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STL model generation algorithms provided in two software products (Mimics 18.0 and OsiriX [Pixmeo SARL, Bernex, Switzerland]). With both software products, axial CT images were loaded and identically segmented (yellow, lower left image) by using an attenuation threshold of 226 HU. The resulting STL models generated by using the default settings for each software differed by 0.73 mm for the external bone surface measurement and by 1.13 mm for the internal surface measurement.
