| 摘要 |
A method to estimate the amount of cortical bone in an individual, particularly well suited to children of different sizes. An X-ray image is obtained in digital form, using conventional film or a digital X-ray imaging device. A computer analyses the image to locate the bone shaft, and the bone width W and the cortical thickness T are determined from the image . The bone length L is obtained from the image or from manual measurement. PBI = A / (LW), with A = p T W (1 - T/W), is the estimate of the amount of bone. For groups of normal children of the same age and sex, PBI has the distinctive advantage of a small standard deviation relative to the mean value.
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