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：US09662037B2

公开(公告)日：2017-05-30

申请号：US13354775

申请日：2012-01-20

申请人： Naho Takahashi ,  Masao Yui

发明人： Naho Takahashi ,  Masao Yui

IPC分类号： G01V3/00 ,  A61B5/055 ,  G01R33/48 ,  A61B5/00

CPC分类号： A61B5/055 ,  A61B5/0037 ,  G01R33/48

摘要： According to one embodiment, a magnetic resonance imaging apparatus includes a spectrum acquisition unit, a resonance frequency acquisition unit and an imaging unit. The spectrum acquisition unit is configured to acquire frequency spectra of magnetic resonance signals from an object while changing a suppression effect or an enhancing effect of signals from a specific material. The resonance frequency acquisition unit is configured to obtain a resonance frequency of the specific material or another material based on an index representing a difference in intensities of signals from the specific material or the another material between the frequency spectra. The imaging unit is configured to perform imaging using a radio frequency pulse having a center frequency set to the resonance frequency of the specific material or the another material.

公开(公告)号：US20090134871A1

公开(公告)日：2009-05-28

申请号：US12273718

申请日：2008-11-19

申请人： Masao Yui

发明人： Masao Yui

IPC分类号： G01R33/48

CPC分类号： G01R33/5635 ,  G01R33/5614 ,  G01R33/56316 ,  G01R33/56509 ,  G01R33/5673

摘要： A magnetic resonance imaging apparatus includes a data acquisition unit and an image generating unit. The data acquisition unit acquires MR data according to an imaging condition for obtaining a SSFP in flowing matter by applying excitation pulses having a same flip angle with a constant TR and gradient magnetic fields to an object. The image generating unit generates an image of the flowing matter based on the MR data.

摘要翻译： 磁共振成像装置包括数据获取单元和图像生成单元。 数据采集​​单元根据用于通过将具有相同翻转角的激励脉冲与常量TR和梯度磁场相关联的激发脉冲，根据用于获得流动物质中的SSFP的成像条件来获取MR数据。 图像生成单元基于MR数据生成流动物体的图像。

公开(公告)号：US20070066886A1

公开(公告)日：2007-03-22

申请号：US11231878

申请日：2005-09-22

申请人： Shigehide Kuhara ,  Masao Yui ,  Yoshimori Kassai

发明人： Shigehide Kuhara ,  Masao Yui ,  Yoshimori Kassai

IPC分类号： A61B5/05

CPC分类号： G01R33/5673

摘要： Scanning operation of acquiring data by repeating a scan based on the same encoding pattern at least once by using an R wave occurring at time T0 as a trigger is executed with respect to all encoding patterns. The necessary number of data for image reconstruction are extracted from MR data acquired by temporally retrospecting from the R wave occurrence time (time T1) next to the R wave (time T0) used as the trigger on the basis of the obtained data, data acquisition time information, and the R wave time. The extracted data are then rearranged to generate a data set for imaging the movement of the heart which is associated with end-diastole after the occurrence of the R wave used as the trigger, thereby performing image reconstruction.

摘要翻译： 针对所有编码模式执行通过使用在时间T 0出现的R波作为触发而至少通过一次重复基于相同编码模式的扫描来获取数据的扫描操作。 从R波旁边的R波发生时间（时间T 1> 1）通过时间回顾获取的MR数据中提取必要数量的用于图像重构的数据（时间T 0 ）用作基于所获得的数据，数据获取时间信息和R波时间的触发。 然后将所提取的数据重新排列，以产生用于对作为触发器的R波出现之后与舒张末期相关的心脏运动进行成像的数据组，从而进行图像重建。

公开(公告)号：US06567685B2

公开(公告)日：2003-05-20

申请号：US09764215

申请日：2001-01-19

申请人： Hiromitsu Takamori ,  Ayumi Katsunuma ,  Hitoshi Kanazawa ,  Takeshiro Suzuki ,  Seiji Nozaki ,  Masatoshi Hanawa ,  Yoshio Machida ,  Masaaki Yamanaka ,  Masao Yui

