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1. 发明授权

US09046590B2 Magnetic resonance imaging apparatus phase correction using one or more prescans with identical readout and slice gradients 有权
标题翻译：磁共振成像设备使用一个或多个具有相同读出和切片梯度的预扫描器进行相位校正
公开(公告)号：US09046590B2
公开(公告)日：2015-06-02
申请号：US13434935
申请日：2012-03-30
申请人： Masaaki Umeda
发明人： Masaaki Umeda
IPC分类号： G01R33/565 , G01R33/561
CPC分类号： G01R33/56518 , G01R33/5617 , G01R33/56554
摘要： In a magnetic resonance imaging apparatus according to one embodiment, an executing unit executes a first pre-scan and a second pre-scan, each being a pre-scan in which readout gradient magnetic fields and slice direction gradient magnetic fields are applied in an identical manner to a pulse sequence for main-scanning and in which phase encode gradient magnetic fields are applied in an identical manner to the pulse sequence for main-scanning up to just before echoes used in calculating a correction amount, and each having different predetermined imaging parameters; a calculating unit calculates, as a correction amount, an amount of phase shifting by referring to phase differences present in a plurality of echo signals that are collected during the first pre-scan and the second pre-scan; and a correcting unit corrects the pulse sequence for main-scanning based on the correction amount calculated by the calculating unit.
摘要翻译：在根据一个实施例的磁共振成像装置中，执行单元执行第一预扫描和第二预扫描，每个是预扫描，其中读出梯度磁场和切片方向梯度磁场以相同的方式到用于主扫描的脉冲序列，并且其中以与用于主扫描的脉冲序列相同的方式施加相位编码梯度磁场，直到用于计算校正量的回波之前，并且每个具有不同的预定成像参数 ; 计算单元通过参考在第一预扫描和第二预扫描期间收集的多个回波信号中存在的相位差来计算相移量作为校正量，作为校正量; 并且校正单元基于由计算单元计算的校正量校正用于主扫描的脉冲序列。

2. 发明授权

US08890530B2 Magnetic resonance imaging method, magnetic resonance imaging apparatus, and control device of magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像方法，磁共振成像装置以及磁共振成像装置的控制装置
公开(公告)号：US08890530B2
公开(公告)日：2014-11-18
申请号：US13187824
申请日：2011-07-21
申请人： Masaaki Umeda , Mitsukazu Kamata
发明人： Masaaki Umeda , Mitsukazu Kamata
IPC分类号： G01V3/00 , G01R33/565 , G01R33/483 , G01R33/561
CPC分类号： G01R33/56518 , G01R33/4836 , G01R33/5617
摘要： According to one embodiment, an MRI apparatus includes a signal acquisition unit, an image generating unit, a position acquiring unit, and a correction unit. The signal acquisition unit acquires a magnetic resonance signal produced from an object by applying a gradient magnetic field and an RF pulse in an imaging space where the object is placed. The image generating unit reconstructs image data on the object based on the magnetic resonance signal. The position acquiring unit acquires an imaging region as positional information in the imaging space. The correction unit brings a distribution of the gradient magnetic field close to a target distribution by transforming a waveform of the gradient magnetic field based on the positional information and a time constant of an eddy-current magnetic field to cancel the eddy-current magnetic field.
摘要翻译：根据一个实施例，MRI装置包括信号获取单元，图像生成单元，位置获取单元和校正单元。信号获取单元通过在放置物体的成像空间中施加梯度磁场和RF脉冲来获取从物体产生的磁共振信号。图像生成单元基于磁共振信号重构物体上的图像数据。位置获取单元获取成像区域作为成像空间中的位置信息。校正单元通过基于位置信息和涡流磁场的时间常数变换梯度磁场的波形来使梯度磁场接近目标分布的分布，以抵消涡流磁场。

