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. 2011 Nov 29;23(8):2219–2226. doi: 10.1007/s00198-011-1854-0

Fig. 1.

Fig. 1

Principles of digital x-ray radiogrammetry. Using a standard x-ray, the region of interest is automatically detected. From the density curve (right), the external and internal diameters are detected (117 lines/cm). The reported bone width (W), cortical thickness (T) and endosteal diameter are the averages of these measurements. Coefficient of variation (CV) 0.65%