公开(公告)号：US11029380B2

公开(公告)日：2021-06-08

申请号：US16279613

申请日：2019-02-19

Applicant: Canon Medical Systems Corporation

Inventor： Shuhei Nitta ,  Shigehide Kuhara ,  Tomoyuki Takeguchi ,  Taichiro Shiodera ,  Yukinobu Sakata

IPC: A61B5/05 ,  G06K9/36 ,  G01R33/54

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a processor and a memory. The memory stores processor-executable instructions that cause the processor to detect cross-sectional positions of a plurality of cross-sectional images to be acquired in an imaging scan from volume data; acquire the cross-sectional images in sequence based on the cross-sectional positions by executing the imaging scan; and after the first cross-sectional image is acquired in the imaging scan, generate a display image, and display the display image on a display, the display image being an image in which a cross-sectional position of a second cross-sectional image which is detected from the volume data is superimposed on the first cross-sectional image, the second cross-sectional image being a cross-sectional image before being acquired and intersecting with the first cross-sectional image.

公开(公告)号：US10969452B2

公开(公告)日：2021-04-06

申请号：US16391384

申请日：2019-04-23

Applicant: Canon Medical Systems Corporation

Inventor： Shuhei Nitta ,  Nobuyasu Ichinose ,  Hiroshi Takai ,  Naho Imamura

IPC: G01R33/483 ,  G01R33/54

Abstract: An MRI apparatus includes imaging control circuitry that performs shimming imaging for collecting a first MR signal, and multi-slice imaging for collecting a second MR signal along with radiation of a non-region-selective prepulse, and processing circuitry that generates static magnetic field distributions of the slices, determines a first center frequency of an RF pulse corresponding to each slice and a second center frequency of the prepulse based on the static magnetic field distribution, and determines an order of slices for collecting the second MR signal in accordance with the first and/or second center frequencies, wherein the imaging control circuitry performs the multi-slice imaging in accordance with the order and the first and second center frequencies.

公开(公告)号：US11035922B2

公开(公告)日：2021-06-15

申请号：US16533080

申请日：2019-08-06

Applicant: Canon Medical Systems Corporation

Inventor： Shuhei Nitta ,  Naho Imamura ,  Takahiro Ohmure ,  Hiroshi Takai ,  Nobuyasu Ichinose ,  Yoshimori Kassai

IPC: G01R33/565 ,  G01R33/561 ,  G01R33/421 ,  G01R33/56 ,  G01R33/563

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry calculates a static magnetic field correction amount based on a static magnetic field distribution of a first imaging range narrower than a second imaging range. The processing circuitry collects a magnetic resonance (MR) image of the second imaging range under a static magnetic field which is corrected based on the static magnetic field correction amount. The processing circuitry corrects distortion of the collected MR image.

公开(公告)号：US10908242B2

公开(公告)日：2021-02-02

申请号：US16391391

申请日：2019-04-23

Applicant: Canon Medical Systems Corporation

Inventor： Shuhei Nitta ,  Nobuyasu Ichinose ,  Hiroshi Takai ,  Naho Imamura

IPC: G01R33/3875 ,  G01R33/48 ,  G01R33/565 ,  G01R33/483

Abstract: A magnetic resonance imaging apparatus includes an interface, processing circuitry, and imaging control circuitry. The interface inputs, to a locator image, a position-indicating region indicating a position in a displayed cross section. The processing circuitry determines a collection direction relating to multi-slice imaging based on a static magnetic field distribution relating to the position-indicating region and the position-indicating region. The imaging control circuitry performs the multi-slice imaging in the collection direction to a plurality of slices in an imaging region which includes at least the position-indicating region.

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：US11747424B2

公开(公告)日：2023-09-05

申请号：US17684601

申请日：2022-03-02

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Kenzo Isogawa ,  Toshiyuki Ono ,  Kenichi Shimoyama ,  Nobuyuki Matsumoto ,  Shuhei Nitta ,  Satoshi Kawata ,  Toshimitsu Kaneko ,  Mai Murashima

IPC: G01R33/565 ,  G01R33/56

CPC classification number: G01R33/565 ,  G01R33/5608 ,  G01R33/56545

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes an MRI system and a processing circuitry. The MRI system includes a receiving coil to receive a magnetic resonance signal. The processing circuitry is configured to generate an image based on the magnetic resonance signal, the image including a plurality of pixels; calculate a feature value corresponding to a signal value of the pixel; correct the feature values based on a sensitivity of the receiving coil; and reduce noise in the image based on distribution of the corrected feature values.

公开(公告)号：US11112474B2

公开(公告)日：2021-09-07

申请号：US16532673

申请日：2019-08-06

Applicant: Canon Medical Systems Corporation

Inventor： Shuhei Nitta ,  Naho Imamura ,  Takahiro Ohmure ,  Hiroshi Takai ,  Nobuyasu Ichinose ,  Yoshimori Kassai

IPC: G01V3/00 ,  G01R33/48 ,  G01R33/54

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry acquires a first resonance frequency distribution of a first tissue and a second resonance frequency distribution of a second tissue which is different from the first tissue. The processing circuitry calculates a center frequency of a frequency-selective pulse that suppresses or emphasizes either one of the first tissue and the second tissue in accordance with the first and second resonance frequency distributions. The processing circuitry collects a magnetic resonance signal after the frequency-selective pulse is applied at the calculated center frequency.

公开(公告)号：US10823800B2

公开(公告)日：2020-11-03

申请号：US16411959

申请日：2019-05-14

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Shuhei Nitta ,  Tomoyuki Takeguchi ,  Yurika Ogawa ,  Kensuke Shinoda ,  Takuya Fujimaki ,  Syuhei Takemoto ,  Shigehide Kuhara

IPC: G01R33/483 ,  A61B8/00 ,  G01R33/54 ,  G16H30/20

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes processing circuitry. The processing circuitry generates a plurality of cross-sectional images for setting a sectional position to be collected in main imaging based on a characteristic portion of a target detected in three-dimensional data. The processing circuitry lists the cross-sectional images on a display and superimposes a mark corresponding to the characteristic portion on at least one of the cross-sectional images. The processing circuitry receives a setting operation to determine the sectional position. The processing circuitry causes, when the mark is selected in the setting operation, a cross-sectional image to be emphasized a sectional position of which is defined using the characteristic portion corresponding to the mark among the listed cross-sectional images. The processing circuitry performs main imaging based on the sectional position after the setting operation.

公开(公告)号：US20200033273A1

公开(公告)日：2020-01-30

申请号：US15929150

申请日：2019-10-01

Applicant: Canon Medical Systems Corporation

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

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

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：US11327031B2

公开(公告)日：2022-05-10

申请号：US15929150

申请日：2019-10-01

Applicant: Canon Medical Systems Corporation

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

IPC: G01N23/087 ,  G01T1/29 ,  G01N23/046 ,  A61B6/00 ,  A61B6/03 ,  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.