发明人： Hiromitsu Takamori ,  Ayumi Katsunuma ,  Hitoshi Kanazawa ,  Takeshiro Suzuki ,  Seiji Nozaki ,  Masatoshi Hanawa ,  Yoshio Machida ,  Masaaki Yamanaka ,  Masao Yui

IPC分类号： A61B505

CPC分类号： G01R33/3854

摘要： A magnetic resonance imaging apparatus generates an MR signal from an object by applying a gradient field pulse generated by a gradient field coil and a high-frequency magnetic field pulse generated by a high-frequency coil to the object in a static field, and reconstructs an image on the basis of the MR signal. The gradient field coil is housed in a sealed vessel. The internal air in the sealed vessel is exhausted by the pump to prevent noise. By controlling the operation of the pump using a control circuit, noise in imaging operation can be reduced more effectively.

摘要翻译： 磁共振成像装置通过将由梯度场线圈产生的梯度场脉冲和由高频线圈产生的高频磁场脉冲施加到静态场中的对象来生成来自对象的MR信号，并且重建 基于MR信号的图像。 梯度场线圈容纳在密封容器中。 密封容器中的内部空气被泵排出，以防止噪音。 通过使用控制电路控制泵的操作，可以更有效地降低成像操作中的噪声。

公开(公告)号：US09188656B2

公开(公告)日：2015-11-17

申请号：US13414073

申请日：2012-03-07

申请人： Masao Yui ,  Hiroshi Kusahara

发明人： Masao Yui ,  Hiroshi Kusahara

IPC分类号： G01R33/24 ,  G01R33/32 ,  G01R33/565 ,  G01R33/561

CPC分类号： G01R33/56518 ,  G01R33/5616

摘要： According to one embodiment, a magnetic resonance imaging apparatus includes a data acquisition unit, an eddy magnetic field measuring unit and an imaging unit. The data acquisition unit is configured to acquire magnetic resonance signals at mutually different timings with applying a gradient magnetic field for generating an eddy magnetic field. The eddy magnetic field measuring unit is configured to acquire eddy magnetic field information including a time constant of the eddy magnetic field based on phase information of the magnetic resonance signals acquired at the timings. The imaging unit is configured to perform imaging under an imaging condition or a data processing condition according to the eddy magnetic field information.

摘要翻译： 根据一个实施例，磁共振成像装置包括数据采集单元，涡流磁场测量单元和成像单元。 数据采集​​单元被配置为通过施加用于产生涡流磁场的梯度磁场在相互不同的定时获取磁共振信号。 涡电磁场测量单元被配置为基于在该定时获取的磁共振信号的相位信息来获取包括涡流磁场的时间常数的涡流磁场信息。 成像单元被配置为根据涡流磁场信息在成像条件或数据处理条件下执行成像。

公开(公告)号：US20120187948A1

公开(公告)日：2012-07-26

申请号：US13438141

申请日：2012-04-03

申请人： Yuichi YAMASHITA ,  Masao Yui

发明人： Yuichi YAMASHITA ,  Masao Yui

IPC分类号： G01R33/34

摘要： A magnetic resonance imaging apparatus according to an embodiment includes a first acquiring unit, a second acquiring unit, and a combining unit. The first acquiring unit is configured to acquire data by executing a pulse sequence based on a first radio-frequency pulse transmission condition. The second acquiring unit is configured to acquire data by executing a pulse sequence based on a second radio-frequency pulse transmission condition that is different from the first radio-frequency pulse transmission condition. The combining unit is configured to perform a combining process either on the data acquired by the first acquiring unit and the data acquired by the second acquiring unit or on data obtained by reconstructing the data acquired by the first acquiring unit and data obtained by reconstructing the data acquired by the second acquiring unit.

