US 11,998,382 B2
Utensil for evaluating length measurement error in X-ray CT device for three-dimensional shape measurement
Taketo Kishi, Kyoto (JP); Makoto Sato, Kyoto (JP); Toshiyuki Takatsuji, Ibaraki (JP); Makoto Abe, Ibaraki (JP); and Hiroyuki Fujimoto, Kyoto-shi (JP)
Assigned to Shimadzu Corporation, Kyoto (JP); and NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Tokyo (JP)
Filed by Shimadzu Corporation, Kyoto (JP); and NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Tokyo (JP)
Filed on Feb. 23, 2022, as Appl. No. 17/678,726.
Application 17/678,726 is a continuation of application No. 16/485,639, granted, now 11,291,425, previously published as PCT/JP2018/012546, filed on Mar. 27, 2018.
Claims priority of application No. 2017-084774 (JP), filed on Apr. 21, 2017.
Prior Publication US 2022/0175337 A1, Jun. 9, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 6/58 (2024.01); A61B 6/03 (2006.01); A61B 90/00 (2016.01)
CPC A61B 6/583 (2013.01) [A61B 6/032 (2013.01); A61B 90/06 (2016.02); A61B 2090/061 (2016.02)] 4 Claims
OG exemplary drawing
 
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.