Radiography. Two female doctors examining two X-ray images of a human skull on a single sheet. The internal bone structure of the patient's face is visible; teeth fillings show up bright white. Radiography is an important diagnostic technique for locating bone fractures. This radiograph is like a photographic 'negative'- the light areas represent an absence of X-rays. X- rays are high energy electromagnetic waves. They are able to penetrate soft tissue but are absorbed by the heavier atoms in bone.
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