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    Magnetic resonance imaging apparatus and magnetic resonance imaging method
    1.
    发明授权
    Magnetic resonance imaging apparatus and magnetic resonance imaging method 有权
    磁共振成像装置及磁共振成像方法

    公开(公告)号：US09535146B2

    公开(公告)日：2017-01-03

    申请号：US14240192

    申请日：2012-09-19

    申请人： Yasuhiro Kamada ,  Hikaru Hanada ,  Masahiro Takizawa

    发明人： Yasuhiro Kamada ,  Hikaru Hanada ,  Masahiro Takizawa

    IPC分类号： G01R33/48 ,  G01R33/56 ,  G01R33/561

    CPC分类号： G01R33/482 ,  G01R33/4824 ,  G01R33/5608 ,  G01R33/5611

    摘要： In the non-Cartesian measurement, image quality is improved while the advantages of non-Cartesian measurement are maintained. To realize the aforementioned, in the non-Cartesian measurement, artifacts caused by non-uniform data density in k-space are reduced. Therefore, each unit k-space is imaged by an inverse Fourier transform, the field of view of the image is enlarged in a direction in which data density is to be increased, and the image after the enlargement of the field of view is Fourier transformed and gridded as unit k-space that has a small k-space pitch in the direction in which the field of view has been enlarged and has an increased amount of data. This processing is repeated for all blades.

    摘要翻译： 在非笛卡尔测量中，图像质量得到改善，同时保持非笛卡尔测量的优点。 为了实现上述，在非笛卡尔测量中，减少了由k空间中的不均匀数据密度引起的伪像。 因此，通过逆傅里叶变换对每个单位k空间进行成像，在增加数据密度的方向上放大图像的视场，并且将视场放大后的图像进行傅立叶变换 并且在视野扩大方向上具有小的k空间节距并且具有增加的数据量的单元k空间格网。 对所有刀片重复此处理。

    MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD
    2.
    发明申请
    MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD 有权
    磁共振成像装置和磁共振成像方法

    公开(公告)号：US20140197835A1

    公开(公告)日：2014-07-17

    申请号：US14240192

    申请日：2012-09-19

    申请人： Yasuhiro Kamada ,  Hikaru Hanada ,  Masahiro Takizawa

    发明人： Yasuhiro Kamada ,  Hikaru Hanada ,  Masahiro Takizawa

    IPC分类号： G01R33/48

    CPC分类号： G01R33/482 ,  G01R33/4824 ,  G01R33/5608 ,  G01R33/5611

    摘要： In the non-Cartesian measurement, image quality is improved while the advantages of non-Cartesian measurement are maintained. To realize the aforementioned, in the non-Cartesian measurement, artifacts caused by non-uniform data density in k-space are reduced. Therefore, each unit k-space is imaged by an inverse Fourier transform, the field of view of the image is enlarged in a direction in which data density is to be increased, and the image after the enlargement of the field of view is Fourier transformed and gridded as unit k-space that has a small k-space pitch in the direction in which the field of view has been enlarged and has an increased amount of data. This processing is repeated for all blades.

    摘要翻译： 在非笛卡尔测量中，图像质量得到改善，同时保持非笛卡尔测量的优点。 为了实现上述，在非笛卡尔测量中，减少了由k空间中的不均匀数据密度引起的伪像。 因此，通过逆傅里叶变换对每个单位k空间进行成像，在增加数据密度的方向上放大图像的视场，并且将视场放大后的图像进行傅立叶变换 并且在视野扩大方向上具有小的k空间节距并且具有增加的数据量的单元k空间格网。 对所有刀片重复此处理。

    MAGNETIC RESONANCE IMAGING APPARATUS AND CORRECTION VALUE CALCULATION METHOD
    3.
    发明申请
    MAGNETIC RESONANCE IMAGING APPARATUS AND CORRECTION VALUE CALCULATION METHOD 有权
    磁共振成像装置和校正值计算方法

