公开(公告)号：US08952692B2

公开(公告)日：2015-02-10

申请号：US13157640

申请日：2011-06-10

申请人： Naho Takahashi ,  Masato Ikedo

发明人： Naho Takahashi ,  Masato Ikedo

IPC分类号： G01R33/483 ,  G01R33/565

CPC分类号： G01R33/483 ,  G01R33/5659

摘要： According to one embodiment, a magnetic resonance imaging apparatus includes an image generating unit, a judging unit and a correction unit. The image generating unit receives, from an object, a magnetic resonance signal caused by transmission of an RF pulse to cause a nuclear magnetic resonance, and generates image data of the object based on the magnetic resonance signal. The judging unit identifies an implant region where an implant part exists inside the object, based on the image data. The correction unit acquires magnetic resonance frequency information from a body region which is a region inside the object excluding the implant region, and corrects a center frequency of the RF pulse based on the magnetic resonance frequency information.

摘要翻译： 根据一个实施例，磁共振成像装置包括图像生成单元，判断单元和校正单元。 图像生成单元从对象接收由RF脉冲的发送引起的核磁共振引起的磁共振信号，并且基于磁共振信号生成对象的图像数据。 判断单元基于图像数据识别植入物部分存在于物体内部的植入区域。 校正单元从除了植入区域之外的物体内的身体区域获取磁共振频率信息，并且基于磁共振频率信息来校正RF脉冲的中心频率。

公开(公告)号：US20110304331A1

公开(公告)日：2011-12-15

申请号：US13157640

申请日：2011-06-10

申请人： Naho TAKAHASHI ,  Masato Ikedo

发明人： Naho TAKAHASHI ,  Masato Ikedo

IPC分类号： G01R33/48

CPC分类号： G01R33/483 ,  G01R33/5659

摘要： According to one embodiment, a magnetic resonance imaging apparatus includes an image generating unit, a judging unit and a correction unit. The image generating unit receives, from an object, a magnetic resonance signal caused by transmission of an RF pulse to cause a nuclear magnetic resonance, and generates image data of the object based on the magnetic resonance signal. The judging unit identifies an implant region where an implant part exists inside the object, based on the image data. The correction unit acquires magnetic resonance frequency information from a body region which is a region inside the object excluding the implant region, and corrects a center frequency of the RF pulse based on the magnetic resonance frequency information.

摘要翻译： 根据一个实施例，磁共振成像装置包括图像生成单元，判断单元和校正单元。 图像生成单元从对象接收由RF脉冲的发送引起的核磁共振引起的磁共振信号，并且基于磁共振信号生成对象的图像数据。 判断单元基于图像数据识别植入物部分存在于物体内部的植入区域。 校正单元从除了植入区域之外的物体内的身体区域获取磁共振频率信息，并且基于磁共振频率信息来校正RF脉冲的中心频率。

公开(公告)号：US10098563B2

公开(公告)日：2018-10-16

申请号：US11943765

申请日：2007-11-21

申请人： Tokunori Kimura ,  Masato Ikedo

发明人： Tokunori Kimura ,  Masato Ikedo

IPC分类号： A61B5/055 ,  A61B5/00 ,  G01R33/50 ,  G01R33/56 ,  G01R33/561 ,  G01R33/563

摘要： A magnetic resonance imaging apparatus includes an acquisition unit which acquires first data in which a tissue of interest has higher signal intensity than a background and second data in which the tissue of interest has lower signal intensity than the background, with regard to images of the same region of the same subject, and a generation unit which generates, on the basis of the first data and the second data, third data in which the contrast of the tissue of interest to the background is higher than those in the first and second data.

公开(公告)号：US07592812B2

公开(公告)日：2009-09-22

申请号：US11729841

申请日：2007-03-30

申请人： Masato Ikedo

发明人： Masato Ikedo

IPC分类号： G01V3/00

CPC分类号： G01R33/3875 ,  G01R33/243

摘要： A magnetic resonance imaging apparatus includes: a static magnetic field generating unit which generates a static magnetic field, a measuring unit which measures the strength distribution characteristic of the static magnetic field, a determination unit which determines correction amounts for first- to nth-order (n is a natural number of more than one) components of the strength distribution characteristic of the static magnetic field by fixing the correction amount for at least one specific component which are part of the first- to nth-order components at a predetermined amount and determining the correction amounts for other components than the specific component on the basis of the strength distribution characteristic, and a correction magnetic field generating unit which generates correction magnetic fields to correct the static magnetic field on the basis of the correction amounts.

