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eitcom / pyEIT

Python based toolkit for Electrical Impedance Tomography
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About the units of the displayed colourbars #105

Open ps4nch3z opened 1 month ago

ps4nch3z commented 1 month ago

Hi,

I hope this message finds you well.

First, I want to express my appreciation for the excellent work done on pyEIT. It has been incredibly helpful for my work with electrical impedance tomography.

I have a question regarding the color scale in the images generated. When using the provided codes, I get an image that maps the conductivities in a region, along with a colourbar displaying a gradient of colors (e.g., from black to white through various shades of gray). Each color in this gradient represents a specific value. Could you please clarify what units these values on the color scale are in?

Thank you very much for your assistance and for this valuable tool.

Best regards,

Pablo Sánchez

liubenyuan commented 1 month ago

Hi, in dynamic EIT, a pixel in the image represents a relative change in conductivity (or impedance), which do not have a specific unit unless the impedance distribution at R0 is known a prior (even if R0 is known, there is still calibration procedure needed).