    公开(公告)号：US20140167752A1

    公开(公告)日：2014-06-19

    申请号：US14232470

    申请日：2012-08-21

    申请人： Hikaru Hanada ,  Kuniharu Oka ,  Masaharu Ono ,  Masahiro Takizawa

    发明人： Hikaru Hanada ,  Kuniharu Oka ,  Masaharu Ono ,  Masahiro Takizawa

    IPC分类号： G01R33/561

    CPC分类号： G01R33/561 ,  A61B5/055 ,  G01R33/4816

    摘要： In order to obtain a high-quality image even in multi-slice imaging in a UTE sequence that uses a half RF pulse, a refocusing pulse of the slice gradient magnetic field is adjusted and applied so that the excitation profiles of positive polarity data and negative polarity data have phase distributions that are 180 [deg] inverted with respect to each other in side lobe portions. In addition, the irradiation frequency of the half RF pulse is adjusted so as to eliminate a position shift between the intensity distributions of the positive polarity data and the negative polarity data.

    摘要翻译： 为了获得即使在使用半RF脉冲的UTE序列中的多层成像中的高质量图像，调整并应用切片梯度磁场的重聚焦脉冲，使得正极性数据的激励分布和负 极性数据具有在旁瓣部分中相对于彼此180°反相的相位分布。 此外，调整半RF脉冲的照射频率，以消除正极性数据和负极性数据的强度分布之间的位置偏移。

    MAGNETIC RESONANCE IMAGING APPARATUS AND GRADIENT MAGNETIC FIELD WAVERFORM ESTIMATION METHOD
    4.
    发明申请
    MAGNETIC RESONANCE IMAGING APPARATUS AND GRADIENT MAGNETIC FIELD WAVERFORM ESTIMATION METHOD 有权
    磁共振成像装置和梯度磁场波形估计方法

    公开(公告)号：US20140125333A1

    公开(公告)日：2014-05-08

    申请号：US14128051

    申请日：2012-06-27

    申请人： Hikaru Hanada ,  Yoshitaka Sato ,  Kosuke Hirai ,  Kuniharu Oka ,  Masahiro Takizawa ,  Naoya Sakaguchi ,  Hidehisa Akimaru ,  Miyuki Kawamura

    发明人： Hikaru Hanada ,  Yoshitaka Sato ,  Kosuke Hirai ,  Kuniharu Oka ,  Masahiro Takizawa ,  Naoya Sakaguchi ,  Hidehisa Akimaru ,  Miyuki Kawamura

    IPC分类号： G01R33/565

    CPC分类号： G01R33/56518 ,  A61B5/055 ,  G01R33/56572

    摘要： In order to obtain a highly reliable image with no image distortion or no artifacts, such as ghosting, by compensating for the distortion of an output gradient magnetic field waveform caused by various factors with high accuracy, an input gradient magnetic field waveform and an output gradient magnetic field waveform corresponding to the input gradient magnetic field waveform are calculated, a response function that is a sum of response functions of a plurality of elements affecting the output gradient magnetic field waveform is calculated using the input gradient magnetic field waveform and the output gradient magnetic field waveform, an output gradient magnetic field waveform is calculated from an input gradient magnetic field waveform of a gradient magnetic field pulse set in the imaging sequence using the response function, and various kinds of correction are performed using the calculated value of the calculated output gradient magnetic field waveform.

    摘要翻译： 为了通过补偿由高精度的各种因素引起的输出梯度磁场波形的失真，获得没有图像失真或无伪影的高可靠性图像，例如重影，输入梯度磁场波形和输出梯度 计算与输入梯度磁场波形对应的磁场波形，使用输入梯度磁场波形和输出梯度磁场计算作为影响输出梯度磁场波形的多个元素的响应函数之和的响应函数 使用响应函数从成像序列中设定的梯度磁场脉冲的输入梯度磁场波形计算输出梯度磁场波形，并使用计算出的输出梯度的计算值来进行各种校正 磁场波形。