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Image reconstruction not as expected | 16 electrode belt | opposition schema #98
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Hi, concerning 16 electrodes with 224 measurements, I see that your protocol is step=8 and meas=8, which means that current carrying electrodes are also been used for measurements, right? May be you could try step=8 (opposition excitation) meas=1 (adjacent measures), and drop the measures on current carrying electrodes. 16 electrodes will yield 192 total measurements, which might be stable in this setting. |
From my understanding, in step=8 and meas=8 the current carrying electrodes are not used for voltage measurement in the same set: Current Emitting | Current Absorbing | Voltage Positive | Voltage Negative this repeats for the other 15 electrode pairs: E02_E10_E01_E09 I don't see a way to manipulate the collected data to arrive at a different configuration by dropping measures. Also, I am unable to rerun the experiment. Is there a reason why 224 measurements tends to be unstable? |
First of all thanks for the project!
I collect real world data using a 16 electrode belt wrapped around the pelvic (bladder monitoring). Measurements are taken in opposition schema resulting in a DataFrame with 448 columns (224 for each Magnitude and Phase) like this:
E01_E09_E02_E10_Magnitude | E01_E09_E02_E10_Phase | E01_E09_E03_E11_Magnitude | E01_E09_E03_E11_Phase | -- | E16_E08_E14_E06_Magnitude | E16_E08_E14_E06_Phase | E16_E08_E15_E07_Magnitude | E16_E08_E15_E07_Phase
The electrodes are not spaced equally around the pelvic, but with vacancy above the pubic bone due to hardware design:
This is the code I am using for reconstruction:
Reconstruction runs through, but the results are not as expected. Even when validating the hardware on an agar-agar phantom, I found the algorithm struggling with the electrode position (results are better when assuming a equally spaced electrode arrangement, but still not as expected):
Am I missing something, or is the combination of opposition schema with custom electrode arrangement just not suitable?
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