摘要翻译： 磁共振成像装置包括：产生静磁场的静磁场产生单元，测量静磁场的强度分布特性的测量单元，确定第一到第n次校正量的确定单元（ n是静态磁场的强度分布特性的多个成分的自然数，通过将作为第一到第n阶分量的一部分的至少一个特定分量的校正量固定为预定量并确定 基于强度分布特性的比特定分量的其它成分的校正量，以及校正磁场产生单元，其基于校正量产生校正磁场以校正静磁场。

公开(公告)号：US10219721B2

公开(公告)日：2019-03-05

申请号：US12888239

申请日：2010-09-22

申请人： Tokunori Kimura ,  Masato Ikedo

发明人： Tokunori Kimura ,  Masato Ikedo

IPC分类号： A61B5/00 ,  A61B5/055 ,  G01R33/565 ,  G01R33/563 ,  G01R33/50 ,  G01R33/56 ,  G01R33/561

摘要： A magnetic resonance imaging apparatus includes an acquisition unit that acquires first data in which a tissue of interest has higher signal intensity than a background and second data in which the tissue of interest has lower signal intensity than the background, with regard to images of the same region of the same subject, and a generation unit that generates, on the basis of the first data and the second data, third data in which the contrast of the tissue of interest to the background is higher than those in the first and second data.

公开(公告)号：US20080119721A1

公开(公告)日：2008-05-22

申请号：US11943765

申请日：2007-11-21

申请人： Tokunori KIMURA ,  Masato Ikedo

发明人： Tokunori KIMURA ,  Masato Ikedo

IPC分类号： A61B5/05

CPC分类号： A61B5/055 ,  A61B5/417 ,  A61B5/489 ,  G01R33/50 ,  G01R33/5601 ,  G01R33/5607 ,  G01R33/5608 ,  G01R33/5616 ,  G01R33/56308 ,  G01R33/5635

摘要： A magnetic resonance imaging apparatus includes an acquisition unit which acquires first data in which a tissue of interest has higher signal intensity than a background and second data in which the tissue of interest has lower signal intensity than the background, with regard to images of the same region of the same subject, and a generation unit which generates, on the basis of the first data and the second data, third data in which the contrast of the tissue of interest to the background is higher than those in the first and second data.

摘要翻译： 磁共振成像装置包括获取单元，其获取其中感兴趣组织具有比背景更高的信号强度的第一数据，其中感兴趣的组织具有比背景更低的信号强度的第二数据，关于该图像的图像 区域，以及生成单元，其基于第一数据和第二数据生成第三数据，其中感兴趣组织对背景的对比度高于第一和第二数据中的对比度。

公开(公告)号：US07514929B2

公开(公告)日：2009-04-07

申请号：US11653430

申请日：2007-01-16

申请人： Shigehide Kuhara ,  Hirofumi Anno ,  Masato Ikedo

发明人： Shigehide Kuhara ,  Hirofumi Anno ,  Masato Ikedo

IPC分类号： G01V3/00

CPC分类号： G01R33/3875

摘要： A magnetic resonance imaging apparatus includes a collector which collects magnetic resonance signals emitted from a region of interest of a subject, and a correction magnetic field generator which generates a correction magnetic field to correct the nonuniformity of a static magnetic field on the basis of magnetic resonance signals which are contained in the magnetic resonance signals collected by the collector, are emitted from a specific region which forms a portion of the region of interest.

摘要翻译： 磁共振成像装置包括收集从受检者的感兴趣区域发射的磁共振信号的收集器和产生校正磁场的校正磁场发生器，以校正基于磁共振的静态磁场的不均匀性 包含在由收集器收集的磁共振信号中的信号从形成感兴趣区域的一部分的特定区域发射。

公开(公告)号：US20070035302A1

公开(公告)日：2007-02-15

申请号：US11404840

申请日：2006-04-17

申请人： Masato Ikedo ,  Masao Yui

发明人： Masato Ikedo ,  Masao Yui

IPC分类号： G01V3/00

CPC分类号： G01R33/56563

摘要： In a phase unwrapping evolution method according to the invention, steps of grouping phase data first, phase unwrapping evolution targeting groups is performed, and, then, merging of the target groups is performed are repeatedly applied. As unwrapping evolution processing proceeds, groups increase and information on a phase difference among the group increases. Thus, the influence of phase data that tends to be a cause of failure of unwrapping evolution gradually decreases and a result with higher robustness than the conventional method is obtained. In addition, a group once subjected to unwrapping evolution continues to be subjected to unwrapping evolution as a new group created by merging. Thus, even if a phase is decided once, the group is subjected to wrapping evolution many times in order to match the phase with phases of other groups. As a result, it is possible to prevent a series of occurrence of failure of unwrapping evolution. Failure of unwrapping evolution is reduced compared with the conventional method and stability of unwrapping evolution is improved.

