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公开(公告)号：US20230012501A1
公开(公告)日：2023-01-19
申请号：US17305677
申请日：2021-07-13
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Mitsue MIYAZAKI , Yoshimori KASSAI
IPC: G01R33/54 , G01R33/563
Abstract: A magnetic resonance imaging apparatus according to an embodiment includes sequence controlling circuitry and processing circuitry. The sequence controlling circuitry is configured to execute (i) a first pulse sequence in which a spatially selective Inversion recovery (IR) pulse and a spatially non-selective IR pulse are applied, and subsequently an acquisition is performed and (ii) a second pulse sequence in which the spatially non-selective IR pulse is applied without applying the spatially selective IR pulse, and subsequently an acquisition is performed, while varying the first TI period, with respect to a plurality of first TI periods. The processing circuitry is configured to calculate a second TI period to be used in a third pulse sequence and a fourth pulse sequence, based on data obtained from the first pulse sequence and the second pulse sequence. The sequence controlling circuitry executes (iii) the third pulse sequence in which the spatially selective IR pulse and the spatially non-selective IR pulse are applied, and subsequently an acquisition is performed and (iv) the fourth pulse sequence in which the spatially non-selective IR pulse is applied without applying the spatially selective IR pulse, and subsequently an acquisition is performed. The processing circuitry generates a magnetic resonance image of an imaged region based on data obtained from the third pulse sequence and the fourth pulse sequence.
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公开(公告)号：US20230152402A1
公开(公告)日：2023-05-18
申请号：US18153412
申请日：2023-01-12
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Mitsue MIYAZAKI , Yoshimori KASSAI
IPC: G01R33/54 , G01R33/563
CPC classification number: G01R33/543 , G01R33/5635 , G01R33/4818
Abstract: A magnetic resonance imaging apparatus includes sequence controlling circuitry and processing circuitry. The sequence controlling circuitry executes (i) a first pulse sequence in which a spatially selective Inversion recovery (IR) pulse and a spatially non-selective IR pulse are applied, and (ii) a second pulse sequence in which the spatially non-selective IR pulse is applied without applying the spatially selective IR pulse, while varying the first TI period, with respect to a plurality of first TI periods. The sequence controlling circuitry executes (iii) the third pulse sequence in which the spatially selective IR pulse and the spatially non- selective IR pulse are applied, and (iv) the fourth pulse sequence in which the spatially non-selective IR pulse is applied without applying the spatially selective IR pulse. The processing circuitry generates a magnetic resonance image of an imaged region based on data obtained from the third pulse sequence and the fourth pulse sequence.
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公开(公告)号：US20220084202A1
公开(公告)日：2022-03-17
申请号：US17473307
申请日：2021-09-13
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Yutaka HOSHIYAMA , Yoshimori KASSAI , Yuto ONO , Junichiro ARAOKA , Kazuya TANOUE , Hidetaka KONTA
Abstract: An information processing apparatus according to an embodiment includes processing circuitry. The processing circuitry is configured to perform an image generating process of generating a plurality of medical images on the basis of a plurality of imaging parameter groups, the plurality of imaging parameter groups being updated by adversarial learning. The processing circuitry is configured to perform a discriminating process of discriminating whether or not each of the plurality of medical images is a target image acquired by a first medical imaging apparatus in the adversarial learning. The processing circuitry is configured to output one of the imaging parameter groups used for generating the medical images in the image generating process when the adversarial learning has converged.
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公开(公告)号：US20230248256A1
公开(公告)日：2023-08-10
申请号：US18166061
申请日：2023-02-08
Inventor： Mitsue MIYAZAKI , Won BAE , Vadim MALIS , Yoshimori KASSAI
CPC classification number: A61B5/055 , A61B5/0042
Abstract: In one embodiment, an MRI apparatus includes: a scanner that includes a static magnetic field magnet, a gradient coil, and a WB coil; and processing circuitry. The processing circuitry is configured to: cause the scanner to image, under a first imaging method, a tissue including a perfusion route of body fluid that removes waste products of the object the body fluid including neurofluid; generate an anatomical image of the tissue from first data acquired by imaging under the first imaging method; cause the scanner to image perfusion behavior of the body fluid in real time under a second imaging method using non-contrast perfusion imaging; generate a perfusion image indicating the perfusion behavior of the body fluid from second data acquired by imaging under the second imaging method; and generate a fused image by combining the anatomical image and the perfusion image.
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Patent Agency Ranking
公开(公告)号：US20230003817A1
公开(公告)日：2023-01-05
申请号：US17305257
申请日：2021-07-02
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Mitsue MIYAZAKI , Yoshimori KASSAI
IPC: G01R33/54 , G01R33/567 , G01R33/48
Abstract: In one embodiment, a magnetic resonance imaging apparatus includes: a scanner that includes a static magnetic field magnet configured to generate a static magnetic field, a gradient coil configured to generate a gradient magnetic field, and a WB (Whole Body) coil configured to apply an RF pulse to an object; and processing circuitry. The processing circuitry is configured to: set (i) a pulse sequence in which a sequence element is repeated, the sequence element including at least an inversion pulse and (ii) a data acquisition sequence executed after a delay time from the inversion pulse; and cause the scanner to execute the pulse sequence by using virtual gating.
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公开(公告)号：US20210255265A1
公开(公告)日：2021-08-19
申请号：US16790792
申请日：2020-02-14
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Mitsue MIYAZAKI , Yoshimori KASSAI
Abstract: A magnetic resonance imaging apparatus according to an embodiment includes sequence controlling circuitry and processing circuitry. The sequence controlling circuit executes, while a k-space is divided into a plurality of segments, a pulse sequence by which a tag pulse is applied and subsequently acquisition is performed. The processing circuit generates an image based on the pulse sequence executed by the sequence controlling circuit. The pulse sequence is a pulse sequence by which the acquisition is repeatedly performed at the center of the k-space. The sequence controlling circuit executes the pulse sequence, while changing the range to which the tag pulse is applied, for each of the plurality of segments.
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公开(公告)号：US20220236354A1
公开(公告)日：2022-07-28
申请号：US17643536
申请日：2021-12-09
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Yoshimori KASSAI , Masao YUI
Abstract: A magnetic resonance imaging apparatus according to an embodiment includes processing circuitry. The processing circuitry acquires an echo signal generated for each of intervals of repetition time by applying an excitation pulse to a subject at the intervals of repetition time, and acquires data of a plurality of trajectories set for a k-space using the echo signals. The processing circuitry acquires a plurality of echo signals by setting echo time to lengths different between a plurality of periods of repetition time and acquires data of the same trajectory using the echo signals, and the echo time serves as time from application of the excitation pulse to generation of the echo signal.
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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.
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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
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.
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