A process of performing a medical test includes taking multi-spectral images of an area of interest of a patient. The patient can be a human being or an animal, and can be known to be healthy or known to have health issues or problems. A multi-spectral camera includes a long-infrared charge-coupled device, a mid-infrared detector array, and a control device that synchronizes operation of the charge-coupled device and the detector array. The mid-infrared detector array can include carbon nanotubes. The carbon nanotubes can be detector elements. For example, the carbon nanotubes can be tuned-bandgap carbon nanotubes. Each pixel of resolution of the detector array can include a balanced Wheatstone bridge circuit including one of the tuned-bandgap carbon nanotubes. Adjacent pixels of the detector array can be arranged for orthogonal polarization.
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