公开(公告)号：US08027713B2

公开(公告)日：2011-09-27

申请号：US10474313

申请日：2002-04-11

申请人： Yumiko Yatsui ,  Tetsuhiko Takahashi

发明人： Yumiko Yatsui ,  Tetsuhiko Takahashi

IPC分类号： A61B5/05

CPC分类号： G01R33/56563 ,  G01R33/4828

摘要： A magnetic resonance imaging apparatus having control unit for fetching a plurality of image data and obtaining an image by a calculation. The control unit performs an unwrap processing to a plurality of regions for removing a main value of a phase rotation amount so as to obtain a distribution diagram of a phase rotation amount caused by magnetostatic unevenness, obtains a plurality of evaluation values based on the phase value between a plurality of regions, selects a desired evaluation value based on the phase value from the plurality of evaluation values, and adjusts the phase values between the regions in accordance with the desired evaluation value.

摘要翻译： 一种磁共振成像设备，具有用于取出多个图像数据并通过计算获得图像的控制单元。 控制单元对多个区域执行解包处理，以消除相位旋转量的主值，以获得由静磁不均匀引起的相位旋转量的分布图，基于相位值获得多个评估值 在多个区域之间，基于来自多个评估值的相位值选择期望的评估值，并根据期望的评价值调整各区域之间的相位值。

公开(公告)号：US07847549B2

公开(公告)日：2010-12-07

申请号：US12159177

申请日：2006-12-26

申请人： Tetsuhiko Takahashi ,  Takayuki Abe ,  Hisako Nagao

发明人： Tetsuhiko Takahashi ,  Takayuki Abe ,  Hisako Nagao

IPC分类号： G01V3/00

CPC分类号： G01R33/56375 ,  A61B5/0555 ,  A61B5/7257 ,  G01R33/56383 ,  G01R33/5676

摘要： A magnetic resonance imaging apparatus comprises object placing means for placing an object in an imaging space, translating means for translating the object in a given direction by translating the object placing means in the given direction continuously or step-wise, magnetic field generating means for exciting the desired region of the object by generating a static magnetic field, a gradient magnetic field in the imaging space, and a high-frequency magnetic field in the imaging space, signal detecting means for detecting a magnetic resonance signal from the object, and control unit for controlling the translating means, magnetic field generating means and the signal detecting means, and translating the object continuously or stepwise to a predetermined position at a predetermined speed so as to capture a magnetic resonance image of the object.The magnetic resonance imaging apparatus further comprises translation error detecting means for detecting an error of the position or the set value of the speed, and correcting means for correcting the error detected by the positional error detecting means.

摘要翻译： 磁共振成像装置包括用于将物体放置在成像空间中的物体放置装置，用于通过沿着给定方向连续或逐步平移物体放置装置在给定方向上平移物体的平移装置，用于激发 通过产生静态磁场，成像空间中的梯度磁场和成像空间中的高频磁场来产生物体的期望区域，用于检测来自物体的磁共振信号的信号检测装置，以及控制单元 用于控制平移装置，磁场产生装置和信号检测装置，并以预定速度将物体连续或逐步地转移到预定位置，以便捕获物体的磁共振图像。 磁共振成像装置还包括用于检测位置误差或速度设定值的平移误差检测装置，以及用于校正由位置误差检测装置检测到的误差的校正装置。

公开(公告)号：US20100244823A1

公开(公告)日：2010-09-30

申请号：US12295160

申请日：2007-03-12

申请人： Takayuki Abe ,  Tetsuhiko Takahashi

发明人： Takayuki Abe ,  Tetsuhiko Takahashi

IPC分类号： G01R33/48

CPC分类号： G01R33/56375 ,  A61B5/055 ,  G01R33/243 ,  G01R33/543 ,  G01R33/56383 ,  G01R33/56563 ,  G01R33/58

摘要： A magnetic resonance imaging apparatus comprising static magnetic field generating means for generating a static magnetic field in an imaging space, measuring means for generating a high-frequency magnetic field and a gradient magnetic field in the imaging space and measuring a nuclear magnetic resonance signal generated from an object to be examined placed in the imaging space, signal processing means for reconstructing a magnetic resonance image according to the nuclear magnetic resonance signal, control means for controlling the measuring means and the signal processing means, and display means for displaying the reconstructed magnetic resonance image obtained by the signal processing means.The magnetic resonance imaging apparatus further comprises storing means for storing a first set of information representing an inhomogeneous distribution of the static magnetic field generated depending on the characteristic of the static magnetic field generating means and a second set of information representing an inhomogeneous distribution of the static magnetic field generated depending on the tissue of the object, setting means for setting a field of view for imaging in a desired region of the object, selecting means for selecting information corresponding to the set field of view for imaging out of the second set of information as a third set of information, and correcting magnetic field generating means for generating a correcting magnetic field according to the third set of information and the first set of the information.