3. 发明授权

US08643364B2 Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：US08643364B2
公开(公告)日：2014-02-04
申请号：US12953931
申请日：2010-11-24
申请人： Masaaki Umeda , Takahiro Ishihara
发明人： Masaaki Umeda , Takahiro Ishihara
IPC分类号： G01V3/00 , G01R33/48
CPC分类号： G01R33/3628 , G01R33/246 , G01R33/3678 , G01R33/5612 , G01R33/5659
摘要： A magnetic resonance imaging apparatus according to an embodiment includes an imaging unit configured to carry out magnetic resonance imaging of a patient using a transmitting QD coil which allows at least one of phase and amplitude of a radio-frequency transmit pulse on at least one input channel of the transmitting QD coil to be adjusted independently of each other, and an adjustment unit configured to adjust at least one of the phase and the amplitude of the radio-frequency transmit pulse according to imaging conditions.
摘要翻译：根据实施例的磁共振成像装置包括：成像单元，被配置为使用发射QD线圈执行患者的磁共振成像，所述发射QD线圈允许至少一个输入通道上的射频发射脉冲的相位和幅度中的至少一个的发射QD线圈彼此独立地调节;以及调整单元，被配置为根据成像条件来调整射频发射脉冲的相位和幅度中的至少一个。

4. 发明授权

US08552727B2 Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：US08552727B2
公开(公告)日：2013-10-08
申请号：US13097493
申请日：2011-04-29
申请人： Masaaki Umeda
发明人： Masaaki Umeda
IPC分类号： G01V3/00
CPC分类号： G01R33/5617 , G01R33/4822 , G01R33/565
摘要： According to a magnetic resonance imaging apparatus according to an embodiment, a Radio Frequency (RF) pulse applying unit applies to a subject a flip pulse for exciting spin of nuclei inside a subject body, and a flop pulse for refocusing the phase of the spin. A gradient magnetic-field applying unit applies a spoiler gradient magnetic field onto the subject after the flop pulse is applied, and applies a rewind gradient magnetic field before applying the flop pulse. A control unit executes a pulse sequence of controlling the gradient magnetic-field applying unit so as to keep each of the strengths of the spoiler gradient magnetic field and the rewind gradient magnetic field at respective predetermined values or higher with respect to each of a plurality of slice encodings.
摘要翻译：根据实施例的磁共振成像装置，射频（RF）脉冲施加单元向被摄体施加用于激发对象体内的核的自旋的翻转脉冲，以及用于重新聚焦旋转相位的触发脉冲。梯度磁场施加单元在施加了触发脉冲之后对被检体施加扰流板梯度磁场，并且在施加翻转脉冲之前施加倒带梯度磁场。控制单元执行控制梯度磁场施加单元的脉冲序列，以使扰流器的每个强度梯度磁场和倒退梯度磁场相对于多个切片编码。

5. 发明申请

US20120249143A1 MAGNETIC RESONANCE IMAGING APPARATUS 有权
标题翻译：磁共振成像装置
公开(公告)号：US20120249143A1
公开(公告)日：2012-10-04
申请号：US13434935
申请日：2012-03-30
申请人： Masaaki UMEDA
发明人： Masaaki UMEDA
IPC分类号： G01R33/48
CPC分类号： G01R33/56518 , G01R33/5617 , G01R33/56554
摘要： In a magnetic resonance imaging apparatus according to one embodiment, an executing unit executes a first pre-scan and a second pre-scan, each being a pre-scan in which readout gradient magnetic fields and slice direction gradient magnetic fields are applied in an identical manner to a pulse sequence for main-scanning and in which phase encode gradient magnetic fields are applied in an identical manner to the pulse sequence for main-scanning up to just before echoes used in calculating a correction amount, and each having different predetermined imaging parameters; a calculating unit calculates, as a correction amount, an amount of phase shifting by referring to phase differences present in a plurality of echo signals that are collected during the first pre-scan and the second pre-scan; and a correcting unit corrects the pulse sequence for main-scanning based on the correction amount calculated by the calculating unit.
摘要翻译：在根据一个实施例的磁共振成像装置中，执行单元执行第一预扫描和第二预扫描，每个是预扫描，其中读出梯度磁场和切片方向梯度磁场以相同的方式到用于主扫描的脉冲序列，并且其中以与用于主扫描的脉冲序列相同的方式施加相位编码梯度磁场，直到用于计算校正量的回波之前，并且每个具有不同的预定成像参数 ; 计算单元通过参考在第一预扫描和第二预扫描期间收集的多个回波信号中存在的相位差来计算相移量作为校正量，作为校正量; 并且校正单元基于由计算单元计算的校正量校正用于主扫描的脉冲序列。