摘要翻译： 根据实施例的磁共振成像装置包括第一获取单元，第二获取单元和组合单元。 第一获取单元被配置为通过基于第一射频脉冲发送条件执行脉冲序列来获取数据。 第二获取单元被配置为通过基于与第一射频脉冲发送条件不同的第二射频脉冲发送条件执行脉冲序列来获取数据。 组合单元被配置为对由第一获取单元获取的数据和由第二获取单元获取的数据执行组合处理，或者通过重建由第一获取单元获取的数据而获得的数据和通过重建数据获得的数据 由第二收购单位收购。

公开(公告)号：US07825660B2

公开(公告)日：2010-11-02

申请号：US12076166

申请日：2008-03-14

申请人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

发明人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

IPC分类号： G01V3/00

CPC分类号： G01R33/56509 ,  G01R33/546 ,  G01R33/5614 ,  G01R33/5635 ,  G01R33/56518 ,  G01R33/5676

摘要： An MRI apparatus includes an imaging signal acquisition unit, a motion signal acquisition unit, a motion amount determination unit, a motion correction unit and an image reconstruction unit. The imaging signal acquisition unit acquires MR signals as imaging signals. The motion signal acquisition unit repetitively acquires MR signals having PE amount less than that of the imaging signals as motion signals. The motion amount determination unit obtains a motion amount using the motion signals. The motion correction unit performs correction processing of the imaging signals in accordance with the motion amount. The image reconstruction unit reconstructs an image using the imaging signals after the correction processing.

摘要翻译： MRI装置包括成像信号获取单元，运动信号获取单元，运动量确定单元，运动校正单元和图像重建单元。 成像信号获取单元获取MR信号作为成像信号。 运动信号获取单元重复获取具有小于成像信号的PE量的MR信号作为运动信号。 运动量确定单元使用运动信号获得运动量。 运动校正单元根据运动量进行摄像信号的校正处理。 图像重建单元使用校正处理之后的成像信号来重建图像。

公开(公告)号：US07579834B2

公开(公告)日：2009-08-25

申请号：US12076387

申请日：2008-03-18

申请人： Masao Yui

发明人： Masao Yui

IPC分类号： G01V3/00

CPC分类号： G01R33/5614 ,  G01R33/4824 ,  G01R33/4828 ,  G01R33/4835 ,  G01R33/5602 ,  G01R33/5607 ,  G01R33/5635 ,  G01R33/56366

摘要： A magnetic resonance imaging apparatus includes a data acquisition unit and an image data generating unit. The data acquisition unit acquires data according to a sequence derived by adding a coherent control pulse on a Steady-State Free Precession pulse sequence for repeating plural radio frequency excitations with a constant interval. The coherent control pulse has a center at a substantially center time between adjacent radio frequency excitations and a zero-order moment of which amount is zero. The image data generating unit generates image data based on the data.

公开(公告)号：US20080231271A1

公开(公告)日：2008-09-25

申请号：US12076166

申请日：2008-03-14

申请人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

发明人： Masao Yui ,  Yoshimori Kassai ,  Shigehide Kuhara

IPC分类号： G01R33/54

CPC分类号： G01R33/56509 ,  G01R33/546 ,  G01R33/5614 ,  G01R33/5635 ,  G01R33/56518 ,  G01R33/5676

摘要： An MRI apparatus includes an imaging signal acquisition unit, a motion signal acquisition unit, a motion amount determination unit, a motion correction unit and an image reconstruction unit. The imaging signal acquisition unit acquires MR signals as imaging signals. The motion signal acquisition unit repetitively acquires MR signals having PE amount less than that of the imaging signals as motion signals. The motion amount determination unit obtains a motion amount using the motion signals. The motion correction unit performs correction processing of the imaging signals in accordance with the motion amount. The image reconstruction unit reconstructs an image using the imaging signals after the correction processing.