公开(公告)号：US20190223826A1

公开(公告)日：2019-07-25

申请号：US16250201

申请日：2019-01-17

Applicant: MITUTOYO CORPORATION

Inventor： Hidemitsu ASANO ,  Masato KON

IPC: A61B6/00 ,  A61B6/03 ,  G01T7/00 ,  G01N23/046

Abstract: An X-ray CT measuring apparatus configured to emit an X-ray from an X-ray source while rotating a subject arranged on a rotary table, and obtain a tomographic image of the subject by reconstructing projection images, includes an X-ray fluctuation calibration jig arranged in an X-ray field of view, a detection unit configured to detect fluctuations in an X-ray focal position by using an X-ray projected image of the X-ray fluctuation calibration jig, and a correction unit configured to correct an X-ray projection image of the subject by using the detected fluctuations in the X-ray focal position.

公开(公告)号：US20210404976A1

公开(公告)日：2021-12-30

申请号：US17360304

申请日：2021-06-28

Applicant: MITUTOYO CORPORATION

Inventor： Masato KON ,  Hiromu MAIE ,  Seiji SASAKI ,  Jyota MIYAKURA

IPC: G01N23/083 ,  G01N23/18

Abstract: A calibration method for an X-ray measuring device includes mounting a calibration tool on a rotating table, identifying centroid positions from an output of an X-ray image detector, calculating projection transformation matrixes from the centroid positions and known relative positional intervals, repeating to identify the centroid positions from the output of the X-ray image detector and to calculate the projection transformation matrixes from the centroid positions and known relative positional intervals while the rotating table is rotated twice or more by a predetermined angle, and calculating a rotation center position of the rotating table on the basis of the projection transformation matrixes. The calibration method thereby allows easy calculation of the rotation center position of the rotating table on which an object to be measured is mounted in a rotatable manner, with the simple process.

公开(公告)号：US20200013200A1

公开(公告)日：2020-01-09

申请号：US16455912

申请日：2019-06-28

Applicant: THE UNIVERSITY OF TOKYO ,  MITUTOYO CORPORATION

Inventor： Yutaka OHTAKE ,  Tomonori GOTO ,  Masato KON

IPC: G06T11/00 ,  G06T3/40

Abstract: Projection images of reduced resolution are generated by reducing resolution of filtered projection images and/or reducing the number of filtered projection images. Volume data of reduced resolution is generated by performing CT reconstruction using the projection images of reduced resolution. Each voxel of the volume data of reduced resolution is provisionally divided. The provisionally divided voxels are compared in voxel value before and after provisional division. If a difference in voxel value before and after the provisional division is greater than a threshold, the provisional division is determined to be valid, and division is further continued. If the difference in voxel value before and after the provisional division is less than or equal to the threshold, the provisional division is determined to be invalid and the voxel ends being divided.

公开(公告)号：US20190274654A1

公开(公告)日：2019-09-12

申请号：US16291674

申请日：2019-03-04

Applicant: MITUTOYO CORPORATION

Inventor： Sadayuki MATSUMIYA ,  Hidemitsu ASANO ,  Masato KON

IPC: A61B6/00 ,  A61B6/03 ,  G06T11/00 ,  G01N23/046

Abstract: When generating a tomographic image using a measuring X-ray CT apparatus that is configured to emit X-rays while rotating a specimen that is arranged on a rotary table and reconstruct a projection image thereof to generate a tomographic image of the specimen, an amount of geometric error that is included in the projection image is obtained in advance and stored; the projection image is corrected using the stored amount of geometric error; and a tomographic image is reconstructed using the corrected projection image.

公开(公告)号：US20190255776A1

公开(公告)日：2019-08-22

申请号：US16402669

申请日：2019-05-03

Applicant: MITUTOYO CORPORATION

Inventor： Gyokubu CHO ,  Hidemitsu ASANO ,  Masato KON

IPC: B29C64/386 ,  B29C64/106

Abstract: A 3D printer includes: an object-forming unit for forming an object by laminating an object material at an object-forming point based on a design data; an image capturing unit for capturing an image of the object formed by the object-forming unit; and a shape measurement unit for measuring a cross section of the object based on the image captured by the image capturing unit while the object is under formation by the object-forming unit.