6. 发明申请

US20120019251A1 MAGNETIC RESONANCE IMAGING METHOD, MAGNETIC RESONANCE IMAGING APPARATUS, AND CONTROL DEVICE OF MAGNETIC RESONANCE IMAGING APPARATUS 有权
标题翻译：磁共振成像方法，磁共振成像装置和磁共振成像装置的控制装置
公开(公告)号：US20120019251A1
公开(公告)日：2012-01-26
申请号：US13187824
申请日：2011-07-21
申请人： Masaaki Umeda , Mitsukazu Kamata
发明人： Masaaki Umeda , Mitsukazu Kamata
IPC分类号： G01R33/44
CPC分类号： G01R33/56518 , G01R33/4836 , G01R33/5617
摘要： According to one embodiment, an MRI apparatus includes a signal acquisition unit, an image generating unit, a position acquiring unit, and a correction unit. The signal acquisition unit acquires a magnetic resonance signal produced from an object by applying a gradient magnetic field and an RF pulse in an imaging space where the object is placed. The image generating unit reconstructs image data on the object based on the magnetic resonance signal. The position acquiring unit acquires an imaging region as positional information in the imaging space. The correction unit brings a distribution of the gradient magnetic field close to a target distribution by transforming a waveform of the gradient magnetic field based on “the positional information and a time constant of an eddy-current magnetic field” to cancel the eddy-current magnetic field.
摘要翻译：根据一个实施例，MRI装置包括信号获取单元，图像生成单元，位置获取单元和校正单元。信号获取单元通过在放置物体的成像空间中施加梯度磁场和RF脉冲来获取从物体产生的磁共振信号。图像生成单元基于磁共振信号重构物体上的图像数据。位置获取单元获取成像区域作为成像空间中的位置信息。校正单元通过基于“涡流磁场的位置信息和时间常数”变换梯度磁场的波形来使梯度磁场接近目标分布的分布，以抵消涡流磁领域。

7. 发明申请

US20110267055A1 MAGNETIC RESONANCE IMAGING APPARATUS 有权
标题翻译：磁共振成像装置
公开(公告)号：US20110267055A1
公开(公告)日：2011-11-03
申请号：US13097493
申请日：2011-04-29
申请人： Masaaki UMEDA
发明人： Masaaki UMEDA
IPC分类号： G01R33/44
CPC分类号： G01R33/5617 , G01R33/4822 , G01R33/565
摘要： According to a magnetic resonance imaging apparatus according to an embodiment, a Radio Frequency (RF) pulse applying unit applies to a subject a flip pulse for exciting spin of nuclei inside a subject body, and a flop pulse for refocusing the phase of the spin. A gradient magnetic-field applying unit applies a spoiler gradient magnetic field onto the subject after the flop pulse is applied, and applies a rewind gradient magnetic field before applying the flop pulse. A control unit executes a pulse sequence of controlling the gradient magnetic-field applying unit so as to keep each of the strengths of the spoiler gradient magnetic field and the rewind gradient magnetic field at respective predetermined values or higher with respect to each of a plurality of slice encodings.
摘要翻译：根据实施例的磁共振成像装置，射频（RF）脉冲施加单元向被摄体施加用于激发对象体内的核的自旋的翻转脉冲，以及用于重新聚焦旋转相位的触发脉冲。梯度磁场施加单元在施加了触发脉冲之后对被检体施加扰流板梯度磁场，并且在施加翻转脉冲之前施加倒带梯度磁场。控制单元执行控制梯度磁场施加单元的脉冲序列，以使扰流器的每个强度梯度磁场和倒退梯度磁场相对于多个切片编码。

