公开(公告)号：US20220187402A1

公开(公告)日：2022-06-16

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

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：US20190324106A1

公开(公告)日：2019-10-24

申请号：US16386754

申请日：2019-04-17

Applicant: Canon Medical Systems Corporation

Inventor： Tomoya TSURUYAMA ,  Shuhei NITTA ,  Tomoyuki TAKEGUCHI

IPC: G01R33/565 ,  G01R33/58 ,  G01R33/56

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry estimates transmission inhomogeneity caused in a transmit RF magnetic field from a first image based on a first signal received by a whole-body coil, and estimates reception inhomogeneity caused in a receive RF magnetic field from the first image and a second image based on a second signal received by a surface coil. The processing circuitry generates a third image, having a resolution higher than a resolution of the first image and a resolution of the second image, based on a third signal received by the surface coil. The processing circuitry corrects the third image by using the estimated transmission inhomogeneity and reception inhomogeneity.

公开(公告)号：US20190287674A1

公开(公告)日：2019-09-19

申请号：US16429771

申请日：2019-06-03

Applicant: Canon Medical Systems Corporation

Inventor： Shuhei NITTA ,  Hidenori TAKESHIMA

IPC: G16H30/40 ,  G06T7/00 ,  G01R33/48 ,  G01R33/54

Abstract: According to one embodiment, a medical signal processing apparatus includes processing circuitry. The processing circuitry inputs a medical signal to a learned model configured to output one of the following: a corrected signal that is corrected so as to reduce a pattern of the medical signal, the pattern appearing at a location shifted by a known shift amount in a known direction; pattern-related information relating to the pattern; or disease information relating to the medical signal. The processing circuitry outputs, by using the direction and the shift amount, one of the corrected signal, the pattern-related information, or the disease information.

公开(公告)号：US20200041600A1

公开(公告)日：2020-02-06

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 ,  G01R33/563 ,  G01R33/56 ,  G01R33/421

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 the MR image.

公开(公告)号：US20200041593A1

公开(公告)日：2020-02-06

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: 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：US20190265320A1

公开(公告)日：2019-08-29

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

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：US20190187232A1

公开(公告)日：2019-06-20

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: G01R33/54

CPC classification number: G01R33/546

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.