Abstract
Each specimen was sawn into 2-mm transverse or sagittal parallel sections. Contact X-ray films were made from these sections using a mammography apparatus with molybdenum tubes and filtering at 17 keV. The radiographs were standardized using an aluminum-alloy calibration wedge placed on each film, adjacent to the bone sections to be evaluated. These X-rays were then read through a camera system into an IBAS 2000 Zeiss computer, which, with the aid of a digital-image processor, subdivided the continuous gray value distribution of the film into discrete regions, each with its gray value (Schleicher et al. 1980). In order to grade the bone absorption into five steps, the region of optical density between the unattenuated radiation and the radiation attenuated by an aluminum step of 1.2 mm was divided up at equal intervals. By allotting a color to each gray region, a contour map was produced, in which areas of equal density were given the same color.
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© 1998 Springer-Verlag Berlin Heidelberg
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Müller-Gerbl, M. (1998). Methods. In: The Subchondral Bone Plate. Advances in Anatomy Embryology and Cell Biology, vol 141. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-72019-2_3
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DOI: https://doi.org/10.1007/978-3-642-72019-2_3
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-63673-1
Online ISBN: 978-3-642-72019-2
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