The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 17, 1991
Filed:
May. 28, 1991
Masahiro Ozaki, Ootawara, JP;
Toshihiro Rifu, Nishinasunomachi, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A patient platform of a gantry assembly is inserted into a scanning space of a housing dome. Within the dome around the space is provided an array of X-ray detectors arranged circumferentially. An X-ray tube is rotatably disposed outside the array. When the subject on the patient platform is inserted into the space, the X-ray tube irradiates X-rays in a fan shape toward the object. The X-ray detector array performs a nutation movement during the rotation of the X-ray tube so that the X-ray detectors on the X-ray irradiation path which is closer to the X-ray tube is outside the X-ray irradiation path. In this way, the object is continuously scanned in a helical manner with X-rays. The output of the detector array is supplied to an interpolation circuit. The interpolation circuit performs pre-processing on the output of the X-ray detector array, thereby providing projection data. The interpolation circuit interpolates to calculate desired projection data for a predetermined slice having a given projection angle by processing projection data for two slices located on both sides of the predetermined slice having the given projection angle and by processing the distances between the two slices and the predetermined slice.