公开(公告)号：US09123121B2

公开(公告)日：2015-09-01

申请号：US13823837

申请日：2011-09-11

申请人： Takashi Nishihara ,  Hiroyuki Itagaki ,  Kosuke Hirai

发明人： Takashi Nishihara ,  Hiroyuki Itagaki ,  Kosuke Hirai

IPC分类号： G06T7/00 ,  A61B5/055 ,  A61B5/0285 ,  G01R33/48 ,  G01R33/563 ,  G01R33/483

CPC分类号： G06T7/0081 ,  A61B5/0285 ,  A61B5/055 ,  G01R33/4818 ,  G01R33/4838 ,  G01R33/563

摘要： In imaging for labeling only the fluid of a specific region, a high-quality image is acquired in a short time. In order to achieve this, the optimal number of segments N is determined from the flow velocity V and the size φ of a specific region to be labeled when performing imaging by labeling only the fluid of the specific region using a two-dimensional selective excitation pulse as a pre-pulse. In addition, the k-space ordering is determined according to the arrival timing of the fluid to the imaging region. In addition, the optimal flip angle (FA) is determined depending on the type of pre-pulse.

摘要翻译： 在用于仅标记特定区域的流体的成像中，在短时间内获取高质量图像。 为了实现这一点，根据流速V和尺寸＆phgr;确定段N的最佳数量。 通过使用二维选择性激发脉冲作为前置脉冲仅标记特定区域的流体进行成像时，要标记的特定区域。 另外，根据流体到成像区域的到达时刻来确定k空间排序。 另外，根据预脉冲的类型确定最佳翻转角（FA）。

公开(公告)号：US20130266199A1

公开(公告)日：2013-10-10

申请号：US13823837

申请日：2011-09-11

申请人： Takashi Nishihara ,  Hiroyuki Itagaki ,  Kosuke Hirai

发明人： Takashi Nishihara ,  Hiroyuki Itagaki ,  Kosuke Hirai

IPC分类号： G06T7/00

CPC分类号： G06T7/0081 ,  A61B5/0285 ,  A61B5/055 ,  G01R33/4818 ,  G01R33/4838 ,  G01R33/563

摘要： In imaging for labeling only the fluid of a specific region, a high-quality image is acquired in a short time. In order to achieve this, the optimal number of segments N is determined from the flow velocity V and the size φ of a specific region to be labeled when performing imaging by labeling only the fluid of the specific region using a two-dimensional selective excitation pulse as a pre-pulse. In addition, the k-space ordering is determined according to the arrival timing of the fluid to the imaging region. In addition, the optimal flip angle (FA) is determined depending on the type of pre-pulse.

摘要翻译： 在用于仅标记特定区域的流体的成像中，在短时间内获取高质量图像。 为了实现这一点，当通过使用二维选择性激发脉冲仅标记特定区域的流体进行成像时，从流速V和要标记的特定区域的尺寸phi确定段N的最佳数量 作为预脉冲。 另外，根据流体到成像区域的到达时刻来确定k空间排序。 另外，根据预脉冲的类型确定最佳翻转角（FA）。

公开(公告)号：US20120194190A1

公开(公告)日：2012-08-02

申请号：US13496921

申请日：2010-09-22

申请人： Tomohiro Goto ,  Takashi Nishihara ,  Hiroyuki Itagaki

发明人： Tomohiro Goto ,  Takashi Nishihara ,  Hiroyuki Itagaki

IPC分类号： G01R33/48

CPC分类号： G01R33/4836 ,  A61B5/055 ,  G01R33/4833 ,  G01R33/4838 ,  G01R33/543 ,  G01R33/546 ,  G01R33/5676

摘要： In imaging using 2-dimensional selective excitation pulses, regardless of applications thereof, a technique for obtaining a high quality image is provided.In the technique, a 2-dimensional selective excitation sequence is carried out while changing a coefficient for determining the cylinder diameter of a region excited by the 2-dimensional selective excitation sequence and a time difference for determining an offset position.The obtained excitation region and a desired region are compared with each other, and the coefficient and time difference with which the obtained excitation region and the desired region match each other are determined to be the optimum ones.The determination processing may be performed as an initial adjustment, may be performed according to need in each imaging, or may be performed on a per-application basis.

摘要翻译： 在使用二维选择性激发脉冲的成像中，无论其应用如何，都提供了获得高质量图像的技术。 在该技术中，在改变用于确定由二维选择激励序列激发的区域的圆柱体直径的系数和用于确定偏移位置的时间差的同时，执行二维选择性激励序列。 将获得的激发区域和期望区域进行比较，将获得的激发区域和期望区域相互匹配的系数和时间差确定为最佳。 可以根据每次成像中的需要执行确定处理作为初始调整，或者可以在每个应用的基础上执行。

