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1. 发明专利

JP5591500B2 Magnetic resonance imaging apparatus, and image reconstruction program 有权
公开(公告)号：JP5591500B2
公开(公告)日：2014-09-17
申请号：JP2009178329
申请日：2009-07-30
申请人：株式会社日立メディコ
发明人：光花田 , 将宏瀧澤
IPC分类号： A61B5/055 , G01R33/48 , G01R33/54
摘要： PROBLEM TO BE SOLVED: To provide a magnetic resonance imaging apparatus performing a highly precise estimation process suited to a radial sampling method. SOLUTION: This magnetic resonance imaging apparatus acquires, in a measurement space, a plurality of nuclear magnetic resonance signal data which are radially disposed around an origin. In the measurement space, a filter is set for selecting data in a first region within a prescribed range from the origin and in a second region including a range separated from the origin with respect to the first region. The selected data are inverse Fourier transformed to acquire first-region inverse-Fourier-transformed data and second-region inverse-Fourier-transformed data. A phase value of the first-region inverse-Fourier-transformed data is subtracted from that of the second-region inverse-Fourier-transformed data to acquire complex conjugate data and acquire estimation data. A reconstruction image is acquired by adding the first and second inverse-Fourier-transformed data and the complex conjugate data. The first and second regions are set not to be overlapped with the estimation data, when the estimation data are Fourier transformed and virtually disposed in the k-space. COPYRIGHT: (C)2011,JPO&INPIT

2. 发明专利

JP4993960B2 Nuclear magnetic resonance imaging apparatus 有权
公开(公告)号：JP4993960B2
公开(公告)日：2012-08-08
申请号：JP2006190500
申请日：2006-07-11
申请人：株式会社日立メディコ
发明人：将宏瀧澤 , 哲彦高橋
IPC分类号： A61B5/055
摘要： PROBLEM TO BE SOLVED: To provide an MRI apparatus capable of suppressing a degradation in image quality due to table movement, in an imaging pulse sequence. SOLUTION: A nuclear magnetic resonance imaging apparatus is further provided with a B0 coil for applying magnetic field pulses (B0 pulses) of uniform space distribution to an imaging space. In the pulse sequence of continuously moving a table, the BO pulses are applied to the imaging space in synchronism with the applying of gradient magnetic field pulses to the imaging space for the moving direction of the table. Thus, A change in an amount of a gradient magnetic field applied to an excitation area attending the table movement is corrected by the BO pulses. Thus, acquired nuclear magnetic resonance (NMR) signals are not affected by the change in the amount of the gradient magnetic field due to the table movement and the degradation in the image quality is suppressed. COPYRIGHT: (C)2008,JPO&INPIT

3. 发明专利

JP4975716B2 Magnetic resonance imaging apparatus 有权
公开(公告)号：JP4975716B2
公开(公告)日：2012-07-11
申请号：JP2008297425
申请日：2008-11-21
申请人：株式会社日立メディコ
发明人：尚子永尾 , 将宏瀧澤 , 貴之阿部 , 哲彦高橋
IPC分类号： A61B5/055
CPC分类号： A61B5/055 , G01R33/56375
摘要： A magnetic resonance imaging apparatus comprises static magnetic field generating means for generating a static magnetic field in an imaging space, a gradient magnetic field generating means for generating a gradient magnetic field in the imaging space, high-frequency magnetic field generating means for generating a high-frequency magnetic field so as to induce nuclear magnetic resonance in a subject placed in the imaging space, signal receiving means for detecting a nuclear magnetic resonance signal from the subject, signal processing means for reconstructing an image by using the detected nuclear magnetic resonance signal, display means for displaying the image, a table for placing the subject thereon to dispose the subject in the imaging means, and table moving means for moving the table on which the subject is placed. While moving the portions to be imaged of the subject continuously or stepwise in the imaging space and disposing the subject, a whole-body image of a large region of the subject is created. The magnetic resonance imaging apparatus further comprises means for detecting information on the displacement of the subject from a desired position and setting means for setting movement information on the table according to the displacement information. The table moving means moves the table according to the movement information set by the setting means to capture the whole-body image.

