Electric tomography image system

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) 

I added more electrodes considering the chest and electrodes size.

First step. 18 Stainless Steel electrodes and plywood board.