利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

68 条记录 (耗时 0.028 秒)

    Magnetic resonance imaging method for moving object
    11.
    发明授权
    Magnetic resonance imaging method for moving object 失效
    用于移动物体的磁共振成像方法

    公开(公告)号：US5115812A

    公开(公告)日：1992-05-26

    申请号：US441972

    申请日：1989-11-28

    申请人： Koichi Sano ,  Akira Maeda ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    发明人： Koichi Sano ,  Akira Maeda ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    IPC分类号： G01R33/563 ,  G01R33/565 ,  G01R33/567

    CPC分类号： G01R33/56316 ,  G01R33/56509 ,  G01R33/56563

    摘要： To obtain a high quality image at a vascular area at high speed: (1) there is used a pulse sequence which includes a bipolar phase encoding magnetic field, dephases a stationary area, and does not generate the first order moment; (2) phase distortions are estimated from measured data and removed, without incorporating a new function for function fitting; and (3) the relationship between the application timing of a readout gradient magnetic field and the latest application time of the other slice selection and phase encoding magnetic fields is obtained using as its parameter the time T.sub.E from excitation to generation of an echo peak within a measurement signal, and using this relationship, the application timing T.sub.E is obtained which makes minimum the echo peak shift quantity.

    Image reconstructing device for use in magnetic resonance imaging apparatus
    12.
    发明授权
    Image reconstructing device for use in magnetic resonance imaging apparatus 失效
    用于磁共振成像装置的图像重建装置

    公开(公告)号：US4996480A

    公开(公告)日：1991-02-26

    申请号：US418224

    申请日：1989-10-06

    申请人： Akira Maeda ,  Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    发明人： Akira Maeda ,  Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    IPC分类号： G01R33/54 ,  A61B5/055 ,  G01R33/32 ,  G01R33/485 ,  G01R33/565

    CPC分类号： G01R33/56527 ,  G01R33/485

    摘要： A magnetic resonance signal is detected at a plurality of different periods of time in accordance with the phase shift of a plurality of chemical shift components while varying the intensity of a gradient magnetic field with time, a plurality of magnetic resonance signal thus obtained are used for estimating a magnetic resonance signal due to only a predetermined chemical shift component, the phase rotation of the predetermined chemical shift component is corrected in the estimated resonance signal, and further a blur due to chemical shift components other than the predetermined one is corrected to obtain a tomogram formed of only the predetermined chemical shift component. Alternatively, one measured resonance signal is modified by an image reconstruction algorithm peculiar to each of a plurality of chemical shift components, to obtain tomograms corresponding to the chemical shift components.

    摘要翻译： 在随时间变化梯度磁场的强度的同时，根据多个化学位移分量的相移，在多个不同的时间段检测磁共振信号，由此得到的多个磁共振信号用于 估计由于只有预定的化学位移分量而产生的磁共振信号，在估计的共振信号中校正预定化学位移分量的相位旋转，并且进一步校正由于除了预定的化学位移分量之外的化学位移分量的模糊以获得 仅由预定的化学位移分量形成的断层图像。 或者，通过对多个化学位移分量中的每一个特有的图像重构算法修改一个测量的共振信号，以获得对应于化学位移分量的断层图像。

    Image constructing device included in a magnetic resonance imaging apparatus
    13.
    发明授权
    Image constructing device included in a magnetic resonance imaging apparatus 失效
    包含在磁共振成像装置中的图像构成装置

    公开(公告)号：US4901021A

    公开(公告)日：1990-02-13

    申请号：US262282

    申请日：1988-10-25

    申请人： Akira Maeda ,  Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    发明人： Akira Maeda ,  Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    IPC分类号： G01R33/485 ,  G01R33/565

    CPC分类号： G01R33/485 ,  G01R33/56527

    摘要： A magnetic resonance signal is detected at a plurality of different periods of time in accordance with the phase shift of a plurality of chemical shift components while varying the intensity of a gradient magnetic field with time, a plurality of magnetic resonance signals thus obtained are used for estimating a magnetic resonance signal due to only a predetermined chemical shift component, the phase rotation of the predetermined chemical shift component is corrected in the estimated resonance signal, and further a blur due to chemical shift components other than the predetermined one is corrected to obtain a tomogram formed of only the predetermined chemical shift component. Alternatively, one measured resonance signal is modified by an image construction algorithm peculiar to each of a plurality of chemical shift components, to obtain tomograms corresponding to the chemical shift components.