4. 发明专利

JP4912156B2 Magnetic resonance imaging method and apparatus 有权
公开(公告)号：JP4912156B2
公开(公告)日：2012-04-11
申请号：JP2006553953
申请日：2006-01-19
申请人：株式会社日立メディコ
发明人：将宏瀧澤 , 哲彦高橋
IPC分类号： A61B5/055
CPC分类号： G01R33/56375 , G01R33/5611 , G01R33/56383
摘要： There is provided an MRI device capable of obtaining an image having areas from which return artifact has been removed in the multi-station imaging method and the moving bed imaging method. When imaging an examinee (101) placed in an magnetostatic field space while moving the examinee (101) with respect tot he magnetostatic field space, imaging is performed assuming that the phase encode direction is the moving direction of the examinee (101). Calculation is performed by using a set of a plurality of nuclear magnetic resonance signals acquired when the examinee (101) was located at a plurality of different positions and sensitivity distribution of a reception coil (105) so as to obtain an image of a plurality of areas from which an image return in the moving direction is removed.

5. 发明专利

JPWO2010047245A1 磁気共鳴イメージング装置及び方法有权
公开(公告)号：JPWO2010047245A1
公开(公告)日：2012-03-22
申请号：JP2010534773
申请日：2009-10-13
申请人：株式会社日立メディコ
发明人：瀧澤　将宏 , 将宏瀧澤 , 高橋　哲彦 , 哲彦高橋 , 正幸磯部 , 正幸磯部 , チャンビョムアン , チャンビョムアン , ジョンイルパク , ジョンイルパク
IPC分类号： A61B5/055 , G01R33/387
CPC分类号： G01R33/4824 , G01R33/56518 , G01R33/56572
摘要：静磁場発生手段と、傾斜磁場発生手段と、高周波磁場発生手段と、受信手段と、信号処理手段と、前記傾斜磁場発生手段、前記高周波磁場発生手段、前記受信手段及び前記信号処理手段を制御する制御手段を備えた磁気共鳴イメージング装置において、前記傾斜磁場の出力誤差を、前記傾斜磁場それぞれの方向について、複数個のパラメータ値の組み合わせを用いて近似する近似手段と、前記複数個のパラメータ値の組み合わせを前記近似手段により近似された前記傾斜磁場の出力誤差を考慮に入れて再構成された磁気共鳴画像の画質を基に評価する評価手段と、前記評価手段による評価結果に基づいて前記複数個のパラメータ値の組み合わせの内所望なものを決定する決定手段を備える。

6. 发明专利

JP4675936B2 Nuclear magnetic resonance imaging apparatus 有权
公开(公告)号：JP4675936B2
公开(公告)日：2011-04-27
申请号：JP2007151364
申请日：2007-06-07
申请人：株式会社日立メディコ
发明人：将宏瀧澤 , 哲彦高橋
IPC分类号： A61B5/055
摘要： PROBLEM TO BE SOLVED: To apply a parallel nuclear magnetic resonance photographing method to a moving image to provide an image being effective for diagnosis without causing deterioration of quality of image at high speed. SOLUTION: In an MRI device using a plurality of receiving coils having detection sensitivity regions having a part overlapped spatially and divided from each other, echo signals are continuously measured following occurrence of transverse magnetization by high frequency pulses. Distribution of sensitivity of each receiving coil is calculated by using a part of the continuously measured echo signal to reconstitute an image by using the calculated distribution of sensitivity and the continuously measured echo signal. COPYRIGHT: (C)2008,JPO&INPIT

7. 发明专利

JPWO2008111416A1 磁気共鳴イメージング装置および磁気共鳴イメージング方法有权
公开(公告)号：JPWO2008111416A1
公开(公告)日：2010-06-24
申请号：JP2009503969
申请日：2008-03-03
申请人：株式会社日立メディコ
发明人：高橋　哲彦 , 哲彦高橋 , 瀧澤　将宏 , 将宏瀧澤 , 康弘鎌田 , 康弘鎌田
IPC分类号： A61B5/055 , G01R33/3415 , G01R33/54
CPC分类号： G01R33/5611 , G01R33/4824 , G01R33/5615
摘要：非直交撮影によって計測したデータに対し実空間での折り返し除去演算を少ない演算量で高速に行なうことが可能なMRI装置を提供する。互いに異なる感度分布を有する複数の受信コイルを用いて、データ数を間引いた非直交データサンプリングを行う。画像再構成手段は、各受信コイルについて、得られた非直交データを、目的画像と空間分解能が等しく、視野が狭いグリッドにグリッディングして直交データを作成し、これをフーリエ変換して、折り返し成分を含む第1の画像データを作成する。各受信コイルについて作成された第1の画像データ、各受信コイルの感度分布を用いて、折り返しのない第2の画像データを作成する。

