasibility of electrical impedance tomography in haemorrhagic stroke treatment using adaptive mesh

2010 ◽  
Vol 224 ◽  
pp. 012065 ◽  
Author(s):  
J Nasehi Tehrani ◽  
C Anderson ◽  
C Jin ◽  
A van Schaik ◽  
D Holder ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Adaptive Mesh ◽  
Haemorrhagic Stroke ◽  
Impedance Tomography ◽  
Stroke Treatment

scholarly journals Self-Abrading Servo Electrode Helmet for Electrical Impedance Tomography

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7058
Author(s):  
James Avery ◽  
Brett Packham ◽  
Hwan Koo ◽  
Ben Hanson ◽  
David Holder
Keyword(s):  
Acute Stroke ◽  
Electrical Impedance Tomography ◽  
Large Scale ◽  
Electrical Impedance ◽  
Applied Pressure ◽  
High Sensitivity ◽  
Haemorrhagic Stroke ◽  
Contact Impedance ◽  
Impedance Tomography ◽  
Skin Contact

Electrical Impedance Tomography (EIT) is a medical imaging technique which has the potential to reduce time to treatment in acute stroke by rapidly differentiating between ischaemic and haemorrhagic stroke. The potential of these methods has been demonstrated in simulation and phantoms, it has not yet successfully translated to clinical studies, due to high sensitivity to errors in scalp electrode mislocation and poor electrode-skin contact. To overcome these limitations, a novel electrode helmet was designed, bearing 32 independently controlled self-abrading electrodes. The contact impedance was reduced through rotation on an abrasive electrode on the scalp using a combined impedance, rotation and position feedback loop. Potentiometers within each unit measure the electrode tip displacement within 0.1 mm from the rigid helmet body. Characterisation experiments on a large-scale test rig demonstrated that approximately 20 kPa applied pressure and 5 rotations was necessary to achieve the target 5 kΩ contact impedance at 20 Hz. This performance was then replicated in a simplified self-contained unit where spring loaded electrodes are rotated by servo motors. Finally, a 32-channel helmet and controller which sequentially minimised contact impedance and simultaneously located each electrode was built which reduced the electrode application and localisation time to less than five minutes. The results demonstrated the potential of this approach to rapidly apply electrodes in an acute setting, removing a significant barrier for imaging acute stroke with EIT.

CALIBRATION OF A LOW COST ELECTRICAL IMPEDANCE TOMOGRAPHY SYSTEM WITH A RING OF RESISTORS AND A KCL SOLUTION

2019 ◽  
Author(s):  
Bruno Furtado de Moura ◽  
francisco sepulveda ◽  
Jorge Luis Jorge Acevedo ◽  
Wellington Betencurte da Silva ◽  
Rogerio Ramos ◽  
...  
Keyword(s):  
Electrical Impedance Tomography ◽  
Electrical Impedance ◽  
Low Cost ◽  
Impedance Tomography ◽  
Tomography System
Sign in / Sign up

Export Citation Format

Share Document