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1. 发明申请

US20140361771A1 MAGNETIC RESONANCE IMAGING APPARATUS AND RECONSTRUCTED IMAGE ACQUISITION METHOD 有权
标题翻译：磁共振成像装置和重构图像采集方法
公开(公告)号：US20140361771A1
公开(公告)日：2014-12-11
申请号：US14113259
申请日：2012-05-09
申请人： Yasuhiro Kamada , Masahiro Takizawa
发明人： Yasuhiro Kamada , Masahiro Takizawa
IPC分类号： G01R33/56 , G01R33/381 , G01R33/48 , G01R33/385
CPC分类号： G01R33/56 , A61B5/055 , G01R33/381 , G01R33/385 , G01R33/4818 , G01R33/4824 , G01R33/5617
摘要： In order to improve contrast and image quality in non-orthogonal measurement without sacrificing speed, in imaging which combines a fast imaging sequence for acquiring a plurality of echo signals in one shot with non-orthogonal system measurement, the shape of a blade in which an echo train of each shot is arranged includes a fan-shaped region having the radius and the arc of a circle centered on the origin of the k space, and a region overlapping an adjacent blade. During measurement, control is performed such that an echo signal for desired TE of each blade is arranged in a low spatial frequency region of a k space, and during image reconstruction, body motion between the blades is corrected using data of the overlapping regions.
摘要翻译：为了在不牺牲速度的情况下提高非正交测量中的对比度和图像质量，在成像中组合用于以非正交系统测量的一次拍摄中获取多个回波信号的快速成像序列，其中，每个镜头的回波序列被布置成包括具有以k空间的原点为中心的圆的半径和圆弧的扇形区域和与相邻叶片重叠的区域。在测量期间，执行控制，使得每个叶片的期望TE的回波信号被布置在k空间的低空间频率区域中，并且在图像重建期间，使用重叠区域的数据来校正叶片之间的体动。

2. 发明申请

US20140197835A1 MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD 有权
标题翻译：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。

3. 发明授权

US09535146B2 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：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。

4. 发明授权

US09513356B2 Magnetic resonance imaging apparatus and reconstructed image acquisition method 有权
标题翻译：磁共振成像装置和重建图像采集方法
公开(公告)号：US09513356B2
公开(公告)日：2016-12-06
申请号：US14113259
申请日：2012-05-09
申请人： Yasuhiro Kamada , Masahiro Takizawa
发明人： Yasuhiro Kamada , Masahiro Takizawa
IPC分类号： G01V3/00 , G01R33/56 , A61B5/055 , G01R33/48 , G01R33/381 , G01R33/385 , G01R33/561
CPC分类号： G01R33/56 , A61B5/055 , G01R33/381 , G01R33/385 , G01R33/4818 , G01R33/4824 , G01R33/5617
摘要： In order to improve contrast and image quality in non-orthogonal measurement without sacrificing speed, in imaging which combines a fast imaging sequence for acquiring a plurality of echo signals in one shot with non-orthogonal system measurement, the shape of a blade in which an echo train of each shot is arranged includes a fan-shaped region having the radius and the arc of a circle centered on the origin of the k space, and a region overlapping an adjacent blade. During measurement, control is performed such that an echo signal for desired TE of each blade is arranged in a low spatial frequency region of a k space, and during image reconstruction, body motion between the blades is corrected using data of the overlapping regions.
摘要翻译：为了在不牺牲速度的情况下提高非正交测量中的对比度和图像质量，在成像中组合用于以非正交系统测量的一次拍摄中获取多个回波信号的快速成像序列，其中，每个镜头的回波序列被布置成包括具有以k空间的原点为中心的圆的半径和圆弧的扇形区域和与相邻叶片重叠的区域。在测量期间，执行控制，使得每个叶片的期望TE的回波信号被布置在k空间的低空间频率区域中，并且在图像重建期间，使用重叠区域的数据来校正叶片之间的体动。

5. 发明申请

US20120112745A1 MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD 审中-公开
标题翻译：磁共振成像装置和磁共振成像方法
公开(公告)号：US20120112745A1
公开(公告)日：2012-05-10
申请号：US13384255
申请日：2010-07-05
申请人： Masahiro Takizawa , Yoshimasa Matsuda , Yasuhiro Kamada
发明人： Masahiro Takizawa , Yoshimasa Matsuda , Yasuhiro Kamada
IPC分类号： G01R33/32
CPC分类号： G01R33/4818 , G01R33/4824
摘要： In a non-Cartesian sampling method, a trajectory along which a measurement space is sampled is optimized. That is, data placed on one spiral trajectory heading outward from the center of the measurement space is sampled from a plurality of echo signals. The sampling is performed such that the data is placed continuously, without overlapping, in order from the center to the outside. Alternatively, the data may be overlapped and a mismatch between echo signals may be corrected using the data of the overlapped portion.
摘要翻译：以非笛卡尔采样方法，对采样测量空间的轨迹进行优化。也就是说，从多个回波信号中采样放置在从测量空间的中心向外的一个螺旋轨迹上的数据。执行采样使得数据按照从中心到外部的顺序连续放置，而不重叠。或者，数据可能重叠，并且可以使用重叠部分的数据来校正回波信号之间的失配。