8. 发明申请

US20080061780A1 Magnetic resonance imaging apparatus and magnetic resonance imaging method 有权
标题翻译：磁共振成像装置及磁共振成像方法
公开(公告)号：US20080061780A1
公开(公告)日：2008-03-13
申请号：US11898110
申请日：2007-09-10
申请人： Shinya Yamada , Hitoshi Kanazawa , Tokunori Kimura , Masaaki Umeda
发明人： Shinya Yamada , Hitoshi Kanazawa , Tokunori Kimura , Masaaki Umeda
IPC分类号： A61B5/055 , G01N24/08
CPC分类号： G01R33/56308 , A61B5/0263 , A61B5/7285 , G01R33/5602 , G01R33/5614 , G01R33/5615 , G01R33/5616 , G01R33/5617 , G01R33/56316 , G01R33/56333 , G01R33/56509 , G01R33/5673 , G01R33/5676
摘要： A magnetic resonance imaging apparatus includes an imaging unit which applies a labeling pulse to invert a spin included in a labeling region within part of a imaging region and then collects a echo signal from a time point when an inversion time has passed from the application of the labeling pulse, and a control unit, the control unit controlling the imaging unit so that the echo signal in the imaging region is collected a plurality of times with variations in the inversion time, the control unit also controlling the imaging unit so that a time ranging from a reference time point within a biological signal obtained from a subject to the application of the labeling pulse is a time determined in accordance with the inversion time.
摘要翻译：磁共振成像装置包括成像单元，该成像单元施加标记脉冲以反转在成像区域的一部分内的标记区域中包含的自旋，然后从反转时间过去的时间点收集回波信号，标记脉冲和控制单元，所述控制单元控制所述成像单元，使得所述成像区域中的回波信号在所述反转时间的变化中被多次收集，所述控制单元还控制所述成像单元，使得所述时间范围从从受试者获得的生物信号中的参考时间点到施加标记脉冲是根据反转时间确定的时间。

9. 发明申请

US20080036458A1 Magnetic resonance diagnosing apparatus and its operating method 有权
标题翻译：磁共振诊断仪及其操作方法
公开(公告)号：US20080036458A1
公开(公告)日：2008-02-14
申请号：US11889115
申请日：2007-08-09
申请人： Isao Tatebayashi , Kiyomi Ooshima , Masaaki Umeda
发明人： Isao Tatebayashi , Kiyomi Ooshima , Masaaki Umeda
IPC分类号： G01R33/483 , G01R33/465
CPC分类号： G01R33/485 , G01R33/483 , G01R33/4835
摘要： A magnetic resonance diagnosing apparatus includes a generating unit which generates a plurality of slice images of a object for an imaging region, a determining unit which determines a plurality of slice regions for spectroscopy within the imaging region, and a measurement unit which measures a magnetic resonance spectrum of the object for each of voxels set on the plurality of determined slice regions.
摘要翻译：磁共振诊断装置包括：生成单元，其生成用于成像区域的对象的多个切片图像;确定单元，其确定成像区域内的多个用于光谱的切片区域;以及测量单元，其测量磁共振设置在多个确定的切片区域上的每个体素的对象的光谱。

10. 发明授权

US09041394B2 Magnetic resonance imaging apparatus executing phase-corrected imaging pulse sequence based on data obtained from multiple pulse sub-sequences executed without readout direction gradients but instead using phase or slice encoding direction gradients during readout 有权
标题翻译：磁共振成像设备基于从没有读出方向梯度而执行的多个脉冲子序列获得的数据执行相位校正的成像脉冲序列，而是在读出期间使用相位或切片编码方向梯度
公开(公告)号：US09041394B2
公开(公告)日：2015-05-26
申请号：US13149080
申请日：2011-05-31
申请人： Masaaki Umeda
发明人： Masaaki Umeda
IPC分类号： G01R33/565 , G01R33/561
CPC分类号： G01R33/5617 , G01R33/56554
摘要： A magnetic resonance imaging apparatus according to an embodiment includes an executing unit, a calculating unit, and a correcting unit. The executing unit executes a first pre-scan in which a readout gradient magnetic field and a phase encoding gradient magnetic field are not applied and sampling gradient magnetic fields is applied in a phase encoding direction and a second pre-scan in which the readout gradient magnetic field is not applied, the sampling gradient magnetic field is applied at the same echo signal as that in the first pre-scan, and a representative phase encoding gradient magnetic field in a main scan. The calculating unit calculates the amount of correction from phase differences between the echo signals collected by the first pre-scan and between the echo signals collected by the second pre-scan. The correcting unit corrects the pulse sequence for the main scan on the basis of the calculated amount of correction.
摘要翻译：根据实施例的磁共振成像装置包括执行单元，计算单元和校正单元。执行单元执行其中不施加读出梯度磁场和相位编码梯度磁场的第一预扫描，并且在相位编码方向和第二预扫描中施加采样梯度磁场，其中读出梯度磁采样梯度磁场以与第一预扫描相同的回波信号施加，主扫描中代表相位编码梯度磁场。计算单元从由第一预扫描收集的回波信号与由第二预扫描收集的回波信号之间的相位差计算校正量。校正单元根据计算出的校正量校正主扫描的脉冲序列。

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