by Mindseye Biomedical

Open Source Biomedical Imaging

View all updates May 10, 2019

Cooked vs Uncooked Food

Today, we are going to look at bioimpedance spectroscopy (mode 2 of Spectra system), where we obtain a dielectric spectrum by injecting a frequency sweep over a conductive object. Using this technique we will see if we can detect the difference between cooked and uncooked food!

To begin, we obtain one carrot and one chicken breast and take a bioimpedance spectrum measurement while it’s raw. We make sure to mark where we placed the electrodes so we can repeat the exact same measurement once it’s cooked. We then pop it in the microwave for two minutes, and take a second measurement. Can we see the difference?

The Results

Woo! It looks like there is a clearly discernible difference between cooked and uncooked spectrums. More than that, carrots and chickens have clearly discernable spectrums too. Other similar ideas include the ripeness of fruit, or the detection of cervical cancer using exactly the same technique!

If you want a detailed tutorial on how to do this with your Spectra - check out the tutorials in the documentation section of our site.

Almost There!

Thanks again if you’ve already supported the Spectra campaign. If you haven’t yet, now is a great time to do so - we’re nearing the end of the campaign and would love to push through the goal and make these fascinating techniques more accessible. Thank you for your support!

Learn More on the Main Spectra Campaign Page

$43,962 raised

of $30,000 goal

146% Funded!
Not Available
May 16 2019
funded on

Product Choices


Spectra Starter Kit

This kit has everything you need to get started experimenting with biomedical imaging, including a small tank phantom, 32-channel flex electrode array, USB cable, and fully assembled, flashed, and tested Spectra board that works with easy-to-install open source host software.


Spectra Deluxe Kit

The whole deal, ready to go. You get everything in the Spectra Starter Kit, plus a custom portable enclosure, an electrode expansion adapter, and a 32-channel, gold-plated electrode cable for performing EIT scans on almost anything, anywhere!


Expansion Kit

This kit includes an electrode expansion adapter and a 32-channel, gold-plated electrode cable (the same as those included in the Spectra Deluxe Kit). The expansion adapter lets you patch out to a standard 0.1" header so you can connect it anyway you want to anything you want. The 32-electrode cable allows you to stick the device on a variety of conductive objects of different sizes as each electrode is independent, gold-plated, and protected by an insulated injection molded cover. The expansion kit gives you the flexibility you need for nearly any experiment.


Mindseye Biomedical

Mindseye Biomedical creates new tools in non-invasive biomedical imaging and neuroscience and offers engineering consulting services. Working toward the democratization of biomedical imaging through an open source ideology.

Jean Rintoul


Contract manufacturer

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