30.7 MB (2.3 MB compressed)
3994 x 2686 pixels
33.8 x 22.9 cm ⏐ 13.3 x 9.0 in (300dpi)
CATHERINE URSILLO / SCIENCE PHOTO LIBRARY CATHERINE URSILLO / SCIENCE PHOTO LIBRARY
Osteoporosis. Computer screen showing the result of a dual photon bone densitometry scan of the hip joint of a patient with osteoporosis. This technique is used to measure the mineral density of bone, which declines in osteoporosis. The image on the left shows the direction of the scan through the neck of the femur (thigh bone). Bone is defined as osteoporotic when its density is less than 0.8g/cm2. In this patient the value is 0.71g/cm2 (lower right), 72% of that of an average young adult and 83% of the average for the patient's age. The graph shows the average age at which bone density has fallen to the level observed in this patient.
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