摘要翻译： 一种磁共振成像设备，包括用于在成像空间中产生静态磁场的静态磁场产生装置，用于在所述成像空间中产生高频磁场和梯度磁场的测量装置，并且测量由 将要检查的物体放置在成像空间中，用于根据核磁共振信号重建磁共振图像的信号处理装置，用于控制测量装置和信号处理装置的控制装置，以及显示重建磁共振 由信号处理装置获得的图像。 磁共振成像装置还包括存储装置，用于存储表示根据静磁场产生装置的特性产生的静态磁场的不均匀分布的第一组信息，以及第二组信息，其表示静态磁场的不均匀分布 根据物体的组织产生的磁场，用于在对象的期望区域中设置用于成像的视野的设置装置，用于从第二组信息中选择与用于成像的设定视野相对应的信息的选择装置 作为第三组信息，以及校正磁场产生装置，用于根据第三组信息和第一组信息产生校正磁场。

公开(公告)号：US07768263B2

公开(公告)日：2010-08-03

申请号：US12331005

申请日：2008-12-09

申请人： Hisako Nagao ,  Takayuki Abe ,  Tetsuhiko Takahashi ,  Masahiro Takizawa

发明人： Hisako Nagao ,  Takayuki Abe ,  Tetsuhiko Takahashi ,  Masahiro Takizawa

IPC分类号： G01V3/00

CPC分类号： A61B5/055 ,  G01R33/56375

摘要： A magnetic resonance imaging apparatus comprises static magnetic field generating means for generating a static magnetic field in an imaging space, a gradient magnetic field generating means for generating a gradient magnetic field in the imaging space, high-frequency magnetic field generating means for generating a high-frequency magnetic field so as to induce nuclear magnetic resonance in a subject placed in the imaging space, signal receiving means for detecting a nuclear magnetic resonance signal from the subject, signal processing means for reconstructing an image by using the detected nuclear magnetic resonance signal, display means for displaying the image, a table for placing the subject thereon to dispose the subject in the imaging means, and table moving means for moving the table on which the subject is placed.While moving the portions to be imaged of the subject continuously or stepwise in the imaging space and disposing the subject, a whole-body image of a large region of the subject is created.The magnetic resonance imaging apparatus further comprises means for detecting information on the displacement of the subject from a desired position and setting means for setting movement information on the table according to the displacement information.The table moving means moves the table according to the movement information set by the setting means to capture the whole-body image.

摘要翻译： 磁共振成像装置包括用于在成像空间中产生静磁场的静磁场产生装置，用于在成像空间中产生梯度磁场的梯度磁场产生装置，用于产生高电平的高频磁场产生装置 频率磁场，以便在放置在成像空间中的对象中引起核磁共振，用于检测来自对象的核磁共振信号的信号接收装置，用于通过使用检测到的核磁共振信号重建图像的信号处理装置， 用于显示图像的显示装置，用于将被摄体放置在其上以将被摄体置于成像装置中的台子以及用于移动放置被摄体的台的台移动装置。 在成像空间中连续或逐步移动被摄体的成像部分并配置被摄体的同时，创建被检体的大区域的全身图像。 磁共振成像装置还包括用于检测来自所需位置的被摄体的位移的信息的装置和用于根据位移信息设置在桌子上的移动信息的设定装置。 桌子移动装置根据由设置装置设置的移动信息移动桌子以捕获全身图像。

公开(公告)号：US20100141253A1

公开(公告)日：2010-06-10

申请号：US11996865

申请日：2006-07-25

申请人： Masahiro Takizawa ,  Tetsuhiko Takahashi

发明人： Masahiro Takizawa ,  Tetsuhiko Takahashi

IPC分类号： G01R33/48

CPC分类号： G01R33/561 ,  G01R33/4824 ,  G01R33/56375 ,  G01R33/56383 ,  G01R33/56518 ,  G01R33/56563 ,  G01R33/56572

摘要： An MRI apparatus includes an imaging means being provided with a means for generating magnetic fields respectively of a static magnetic field, a gradient magnetic field, and an RF magnetic field, and a means for receiving an echo signal generated from a subject, the imaging means being for measuring echo data associated with at least one measurement trajectory in k-space, while varying angles with respect to a coordinate axis in the k-space of the measurement trajectory, so as to collect at least one measured data for each of the angles; and an image reconstruction means for rearranging the measured data in the k-space and reconstructing an image; wherein, the image reconstruction means calculates a phase for correction based on standard data selected from the measured data for each of the angles, prior to rearranging the measured data in the k-space, and performs a phase correction as to the measured data, by using the phase for correction being calculated. With the procedure above, it is possible to reduce an artifact caused by the nonlinearity of the gradient magnetic field and/or inhomogeneities of the magnetic field, without extending the imaging time.

