ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY
Infrared transillumination image showing fibrocystic female breasts. The cysts appear as the dark spots on the image. Since the various types of breast tissue absorb and transmit infrared light in different ways, the internal structure of the breast can be examined by transillumination. Computer analysis of the wavelengths of light absorbed and transmitted produces these images.
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