公开(公告)号：US09615768B2

公开(公告)日：2017-04-11

申请号：US13496916

申请日：2010-09-16

申请人： Takashi Nishihara ,  Hiroyuki Itagaki ,  Tomohiro Goto

发明人： Takashi Nishihara ,  Hiroyuki Itagaki ,  Tomohiro Goto

IPC分类号： G01R33/48 ,  A61B5/055 ,  A61B5/00 ,  G01R33/44 ,  G01R33/483 ,  G01R33/24 ,  G01R33/3875

CPC分类号： A61B5/055 ,  A61B5/489 ,  G01R33/243 ,  G01R33/3875 ,  G01R33/446 ,  G01R33/4836

摘要： A high-quality image is obtained using a two-dimensional selective excitation method even if the static magnetic field is not uniform. Therefore, non-uniformity of a static magnetic field of a region to be focused in particular in a selective excitation region excited by 2DRF is measured, and a result of the measurement is reflected in an imaging sequence using the 2DRF. For example, a resonance frequency of magnetization obtained from the measurement result is set as an irradiation frequency of the 2DRF. In addition, a shim gradient magnetic field is applied so as to correct the non-uniformity of the magnetization obtained from the measurement result. These are applied only in the imaging sequence using the 2DRF, and an irradiation frequency and a shim gradient magnetic field set in a conventional method are used in other imaging sequences.

公开(公告)号：US09035652B2

公开(公告)日：2015-05-19

申请号：US13504590

申请日：2010-11-11

申请人： Takashi Nishihara ,  Hiroyuki Itagaki

发明人： Takashi Nishihara ,  Hiroyuki Itagaki

IPC分类号： G01R33/48 ,  A61B5/055 ,  A61B5/00 ,  G01R33/483

CPC分类号： G01R33/4828 ,  A61B5/055 ,  A61B5/4312 ,  A61B5/7257 ,  G01R33/4836

摘要： An MRI apparatus and a two-dimensional excitation adjustment method capable of performing appropriately two-dimensional excitation of a region, in which materials with different resonance frequencies are present, according to imaging conditions are provided. In order to do so, when performing the two-dimensional excitation of a two-dimensional excitation region of an object formed by a first material with a first resonance frequency and a second material with a second resonance frequency, an irradiation frequency of a high-frequency magnetic field for the two-dimensional excitation is set on the basis of the imaging conditions related to the two-dimensional excitation and the first and second resonance frequencies so that desired regions of the first and second materials are excited in a two-dimensional manner.

摘要翻译： 提供了能够根据成像条件对存在不同谐振频率的材料进行适当二维激励的MRI装置和二维激励调整方法。 为了这样做，当由具有第一共振频率的第一材料形成的物体的二维激发区域和具有第二共振频率的第二材料进行二维激发区域的二维激发时， 基于与二维激励和第一和第二共振频率相关的成像条件来设定用于二维激励的高频磁场，使得第一和第二材料的期望区域以二维方式被激发 。

公开(公告)号：US20130265053A1

公开(公告)日：2013-10-10

申请号：US13991190

申请日：2011-11-30

申请人： Hiroyuki Itagaki ,  Takashi Nishihara

发明人： Hiroyuki Itagaki ,  Takashi Nishihara

IPC分类号： G01R33/54

CPC分类号： G01R33/543 ,  A61B5/0263 ,  A61B5/055 ,  G01R33/4836 ,  G01R33/546 ,  G01R33/5676

摘要： Disclosed is a technique which allows easy optimization of imaging conditions in imaging using two-dimensional excitation as a pre-pulse. To this end, a parameter which specifies the excitation region of the two-dimensional excitation is shifted, a value (optimum value) when a predefined index is ideal for each application to be applied is decided in a subsequent main imaging sequence, and the optimum value is set to the value of the parameter, whereby optimization is performed. A two-dimensional excitation pre-pulse which is excited under optimum excitation conditions is used to optimize the parameter in the main imaging sequence.

摘要翻译： 公开了一种技术，其允许使用二维激励作为预脉冲的成像中的成像条件的容易优化。 为此，指定二维激励的激发区域的参数被移位，在随后的主要成像序列中确定当预定索引对于每个应用程序是理想的时候的值（最佳值），并且最优 将值设置为参数的值，从而执行优化。 在最佳激发条件下激发的二维激励预脉冲用于优化主成像序列中的参数。

公开(公告)号：US09594135B2

公开(公告)日：2017-03-14

申请号：US13496921

申请日：2010-09-22

申请人： Tomohiro Goto ,  Takashi Nishihara ,  Hiroyuki Itagaki

发明人： Tomohiro Goto ,  Takashi Nishihara ,  Hiroyuki Itagaki

IPC分类号： G01R33/48 ,  G01R33/483 ,  A61B5/055 ,  G01R33/54 ,  G01R33/567

CPC分类号： G01R33/4836 ,  A61B5/055 ,  G01R33/4833 ,  G01R33/4838 ,  G01R33/543 ,  G01R33/546 ,  G01R33/5676

摘要： In imaging using 2-dimensional selective excitation pulses, regardless of applications thereof, a technique for obtaining a high quality image is provided.In the technique, a 2-dimensional selective excitation sequence is carried out while changing a coefficient for determining the cylinder diameter of a region excited by the 2-dimensional selective excitation sequence and a time difference for determining an offset position.The obtained excitation region and a desired region are compared with each other, and the coefficient and time difference with which the obtained excitation region and the desired region match each other are determined to be the optimum ones.The determination processing may be performed as an initial adjustment, may be performed according to need in each imaging, or may be performed on a per-application basis.

