CPC A61B 6/583 (2013.01) [A61B 6/032 (2013.01); A61B 90/06 (2016.02); A61B 2090/061 (2016.02)] | 4 Claims |
1. A utensil for evaluating a length measurement error in an X-ray CT device for three-dimensional shape measurement, which utensil is positioned for use on a rotation stage of the X-ray CT device for three-dimensional shape measurement such that a Z axis as a rotation axis of the rotation stage coincides with a center of a cylindrical imaging space, the utensil comprising:
a base; and
multiple spheres arranged in an XYZ space on the base corresponding to the imaging space, wherein:
the multiple spheres include an outer circumference side sphere arranged on one outer circumferential circle around the Z axis in each of multiple X-Y planes having different Z positions;
a radius of an outer circumferential circle on which the outer circumference side sphere is arranged in each of the multiple X-Y planes is same and coordinates (X, Y) of an outer circumference side sphere arranged in all of the multiple X-Y planes are different; and
multiple outer circumference side spheres include two sets of two spheres symmetrically arranged with respect to the Z axis.
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