Relationship between the gray level of X-ray photograph and the cortical thickness / 中国骨伤

ABSTRACT

<p><b>OBJECTIVE</b>In order to get three dimensional measurements simply an plain X-ray photographs.</p><p><b>METHODS</b>The multi-layers of bone pieces were made by use of bone saw, and piled up to spiral ladder, which was used as a calibrating module for to living bone in clinics. The relationship between the cortical thickness and gray level of the X-ray photographs was obtained.</p><p><b>RESULTS</b>The correlation can be described with a cubic regression curve, and it can be simplified to a linear regression equation when cortical thickness is small than 3.8 mm.</p><p><b>CONCLUSION</b>It can be realized to get three dimensional measures of the bone on plain X-ray photographs, by use of the bony spiral ladder described here.</p>