摘要翻译： MRI装置包括成像装置，其具有分别产生静磁场，梯度磁场和RF磁场的磁场的装置，以及用于接收从被摄体产生的回波信号的装置，所述成像装置 用于测量与k空间中的至少一个测量轨迹相关联的回波数据，同时相对于测量轨迹的k空间中的坐标轴改变角度，以便针对每个角度收集至少一个测量数据 ; 以及图像重建装置，用于重新排列k空间中的测量数据并重构图像; 其特征在于，所述图像重构单元在重新排列所述k空间内的测量数据之前，根据从所测量的每个角度的数据中选出的标准数据，计算出校正相位，并对所述测量数据进行相位修正， 使用校正相位进行计算。 通过上述过程，可以减少由梯度磁场的非线性引起的伪影和/或磁场的不均匀性，而不会延长成像时间。

公开(公告)号：US20090012385A1

公开(公告)日：2009-01-08

申请号：US11664893

申请日：2005-10-12

申请人： Masahiro Takizawa ,  Tetsuhiko Takahashi

发明人： Masahiro Takizawa ,  Tetsuhiko Takahashi

IPC分类号： A61B5/055

CPC分类号： G01R33/56375 ,  A61B5/055 ,  A61B5/7257 ,  G01R33/4833 ,  G01R33/4835 ,  G01R33/56383

摘要： A magnetic resonance imaging apparatus including signal receiving means for detecting a nuclear magnetic resonance signal from an object, signal processing means for reconstructing an image by using the detected nuclear magnetic resonance signal and display means for displaying the image, a whole image of the examiner being obtained while each imaging site of the object is continuously or stepwise moved and disposed in the imaging space, is equipped with detecting means for detecting the gradient and size of each site of the object, inputting means for inputting reference information for carrying out magnetic resonance imaging corresponding to the gradient and size of each site of the object onto an image representing the gradient and size of each site of the object which is displayed on the display means, storage means for storing the input reference information, control means for controlling the imaging operation on the basis of the reference information stored in the storage means, and combining means for combining nuclear magnetic resonance signals obtained through the imaging operation carried out under the control to create the whole image.

摘要翻译： 一种磁共振成像装置，包括用于检测来自物体的核磁共振信号的信号接收装置，用于通过使用检测到的核磁共振信号重建图像的信号处理装置和用于显示图像的显示装置，检查器的整个图像为 在物体的每个成像部位被连续或逐步移动和放置在成像空间中时获得的装备有用于检测物体的每个部位的梯度和尺寸的检测装置，用于输入用于执行磁共振成像的参考信息的输入装置 对应于物体的每个位置的梯度和尺寸到表示显示在显示装置上的物体的每个位置的梯度和尺寸的图像，用于存储输入参考信息的存储装置，用于控制成像操作的控制装置 基于存储在存储装置中的参考信息， 以及用于组合通过在控制下执行的成像操作获得的核磁共振信号以组合整个图像的组合装置。

公开(公告)号：US07450982B2

公开(公告)日：2008-11-11

申请号：US10549340

申请日：2004-03-12

申请人： Takayuki Abe ,  Tetsuhiko Takahashi

发明人： Takayuki Abe ,  Tetsuhiko Takahashi

IPC分类号： A61B5/055

CPC分类号： G01R33/5676 ,  G01R33/563

摘要： A magnetic resonance imaging system is provided wherein measurement data (k space data) is extracted easily (and instantaneously) after imaging a plurality of times phases, and an image can be displayed in dynamic MRA measurement employing a contrast medium. Dynamic measurement is carried out, including extracting the time phase evaluation values (e.g. the origin data in k space) in respective time phases and then automatically extracting a data set including a time phase where the time phase evaluation value reaches a specified threshold value.