    摘要翻译： 在随时间变化梯度磁场的强度的同时，根据多个化学位移分量的相移，在多个不同的时间段内检测磁共振信号，由此得到的多个磁共振信号用于 估计由于只有预定的化学位移分量而产生的磁共振信号，在估计的共振信号中校正预定化学位移分量的相位旋转，并且进一步校正由于除了预定的化学位移分量之外的化学位移分量的模糊以获得 仅由预定的化学位移分量形成的断层图像。 或者，一个测量的谐振信号通过多个化学位移分量中的每一个特有的图像构造算法进行修改，以获得对应于化学位移分量的断层图像。

    Method and apparatus for NMR imaging
    14.
    发明授权
    Method and apparatus for NMR imaging 失效
    NMR成像方法和装置

    公开(公告)号：US4905699A

    公开(公告)日：1990-03-06

    申请号：US92303

    申请日：1987-09-02

    申请人： Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    发明人： Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    IPC分类号： A61B5/055

    CPC分类号： A61B5/055 ,  A61B5/7257

    摘要： In order to permit the detection of a respiratory motion and an imaging synchronized with the respiration by an NMR imaging apparatus itself without any special hardware, a sequence for detecting the respiratory motion is repeated for a short time immediately before the measurement of an image signal to detect the position and speed of the respiratory motion, and a desired image signal is measured in synchronism with the detected position. Alternatively, the respiratory motion is detected immediately after the measurement of an image signal, and the measured image signal is corrected in accordance with the detected amount to obtain a desired image signal synchronized with the respiration.

    摘要翻译： 为了允许通过NMR成像设备本身检测呼吸运动和与呼吸同步的成像，而没有任何特殊的硬件，用于检测呼吸运动的顺序在测量图像信号之前的短时间内被重复到 检测呼吸运动的位置和速度，并且与检测到的位置同步地测量期望的图像信号。 或者，在测量图像信号之后立即检测呼吸运动，并且根据检测到的量校正测量的图像信号，以获得与呼吸同步的期望的图像信号。

    Method of magnetic resonance imaging
    16.
    发明授权
    Method of magnetic resonance imaging 失效
    磁共振成像方法

    公开(公告)号：US4942359A

    公开(公告)日：1990-07-17

    申请号：US301901

    申请日：1989-01-25

    申请人： Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    发明人： Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    IPC分类号： G01R33/54 ,  A61B5/055 ,  A61B10/00 ,  G01R33/28 ,  G01R33/32 ,  G01R33/563

    CPC分类号： G01R33/563

    摘要： An MR imaging method comprising detecting resonant signals from a portion including blood vessels by the three-dimensional imaging incorporating depthwise information, and performing subtraction, with respect to the signal data in each voxel in the complex number representation, between the image data obtained by adding the complex numbers in the projection direction and the image data obtained by adding the absolute values of the complex numbers in the projection direction, to extract the image of only the blood vessel.

    摘要翻译： 一种MR成像方法，包括通过包含深度信息的三维成像从包括血管的部分检测谐振信号，并且对于复数表示中的每个体素中的信号数据，通过添加获得的图像数据执行减法 投影方向上的复数和通过将投影方向上的复数的绝对值相加而获得的图像数据，以提取仅血管的图像。

    Multi-dimensional magnetic resonance imaging method and apparatus for same
    17.
    发明授权
    Multi-dimensional magnetic resonance imaging method and apparatus for same 失效
    多维磁共振成像方法及装置相同

    公开(公告)号：US5275164A

    公开(公告)日：1994-01-04

    申请号：US386380

    申请日：1989-07-28

    申请人： Akira Maeda ,  Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    发明人： Akira Maeda ,  Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    IPC分类号： G01R33/54 ,  A61B5/055 ,  G01R33/32 ,  G01R33/56 ,  G01R33/561 ,  G01R33/567 ,  G06T11/00

