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1. 发明授权

US11313932B2 Magnetic resonance imaging apparatus and magnetic resonance imaging method 有权
公开(公告)号：US11313932B2
公开(公告)日：2022-04-26
申请号：US16790792
申请日：2020-02-14
申请人： CANON MEDICAL SYSTEMS CORPORATION
发明人： Mitsue Miyazaki , Yoshimori Kassai
IPC分类号： G01R33/54 , A61B5/055 , G01R33/48
摘要： 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.

2. 发明授权

US10955510B2 Magnetic resonance imaging apparatus 有权
公开(公告)号：US10955510B2
公开(公告)日：2021-03-23
申请号：US16569316
申请日：2019-09-12
申请人： Canon Medical Systems Corporation
发明人： Kensuke Shinoda , Yoshimori Kassai , Yoshiteru Watanabe
IPC分类号： G01R33/565 , G01R33/483 , G01R33/46 , G01R33/32
摘要： According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry generates, from a first image influenced by a magnetic field distortion, a second image in which the influence of the distortion is corrected, receives a first area setting in the second image and calculates, by a method of the calculation depending on an imaging purpose, an excitation area in the imaging based on the first area.

3. 发明授权

US11619693B2 Magnetic resonance imaging apparatus 有权
公开(公告)号：US11619693B2
公开(公告)日：2023-04-04
申请号：US17643536
申请日：2021-12-09
申请人： CANON MEDICAL SYSTEMS CORPORATION
发明人： Yoshimori Kassai , Masao Yui
IPC分类号： G01R33/48 , G01R33/50
摘要： 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.

4. 发明授权

US11598834B2 Magnetic resonance imaging apparatus 有权
公开(公告)号：US11598834B2
公开(公告)日：2023-03-07
申请号：US17305257
申请日：2021-07-02
申请人： CANON MEDICAL SYSTEMS CORPORATION
发明人： Mitsue Miyazaki , Yoshimori Kassai
IPC分类号： G01V3/00 , G01R33/54 , G01R33/48 , G01R33/567
摘要： 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.

5. 发明授权

US11035922B2 Magnetic resonance imaging apparatus and magnetic resonance imaging method for correcting distortion of a collected magnetic resonance image 有权
公开(公告)号：US11035922B2
公开(公告)日：2021-06-15
申请号：US16533080
申请日：2019-08-06
申请人： Canon Medical Systems Corporation
发明人： Shuhei Nitta , Naho Imamura , Takahiro Ohmure , Hiroshi Takai , Nobuyasu Ichinose , Yoshimori Kassai
IPC分类号： G01R33/565 , G01R33/561 , G01R33/421 , G01R33/56 , G01R33/563
摘要： 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.

6. 发明申请

US20190146044A1 MAGNETIC RESONANCE IMAGING APPARATUS 审中-公开
公开(公告)号：US20190146044A1
公开(公告)日：2019-05-16
申请号：US16191927
申请日：2018-11-15
申请人： Canon Medical Systems Corporation
发明人： Takaya Mori , Keiichiro Ishi , Yoshimori Kassai , Sho Tanaka
IPC分类号： G01R33/24 , G01R33/385 , G06T7/00 , A61B5/055
摘要： According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry calculates power of a first RF magnetic field required for excitation at a first flip angle in a first target slice, acquires information on inhomogeneity of a transmission RF magnetic field for a cross section crossing the first target slice, and calculate power of a second RF magnetic field required for excitation at a second flip angle in a second target slice different from the first target slice for the cross section by using the information and the first RF magnetic field power.

7. 发明授权

US11249154B2 Magnetic resonance imaging apparatus 有权
公开(公告)号：US11249154B2
公开(公告)日：2022-02-15
申请号：US16191927
申请日：2018-11-15
申请人： Canon Medical Systems Corporation
发明人： Takaya Mori , Keiichiro Ishi , Yoshimori Kassai , Sho Tanaka
IPC分类号： G01R33/24 , G01R33/385 , A61B5/055 , G06T7/00 , G01R33/565 , G01R33/54 , G01R33/483 , G01R33/58
摘要： According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry calculates power of a first RF magnetic field required for excitation at a first flip angle in a first target slice, acquires information on inhomogeneity of a transmission RF magnetic field for a cross section crossing the first target slice, and calculate power of a second RF magnetic field required for excitation at a second flip angle in a second target slice different from the first target slice for the cross section by using the information and the first RF magnetic field power.

8. 发明授权

US11112474B2 Magnetic resonance imaging apparatus and magnetic resonance imaging method 有权
公开(公告)号：US11112474B2
公开(公告)日：2021-09-07
申请号：US16532673
申请日：2019-08-06
申请人： Canon Medical Systems Corporation
发明人： Shuhei Nitta , Naho Imamura , Takahiro Ohmure , Hiroshi Takai , Nobuyasu Ichinose , Yoshimori Kassai
IPC分类号： G01V3/00 , G01R33/48 , G01R33/54
摘要： 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.

9. 发明授权

US10976397B2 MRI apparatus utilizing non-ultrashort TE(UTE) imaging to generate a mask image for performance of mask processing 有权
公开(公告)号：US10976397B2
公开(公告)日：2021-04-13
申请号：US16400161
申请日：2019-05-01
申请人： CANON MEDICAL SYSTEMS CORPORATION
发明人： Takeshi Obara , Hidetaka Konta , Shinya Ozawa , Yoshimori Kassai
IPC分类号： G01R33/565 , G01R33/34 , G01R33/56 , G01R33/48
摘要： In one embodiment, an MRI apparatus includes a memory storing a predetermined program and processing circuitry. The processing circuitry configured, by executing the predetermined program, to generate a first image based on first data acquired from an object with Ultrashort TE (UTE), generate a second image based on second data acquired from the object with non-UTE, generate a mask image from the second image, and perform mask processing, by using the mask image, to remove or reduce an undesired signal around the object depicted in the first image.

10. 发明授权

US11579227B2 Magnetic resonance imaging apparatus and magnetic resonance imaging method 有权
公开(公告)号：US11579227B2
公开(公告)日：2023-02-14
申请号：US17305677
申请日：2021-07-13
申请人： CANON MEDICAL SYSTEMS CORPORATION
发明人： Mitsue Miyazaki , Yoshimori Kassai
IPC分类号： G01R33/563 , G01R33/54 , G01R33/48 , G01R33/483
摘要： 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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