6. 发明申请

US20140055137A1 MAGNETIC RESONANCE IMAGING APPARATUS AND ECHO SIGNAL MEASUREMENT METHOD 有权
标题翻译：磁共振成像装置和ECHO信号测量方法
公开(公告)号：US20140055137A1
公开(公告)日：2014-02-27
申请号：US14113486
申请日：2012-05-09
申请人： Yasuhiro Kamada , Masahiro Takizawa
发明人： Yasuhiro Kamada , Masahiro Takizawa
IPC分类号： G01R33/561 , G06T11/00
CPC分类号： G01R33/5615 , A61B5/055 , G01R33/4824 , G01R33/4826 , G01R33/5617 , G06T11/006
摘要： In order to improve contrast in non-orthogonal measurement without sacrificing speed, in imaging which combines a fast imaging sequence for acquiring a plurality of echo signals in one shot with non-orthogonal system measurement, the shape of a blade in which an echo train of each shot is arranged is a fan shape having the radius and the arc of a circle centered on the origin of a k space. At this time, echo signal arrangement is controlled such that an echo signal for desired TE of each fan-shaped blade is arranged in a low spatial frequency region of the k space.
摘要翻译：为了在不牺牲速度的情况下改善非正交测量中的对比度，在成像中组合用于以非正交系统测量在一次拍摄中获取多个回波信号的快速成像序列，其中叶片的形状为每个镜头被布置为具有以ak空间的原点为中心的圆的半径和圆弧的扇形。此时，控制回波信号布置，使得每个扇形叶片的期望TE的回波信号被布置在k空间的低空间频率区域中。

7. 发明授权

US09594142B2 Magnetic resonance imaging apparatus and echo signal measurement method 有权
标题翻译：磁共振成像装置和回波信号测量方法
公开(公告)号：US09594142B2
公开(公告)日：2017-03-14
申请号：US14113486
申请日：2012-05-09
申请人： Yasuhiro Kamada , Masahiro Takizawa
发明人： Yasuhiro Kamada , Masahiro Takizawa
IPC分类号： G01R33/561 , A61B5/055 , G01R33/48 , G06T11/00
CPC分类号： G01R33/5615 , A61B5/055 , G01R33/4824 , G01R33/4826 , G01R33/5617 , G06T11/006
摘要： In order to improve contrast in non-orthogonal measurement without sacrificing speed, in imaging which combines a fast imaging sequence for acquiring a plurality of echo signals in one shot with non-orthogonal system measurement, the shape of a blade in which an echo train of each shot is arranged is a fan shape having the radius and the arc of a circle centered on the origin of a k space. At this time, echo signal arrangement is controlled such that an echo signal for desired TE of each fan-shaped blade is arranged in a low spatial frequency region of the k space.
摘要翻译：为了在不牺牲速度的情况下改善非正交测量中的对比度，在成像中组合用于以非正交系统测量在一次拍摄中获取多个回波信号的快速成像序列，其中叶片的形状为每个镜头被布置为具有以ak空间的原点为中心的圆的半径和圆弧的扇形。此时，控制回波信号布置，使得每个扇形叶片的期望TE的回波信号被布置在k空间的低空间频率区域中。

