公开(公告)号：US10959684B2

公开(公告)日：2021-03-30

申请号：US15902508

申请日：2018-02-22

Applicant: Canon Medical Systems Corporation

Inventor： Hiroaki Nakai ,  Emi Tamura ,  Hiroaki Miyazaki ,  Mikihito Hayashi ,  Tooru Kato ,  Naoki Sugihara

IPC: A61B6/03 ,  G01T1/17 ,  G01T1/20 ,  A61B6/00 ,  G01T1/29 ,  A61B6/04

Abstract: According to one embodiment, an X-ray computed tomography apparatus includes an X-ray tube and an X-ray detector. The X-ray tube generates X-rays. The X-ray detector includes a first detection area detecting the X-rays and a second detection area detecting the X-rays. The first detection area includes a first scintillator having a first fluorescence decay time, the second detection area includes a second scintillator having a second fluorescence decay time shorter than the first fluorescence decay time. The second detection area is arranged at both ends of the first detection area with respect to a channel direction.

公开(公告)号：US10769822B2

公开(公告)日：2020-09-08

申请号：US15951693

申请日：2018-04-12

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Emi Tamura ,  Hiroaki Nakai

IPC: G06K9/00 ,  G06T11/00 ,  G01T1/29 ,  A61B6/00 ,  A61B6/03 ,  G06T5/50 ,  G06T7/00

Abstract: An X-ray CT apparatus according to an embodiment includes a photon counting detector, and processing circuitry. The photon counting detector includes a plurality of detecting elements each of which outputs signals corresponding to numbers of photons that are counted. The processing circuitry generates pieces of first projection data on a basis of the signals from the plurality of detecting elements. The processing circuitry generate second projection data by bundling together, in spatial units, pieces of first projection data from a predetermined number of detecting elements among the plurality of detecting elements. The processing circuitry reconstructs a material decomposition image on a basis of the second projection data.

公开(公告)号：US10451568B2

公开(公告)日：2019-10-22

申请号：US14832332

申请日：2015-08-21

Applicant: Canon Medical Systems Corporation

Inventor： Kenta Moriyasu ,  Taichiro Shiodera ,  Shuhei Nitta ,  Tomoyuki Takeguchi ,  Hidenori Takeshima ,  Toshiyuki Ono ,  Takashi Ida ,  Hiroaki Nakai

IPC: G01N23/04 ,  G01N23/087 ,  G01T1/17 ,  G01T1/29 ,  G01N23/046 ,  A61B6/03 ,  A61B6/00 ,  A61B6/06

Abstract: A photon counting X-ray CT apparatus according to an embodiment includes: data acquiring circuitry, and processing circuitry. The data acquiring circuitry is configured to allocate energy measured by signals output from a photon counting detector in response to incidence of X-ray photons to any of a plurality of first energy bins so as to acquire a first data group as count data of each of the first energy bins. The processing circuitry is configured to determine a plurality of second energy bins obtained by grouping the first energy bins in accordance with a decomposition target material that is a material to be decomposed in a imaging region, allocate the first data group to any of the second energy bins so as to generate a second data group, and use the second data group to generate an image representing a distribution of the decomposition target material.

公开(公告)号：US20190021687A1

公开(公告)日：2019-01-24

申请号：US16041224

申请日：2018-07-20

Applicant: Canon Medical Systems Corporation

Inventor： Tooru KATO ,  Hiroaki Miyazaki ,  Emi Tamura ,  Hiroaki Nakai

IPC: A61B6/00 ,  A61B6/03

CPC classification number: A61B6/4488 ,  A61B6/032 ,  A61B6/035 ,  A61B6/06 ,  A61B6/4035 ,  A61B6/4233 ,  A61B6/4241 ,  A61B6/5205 ,  A61B6/54

Abstract: An X-ray CT apparatus according to an embodiment includes a photon counting detector and processing circuitry. The photon counting detector includes a plurality of detection areas arranged in a channel direction and a column direction and is configured to output detection signals corresponding to the quantity of photons incident thereto, the detection areas each including a plurality of detecting elements. The processing circuitry is configured to calculate a heat generation amount for each of the detection areas on the basis of the detection signal corresponding to the incident photons detected in the detection area, to determine a control amount on the basis of the heat generation amount calculated for each of the detection areas, and to control temperature in each of the detection areas by using the determined control amount.