8. 发明专利

JP4454268B2 Magnetic resonance imaging apparatus 有权
公开(公告)号：JP4454268B2
公开(公告)日：2010-04-21
申请号：JP2003315865
申请日：2003-09-08
申请人：株式会社日立メディコ
发明人：智宏後藤 , 博幸板垣 , 将宏瀧澤 , 哲彦高橋
IPC分类号： A61B5/055 , G01R33/28 , G01R33/48
摘要： PROBLEM TO BE SOLVED: To provide an MRI system which can acquire an electrocardiographic synchronous image with no artefact by adapting to various changes also including continuous or irregular variations in cardiac cycle. SOLUTION: A pulse sequence for measuring a plurality of echo signals 410 with different phase encode amounts within one cycle is performed by making an R-wave 404 serve as a trigger, and some of echo signals 411 of low-frequency components, which are measured within the cycle, are measured in such a manner that the signals with the same phase encode amount overlap one another. In the reconstitution of the image, a cycle interval 401 is computed for each cycle; a predetermined time phase (time 407) is determined according to the cycle interval; a signal 413 measured by the determined time phase is selected from among the signals 411 with the same phase encode amount, which are measured in an overlapping manner within one cycle; and the image is reconstituted by using the selected signal 413 and a signal 412 different in the phase encode amount from the signal 413. COPYRIGHT: (C)2005,JPO&NCIPI

9. 发明专利

JP4391214B2 Magnetic resonance imaging apparatus 有权
公开(公告)号：JP4391214B2
公开(公告)日：2009-12-24
申请号：JP2003414506
申请日：2003-12-12
申请人：株式会社日立メディコ
发明人：将宏瀧澤 , 正幸野中
IPC分类号： A61B5/055 , G01R33/54
摘要： PROBLEM TO BE SOLVED: To provide a MRI apparatus with a plurality of receiving coils, on each of which phase encoding is selectively operated and acquired signals are developed with a sensitivity distribution of the receiving coil by matrix calculation, which is a high-speed photographing method (parallel imaging method) aiming for a shorter imaging time, less calculation, and a better SN ratio. SOLUTION: Adding echo data for the sensitivity distribution or sensitivity distributions of the receiving coil between more than two adjoining slices shares them and improves the SN ratio of the sensitivity distribution. When the same slice is redundantly imaged, obtaining a sensitivity distribution by measuring echo data for the sensitivity distribution only once and sharing it on the slice to be redundantly imaged can omit a process of obtaining the same sensitivity distribution more than once. COPYRIGHT: (C)2005,JPO&NCIPI

10. 发明专利

JP4390328B2 Magnetic resonance imaging apparatus 有权
公开(公告)号：JP4390328B2
公开(公告)日：2009-12-24
申请号：JP29657299
申请日：1999-10-19
申请人：株式会社日立メディコ
发明人：将宏瀧澤 , 哲彦高橋
IPC分类号： A61B5/055 , G01R33/48
摘要： PROBLEM TO BE SOLVED: To provide stable images free of linear artifacts and image distortion through EPI imaging. SOLUTION: Phase changes between pre-measurement echo signals which are adjacent to each other in time are calculated by use of a pre-measurement echo signal which is measured, separately from a main measurement echo signal for image capturing, within each period of a readout gradient magnetic field which is reversed without application of a phase encoding inclined pulse, and a map of phase differences is originated by use of each phase change (107, 108). In this case, elimination of and averaging of the phase differences, etc., are effected to enhance the accuracy of the phase differences (109, 110). The lag of sampling times when the main measurement echo signal is obtained by use of the map of the phase differences is calculated (112). The sampling times of a main measurement sequence are adjusted so that the lags match among odd-numbered echoes and even-numbered echoes in EPI (114).

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