8. 发明授权

US08207734B2 Parallel imaging in non-cartesian magnetic resonance imaging (MRI) and MRI apparatus realizing the same 有权
标题翻译：并行成像在非笛卡尔磁共振成像（MRI）和MRI设备中实现相同
公开(公告)号：US08207734B2
公开(公告)日：2012-06-26
申请号：US12529396
申请日：2008-03-03
申请人： Tetsuhiko Takahashi , Masahiro Takizawa , Yasuhiro Kamada
发明人： Tetsuhiko Takahashi , Masahiro Takizawa , Yasuhiro Kamada
IPC分类号： G01V3/00
CPC分类号： G01R33/5611 , G01R33/4824 , G01R33/5615
摘要： An MRI apparatus capable of performing a high-speed operation for removing aliasing from the data measured by non-Cartesian imaging in a real space with a small amount of operation is provided. Non-Cartesian data sampling is performed by thinning the number of data by using multiple receiver coils having different sensitivity distribution from each other. Image reconstruction means creates orthogonal data by gridding non-orthogonal data obtained by each receiver coil on a grid having an equal spatial resolution to and a narrower field of view than a target image, subjects it to Fourier transform and creates the first image data containing aliasing components. The second image data is created by using the first image data created for each receiver coil and a sensitivity distribution of each receiver coil.
摘要翻译：提供了一种MRI装置，其能够执行用于以少量操作在实际空间中通过非笛卡尔成像测量的数据去除混叠的高速操作。通过使用具有彼此不同的灵敏度分布的多个接收器线圈来稀疏数据来执行非笛卡尔数据采样。图像重建装置通过网格化由每个接收器线圈获得的非正交数据在具有与目标图像相等的空间分辨率和较窄视场的网格上产生正交数据，使其进行傅里叶变换，并创建包含混叠的第一图像数据组件。通过使用为每个接收器线圈创建的第一图像数据和每个接收器线圈的灵敏度分布来创建第二图像数据。

9. 发明申请

US20100039110A1 MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD 有权
标题翻译：磁共振成像装置和磁共振成像方法
公开(公告)号：US20100039110A1
公开(公告)日：2010-02-18
申请号：US12529396
申请日：2008-03-03
申请人： Tetsuhiko Takahashi , Masahiro Takizawa , Yasuhiro Kamada
发明人： Tetsuhiko Takahashi , Masahiro Takizawa , Yasuhiro Kamada
IPC分类号： G01R33/48 , G06K9/00
CPC分类号： G01R33/5611 , G01R33/4824 , G01R33/5615
摘要： An MRI apparatus capable of performing a high-speed operation for removing aliasing from the data measured by non-Cartesian imaging in a real space with a small amount of operation is provided. Non-Cartesian data sampling is performed by thinning the number of data by using multiple receiver coils having different sensitivity distribution from each other. Image reconstruction means creates orthogonal data by gridding non-orthogonal data obtained by each receiver coil on a grid having an equal spatial resolution to and a narrower field of view than a target image, subjects it to Fourier transform and creates the first image data containing aliasing components. The second image data is created by using the first image data created for each receiver coil and a sensitivity distribution of each receiver coil.
摘要翻译：提供了一种MRI装置，其能够执行用于以少量操作在实际空间中通过非笛卡尔成像测量的数据去除混叠的高速操作。通过使用具有彼此不同的灵敏度分布的多个接收器线圈来稀疏数据来执行非笛卡尔数据采样。图像重建装置通过网格化由每个接收器线圈获得的非正交数据在具有与目标图像相等的空间分辨率和较窄视场的网格上产生正交数据，使其进行傅里叶变换，并创建包含混叠的第一图像数据组件。通过使用为每个接收器线圈创建的第一图像数据和每个接收器线圈的灵敏度分布来创建第二图像数据。

10. 发明申请

US20130207653A1 MAGNETIC RESONANACE IMAGING APPARATUS AND METHOD FOR MEASURING IRRADIATION MAGNETIC FIELD 有权
标题翻译：磁共振成像装置和测量辐射磁场的方法
公开(公告)号：US20130207653A1
公开(公告)日：2013-08-15
申请号：US13880634
申请日：2011-10-13
申请人： Kosuke Ito , Masahiro Takizawa
发明人： Kosuke Ito , Masahiro Takizawa
IPC分类号： G01R33/56
CPC分类号： G01R33/56 , A61B5/055 , G01R33/246 , G01R33/443 , G01R33/5659
摘要： There is provided an MRI apparatus capable of measuring the B1 distribution of an RF transmission coil in a short time with high accuracy. In order to realize this, imaging means of the MRI apparatus includes a B1 distribution measurement sequence that includes an application of a pre-pulse by RF radiation means and a plurality of signal acquisition sequences with different elapsed time (TI) from the pre-pulse. The signal acquisition sequence uses a pulse having a small flip angle as an RF pulse and is executed before the longitudinal relaxation after the pre-pulse ends. Calculation means calculates the B1 distribution of the RF radiation means using image data with different TI acquired in the respective signal acquisition sequences.
摘要翻译：提供了能够以高精度在短时间内测量RF传输线圈的B1分布的MRI装置。为了实现这一点，MRI装置的成像装置包括B1分布测量序列，其包括通过RF辐射装置应用预脉冲和来自预脉冲的具有不同经过时间（TI）的多个信号采集序列。信号采集序列使用具有小翻转角的脉冲作为RF脉冲，并且在预脉冲结束之后在纵向弛豫之前执行。计算装置使用在各个信号采集序列中获取的具有不同TI的图像数据来计算RF辐射装置的B1分布。

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