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Thermogram showing increased skin temperature over a cancerous left breast. This infrared image is colour-coded in steps of 1 degree celsius (see scale at bottom), where blue = coldest areas and yellow = hottest ones. A reference disc (right) is calibrated at 30 degrees celsius. Themography is not used as a means of screening women for breast cancer. Breast screening programs rely on X-ray mammography, an X-ray technique that reveals internal details of breast structure.
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