摘要翻译： 提供了一种磁共振成像系统，其中在成像多个阶段之后容易地（并且瞬间）提取测量数据（k空间数据），并且可以使用造影剂在动态MRA测量中显示图像。 执行动态测量，包括在各个时间段中提取时间相位评估值（例如，k空间中的原始数据），然后自动提取包括时间相位评估值达到指定阈值的时间相位的数据集。

公开(公告)号：US20080009710A1

公开(公告)日：2008-01-10

申请号：US11883700

申请日：2006-02-07

申请人： Hiroyuki Itagaki ,  Tetsuhiko Takahashi

发明人： Hiroyuki Itagaki ,  Tetsuhiko Takahashi

IPC分类号： A61B5/055

CPC分类号： G01R33/4836 ,  G01R33/446 ,  G01R33/4835

摘要： A magnetic resonance imaging method includes a step (1) for exciting atomic nuclei in a desired region of an object to be examined so as to cause nuclear magnetic resonance, a step (2) for detecting a nuclear magnetic resonance signal generated in the blood, and a step (3) for extracting a blood image of the object by the detected nuclear magnetic resonance signal. The desired region excited by the step (1) represents a plurality of regions arranged at a predetermined interval.

摘要翻译： 磁共振成像方法包括：步骤（1），用于激发待检测物体的期望区域中的原子核以引起核磁共振;步骤（2），用于检测在血液中产生的核磁共振信号， 以及用于通过检测到的核磁共振信号提取物体的血液图像的步骤（3）。 由步骤（1）激发的期望区域表示以预定间隔布置的多个区域。

公开(公告)号：US07224163B2

公开(公告)日：2007-05-29

申请号：US10511964

申请日：2003-04-22

申请人： Masahiro Takizawa ,  Tetsuhiko Takahashi

发明人： Masahiro Takizawa ,  Tetsuhiko Takahashi

IPC分类号： G01V3/00

CPC分类号： G01R33/5611

摘要： A first pulse sequence is executed on an imaging portion of an object to be examined using a multiple receiving coils including a plurality of receiving coils to obtain sensitivity images 701 to 703, each of n in number, which is smaller than the number of examination image. When those sensitivity images are calculated, NMR signals are measured only in a low-frequency region of a k space. Next, a second pulse sequence is executed while phase encoding steps are thinned out to acquire examination images 704 and 705, each of m in number (m>n), of the object with each receiving coil. When sensitivity distributions 707 and 708 are generated on the basis of sensitivity images 701 to 703, if a sensitivity distribution on a slice corresponding to examination images 704 and 705 is not yet measured, it is calculated with a slice interpolation processing on the basis of sensitivity distributions 701 to 703, and an aliasing artifact in examination images 704 and 705 are removed using sensitivity distributions 707 and 708 with a matrix calculation.

摘要翻译： 使用包括多个接收线圈的多个接收线圈在待检查对象的成像部分上执行第一脉冲序列，以获得灵敏度图像701至703，每个n个数量小于检查图像的数量 。 当计算出这些灵敏度图像时，仅在k空间的低频区域中测量NMR信号。 接下来，执行第二脉冲序列，同时减少相位编码步骤以获取具有每个接收线圈的物体的数量（m> n）中的每一个的检查图像704和705。 当灵敏度分布707和708基于灵敏度图像701至703生成时，如果尚未测量与检查图像704和705相对应的切片上的灵敏度分布，则以基于灵敏度的切片内插处理来计算 分布701至703，并且使用具有矩阵计算的灵敏度分布707和708来去除检查图像704和705中的混叠伪影。

公开(公告)号：US06777934B2

公开(公告)日：2004-08-17

申请号：US10148469

申请日：2002-09-05

申请人： Tetsuhiko Takahashi ,  Masahiro Takizawa

发明人： Tetsuhiko Takahashi ,  Masahiro Takizawa

IPC分类号： G01V300

CPC分类号： G01R33/5611 ,  G01R33/5619

摘要： An MRI apparatus is provided for obtaining an image of a wide area using a multiple-coil, where a plural number of small receiving coils are arranged such that adjacent coils overlap spatially. An image is picked up while thinning a part of the measured data, such that the low spatial frequency region of the k space is dense and the high spatial frequency region thereof is sparse. The substantial sensitivity distribution of each small receiving coil is determined using data related to the low spatial frequency region, and an image is composed using the sensitivity distribution and the measured data to produce a high resolution image having no aliasing artifact in a short time.

摘要翻译： 提供一种MRI装置，用于使用多个线圈获得广域的图像，其中多个小的接收线圈被布置成使得相邻的线圈在空间上重叠。 拾取图像，同时使测量数据的一部分变薄，使得k空间的低空间频率区域是致密的，并且其高空间频率区域是稀疏的。 使用与低空间频率区域相关的数据来确定每个小接收线圈的实质灵敏度分布，并且使用灵敏度分布和测量数据构成图像以在短时间内产生不具有混叠伪影的高分辨率图像。