    CPC分类号： G01R33/5673 ,  G01R33/56 ,  G01R33/561

    摘要： A method and apparatus for MRI imaging capable of reducing the time between end of measurement and completion of image reconstruction by performing part of image reconstruction calculation in parallel with measurement of magnetic resonance signals, which particularly performs image reconstruction calculation up to (N-1) dimensions of N-dimensional image reconstruction calculation in parallel with measurement of signals and performs the image reconstruction calculation for the remaining one-dimensional direction after the measurement has been finished. When calculation for the last one dimension is performed, the (N-1)-dimensional images for which image reconstruction has been completed are successively displayed, and the image reconstruction calculation for the remaining one-dimensional direction is carried out not by FFT but by discrete Fourier transform, or such that the order of signal measurement is made in the bit reversed order for the order of phase encoding quantity, and thereby, a further portion of the image reconstruction calculation is carried out in parallel with the signal measurement.

    摘要翻译： 一种用于MRI成像的方法和装置，其能够通过与磁共振信号的测量并行地执行图像重建计算的一部分来减少测量结束和完成图像重建之间的时间，其特别地执行直到（N-1）的图像重建计算， 与维度信号并行地进行N维图像重建计算的尺寸，并且在测量完成之后对剩余的一维方向执行图像重建计算。 当执行最后一个维度的计算时，连续地显示已经完成图像重建的（N-1）维图像，并且不通过FFT进行剩余一维方向的图像重建计算，而是通过 离散傅里叶变换，或者相位编码量的顺序，以比特相反的顺序进行信号测量的顺序，从而与信号测量并行地进行图像重构计算的另一部分。

    Method and apparatus for body motion corrective imaging
    18.
    发明授权
    Method and apparatus for body motion corrective imaging 失效
    身体运动矫正成像的方法和装置

    公开(公告)号：US5254948A

    公开(公告)日：1993-10-19

    申请号：US660084

    申请日：1991-02-25

    申请人： Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    发明人： Koichi Sano ,  Tetsuo Yokoyama ,  Hideaki Koizumi

    IPC分类号： G01R33/567 ,  G01V3/00

    CPC分类号： G01R33/5676

    摘要： In order to eliminate the degradation of NMR image caused by a body motion due to breathing or the like, one of measured image signals is selected as a reference, correlation is calculated between each measured image signal and the reference, and the image signal is modified on the basis of the value of correlation.

    摘要翻译： 为了消除由于呼吸等引起的身体运动引起的NMR图像的劣化，选择测量图像信号之一作为参考，在每个测量的图像信号和参考之间计算相关性，并且图像信号被修改 在相关性的基础上。

    Method and apparatus for reducing image noises
    19.
    发明授权
    Method and apparatus for reducing image noises 失效
    降低图像噪声的方法和装置

    公开(公告)号：US5113137A

    公开(公告)日：1992-05-12

    申请号：US579581

    申请日：1990-09-10

    申请人： Hideaki Koizumi ,  Koichi Sano ,  Tetsuo Yokoyama ,  Kazuya Sukegawa

    发明人： Hideaki Koizumi ,  Koichi Sano ,  Tetsuo Yokoyama ,  Kazuya Sukegawa

    IPC分类号： G01R33/32 ,  A61B5/055 ,  A61B6/02 ,  G01R33/56 ,  H05G1/60

    CPC分类号： G01R33/56 ,  A61B6/022 ,  H05G1/60

    摘要： There is provided an image noise reduction method for improving the signal-to-noise ratio of an image when observed. The image signal of an identical region is measured twice at different times. Images obtained by respective measurements and seen from an identical visual point are so juxtaposed on an identical plane as to form two sheets. By seeing the two sheets of images with parallax changed directly or through stereo glass, the effective signal components of the images are focused on the same plane whereas only noise components are dispersed in a direction perpendicular to the plane.

    摘要翻译： 提供了一种用于在观察时改善图像的信噪比的图像噪声降低方法。 相同区域的图像信号在不同时间测量两次。 通过各自的测量得到的图像和从相同的视点观察到的图像被并置在相同的平面上以形成两张纸。 通过直视或立体玻璃观看视差的两张图像，图像的有效信号分量聚焦在同一平面上，而只有噪声分量在垂直于平面的方向上分散。