The core of Dynamic Angiothermography (DATG) its operating system is a plate featuring a very thin fine taut layer of a special plastic (18 x 24-cm diameter) incorporating liquid crystals. The molecular structure of the crystals enables them to refract ambient light in the red-to-violet spectrum depending on the heat detected by the plastic film when placed on the breast. The image this generates on the plate shows up as lines, a few millimeters in diameter, that represent key characteristics of the underlying blood flow. The proper interpretation of these signs results in the diagnosis. Dynamic Angiothermography, which is altogether different from any other thermographic technique, i.e. it does not measure heat but provides qualitative rather than quantitative data, has so far been tested on about more than seven thousand patients with 25 years of follow up.