Electric tomography image system

Description

The system consist of an array of movable electrodes disposed around the torax, a low current tool to measure electric resistance and a free version software used for engineering to obtain images from resistance data. The software can be used accordingly for obtain 2d internal images of humans or animals since it calculates resistivity using data of distances between electrodes and resistance measurements.

The quality of the images obtained is dependent on the number of electrodes, the quality of measurements and the number of resistance data generated.

The electrodes are located in a xy plane.

If many data are available, the software is capable to produce 3d images.

Details

The system is oriented mainly to obtain images of the human torax cavity since the gradient of resistance is bigger there because of the air inside the lungs. It is also known that detailed images of the lungs are needed to help in the diagnosis of covid19, probably this system is more suitable for detect higher variations in electric resistivity as can be a lung partially filled with liquid.

The measurement of resistance in living beings is complex due to the presence of natural electric potentials. This is overcome using a tool capable of measure resistance neutralizing mathematically the natural electric potentials in each measurement.

Files

IMG_20200831_001039.jpg

Numbered electrodes and numbered data logger wires.

JPEG Image - 2.80 MB - 08/31/2020 at 06:26

Preview

IMG_20200831_001019.jpg

Data logger wired to numbered electrodes.

JPEG Image - 2.56 MB - 08/31/2020 at 06:25

Preview

IMG_20200830_235629.jpg

Configuration of 5 voltage electrodes on data logger.

JPEG Image - 2.86 MB - 08/31/2020 at 06:23

Preview

IMG_20200830_235727.jpg

Test of natural DC voltage with 5 electrodes from forearm.

JPEG Image - 3.04 MB - 08/31/2020 at 06:06

Preview

Components

32 × Stainless Steel electrodes

1 × Electrodes board

Project Logs

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Testing current on skin
pedro velez • 08/30/2020 at 07:10 • 0 comments

Testing with low voltage AC using a 15 hz oscillator.
I split the plywood board and wired electrodes to a data logger
pedro velez • 08/30/2020 at 06:28 • 0 comments

I split the plywood board to make easier to accommodate a person chest (me) 👍 and wired electrodes to a data logger. I need to store voltage measurements using at least 12 electrodes as sense electrodes. Other part of electrodes should be used as current electrodes (input)
Updated to 36 electrodes
pedro velez • 08/30/2020 at 05:46 • 0 comments

I added more electrodes considering the chest and electrodes size.
First 18 Stainless Steel electrodes and plywood board.
pedro velez • 08/30/2020 at 05:44 • 0 comments

First step. 18 Stainless Steel electrodes and plywood board.

View all 4 project logs

Discussions

pedro velez wrote 06/07/2020 at 23:39

Thanks for your question.

I has been working with other applications of electric impedance tomography since 2005.

I will post some pictures tomorrow of the circular base sustaining electrodes.

May be this can help you to understand some principles of the method, it mainly uses the ohm law.

en.m.wikipedia.org/wiki/Electrical_resistivity_measurement_of_concrete

https://en.m.wikipedia.org/wiki/Electrical_Impedance_and_Diffuse_Optical_Tomography_Reconstruction_Software

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Electric tomography image system

Description

Details