摘要翻译： 在根据本发明的相位展开演进方法中，首先执行对相位数据进行分组的步骤，相位展开进化瞄准组，然后重复应用目标组的合并。 随着解卷进化处理的进行，组增加，组间相位差的信息增加。 因此，趋向于成为展开演化失败的原因的相位数据的影响逐渐减小，并且获得了比常规方法更高的鲁棒性的结果。 此外，一旦遭受解开演变的小组，将继续作为通过合并创建的新组合来展开演变。 因此，即使确定一次相位，也可以对组进行多次缠绕演算，以使其与其他组的相位相匹配。 结果，可以防止展开演化的一系列失败的发生。 展开演化的失败与传统方法相比有所降低，提高了展开演化的稳定性。

公开(公告)号：US20110071384A1

公开(公告)日：2011-03-24

申请号：US12888239

申请日：2010-09-22

申请人： Tokunori Kimura ,  Masato Ikedo

发明人： Tokunori Kimura ,  Masato Ikedo

IPC分类号： A61B5/055

CPC分类号： A61B5/055 ,  A61B5/417 ,  A61B5/489 ,  G01R33/50 ,  G01R33/5601 ,  G01R33/5607 ,  G01R33/5608 ,  G01R33/5616 ,  G01R33/56308 ,  G01R33/5635 ,  G01R33/56536

摘要： A magnetic resonance imaging apparatus includes an acquisition unit that acquires first data in which a tissue of interest has higher signal intensity than a background and second data in which the tissue of interest has lower signal intensity than the background, with regard to images of the same region of the same subject, and a generation unit that generates, on the basis of the first data and the second data, third data in which the contrast of the tissue of interest to the background is higher than those in the first and second data.

摘要翻译： 磁共振成像装置包括获取单元，其获取其中感兴趣的组织具有比背景更高的信号强度的第一数据，其中感兴趣组织的信号强度比背景的信号强度低的第二数据，关于图像的图像 区域，以及生成单元，其基于第一数据和第二数据生成第三数据，其中感兴趣组织对背景的对比度高于第一和第二数据中的对比度。

公开(公告)号：US20080071167A1

公开(公告)日：2008-03-20

申请号：US11898299

申请日：2007-09-11

申请人： Masato Ikedo ,  Tokunori Kimura

发明人： Masato Ikedo ,  Tokunori Kimura

IPC分类号： A61B5/05

CPC分类号： G01R33/56316 ,  G01R33/543 ,  G01R33/5602 ,  G01R33/5607 ,  G01R33/5611 ,  G01R33/5615 ,  G01R33/5635 ,  G01R33/56509 ,  G01R33/56545

摘要： A magnetic resonance imaging diagnostic apparatus includes a generating unit which generates a slice gradient magnetic field, a phase-encode gradient magnetic field and a read-out gradient magnetic field that extend in a slice axis, a phase-encode axis and a read-out axis, respectively, a setting unit which sets a dephase amount for weighting a signal-level decrease resulting from flows in the arteries and veins present in a region of interest of a subject, with respect to at least one axis selected form the slice axis, phase-encode axis and read-out axes, and a control unit which controls the generating unit by using a pulse sequence for a gradient echo system, which includes a dephase gradient-magnetic-field pulse that corresponds to the dephase amount set by the setting unit for the at least one axis.

摘要翻译： 磁共振成像诊断装置包括：生成单元，其生成切片梯度磁场，相位编码梯度磁场和读取梯度磁场，其在切片轴，相位编码轴和读出位置 设置单元，其设置相对于从切片轴选择的至少一个轴，对存在于对象的感兴趣区域的动脉和静脉中的流动而产生的信号电平降低进行加权的去相位量， 相位编码轴和读出轴;以及控制单元，其通过使用用于梯度回波系统的脉冲序列来控制生成单元，该梯度回波系统包括与由设定设定的去相位量对应的去相位梯度磁场脉冲 至少一个轴的单位。