摘要翻译： 可以根据每次成像中的需要执行确定处理作为初始调整，或者可以在每个应用的基础上执行。

公开(公告)号：US08742756B2

公开(公告)日：2014-06-03

申请号：US12996216

申请日：2009-06-09

申请人： Binrong Wu ,  Hiroyuki Itagaki ,  Takashi Nishihara

发明人： Binrong Wu ,  Hiroyuki Itagaki ,  Takashi Nishihara

IPC分类号： G01V3/00 ,  G01R33/48

CPC分类号： A61B5/055

摘要： An object is to enhance usability of parameter check when an imaging parameter is changed in multistation imaging, and easily obtain a desired image with high quality. In the multistation imaging, it is determined in a lump before imaging whether an image having desired quality is obtained by using the changed value of the imaging parameter, and the result is presented to an operator. The determination is executed in the order of “possible or impossible” determination of execution of imaging itself and “possible or impossible” determination of combination of obtained images. When it is determined that it is impossible to execute the imaging itself, the determination processing is finished. At this time, a recommended value may be presented.

摘要翻译： 一个目的是提高多成像成像参数改变时参数检测的可用性，并且可以很容易地获得高质量的所需图像。 在多状态成像中，在成像之前，通过使用成像参数的变化值来获得是否获得具有期望质量的图像，并且将结果呈现给操作者，确定一个块。 确定以“可能的或不可能的”确定成像本身的执行和“可能的或不可能的”确定所获得的图像的组合的顺序执行。 当确定不可能执行成像本身时，确定处理结束。 此时，可以显示推荐值。

公开(公告)号：US20120212223A1

公开(公告)日：2012-08-23

申请号：US13504590

申请日：2010-11-11

申请人： Takashi Nishihara ,  Hiroyuki Itagaki

发明人： Takashi Nishihara ,  Hiroyuki Itagaki

IPC分类号： G01R33/48

CPC分类号： G01R33/4828 ,  A61B5/055 ,  A61B5/4312 ,  A61B5/7257 ,  G01R33/4836

摘要： An MRI apparatus and a two-dimensional excitation adjustment method capable of performing appropriately two-dimensional excitation of a region, in which materials with different resonance frequencies are present, according to imaging conditions are provided. In order to do so, when performing the two-dimensional excitation of a two-dimensional excitation region of an object formed by a first material with a first resonance frequency and a second material with a second resonance frequency, an irradiation frequency of a high-frequency magnetic field for the two-dimensional excitation is set on the basis of the imaging conditions related to the two-dimensional excitation and the first and second resonance frequencies so that desired regions of the first and second materials are excited in a two-dimensional manner.

摘要翻译： 提供了能够根据成像条件对存在不同谐振频率的材料进行适当二维激励的MRI装置和二维激励调整方法。 为了这样做，当由具有第一共振频率的第一材料形成的物体的二维激发区域和具有第二共振频率的第二材料进行二维激发区域的二维激发时， 基于与二维激励和第一和第二共振频率相关的成像条件来设定用于二维激励的高频磁场，使得第一和第二材料的期望区域以二维方式被激发 。

公开(公告)号：US20120176132A1

公开(公告)日：2012-07-12

申请号：US13496916

申请日：2010-09-16

申请人： Takashi Nishihara ,  Hiroyuki Itagaki ,  Tomohiro Goto

发明人： Takashi Nishihara ,  Hiroyuki Itagaki ,  Tomohiro Goto

IPC分类号： G01R33/48

CPC分类号： A61B5/055 ,  A61B5/489 ,  G01R33/243 ,  G01R33/3875 ,  G01R33/446 ,  G01R33/4836

摘要： A high-quality image is obtained using a two-dimensional selective excitation method even if the static magnetic field is not uniform. Therefore, non-uniformity of a static magnetic field of a region to be focused in particular in a selective excitation region excited by 2DRF is measured, and a result of the measurement is reflected in an imaging sequence using the 2DRF. For example, a resonance frequency of magnetization obtained from the measurement result is set as an irradiation frequency of the 2DRF. In addition, a shim gradient magnetic field is applied so as to correct the non-uniformity of the magnetization obtained from the measurement result. These are applied only in the imaging sequence using the 2DRF, and an irradiation frequency and a shim gradient magnetic field set in a conventional method are used in other imaging sequences.

摘要翻译： 即使静态磁场不均匀，也可以使用二维选择激励法获得高质量的图像。 因此，特别是要被2DRF激发的选择性激发区域中的区域的静态磁场的不均匀性被测量，并且测量结果被反映在使用2DRF的成像序列中。 例如，将从测定结果得到的磁化的共振频率设定为2DRF的照射频率。 此外，施加垫片梯度磁场，以校正从测量结果获得的磁化的不均匀性。 这些仅在使用2DRF的成像序列中应用，并且在其他成像序列中使用常规方法中设置的照射频率和匀场梯度磁场。