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1.发明申请公开(公告)号：US20110245655A1
公开(公告)日：2011-10-06
申请号：US13139041
申请日：2009-12-22
IPC分类号： A61B5/055
CPC分类号： G01R33/565 , G01R33/4816 , G01R33/4833
摘要： When executing an imaging pulse sequence using a high frequency magnetic field pulse with a partial waveform of a predetermined waveform, an application start time of a slice gradient magnetic field applied simultaneously with the high frequency magnetic field pulse is corrected. Specifically, a magnetic resonance signal for correcting the imaging pulse sequence is acquired by executing a prescan sequence using a high frequency magnetic field pulse with a predetermined waveform, an application start time of a slice selection gradient magnetic field in the imaging pulse sequence is corrected using the magnetic resonance signal for correction, and the imaging pulse sequence is executed by applying the slice selection gradient magnetic field with the corrected application start time.
摘要翻译： 当使用具有预定波形的部分波形的高频磁场脉冲执行成像脉冲序列时，校正与高频磁场脉冲同时施加的切片梯度磁场的施加开始时间。 具体地，通过使用具有预定波形的高频磁场脉冲执行预扫描序列来获取用于校正成像脉冲序列的磁共振信号，使用成像脉冲序列中的切片选择梯度磁场的施加开始时间来校正使用 用于校正的磁共振信号和成像脉冲序列通过应用具有校正的应用开始时间的切片选择梯度磁场来执行。
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公开(公告)号：US20120141007A1
公开(公告)日：2012-06-07
申请号：US13389620
申请日：2010-08-02
IPC分类号： G06K9/00
CPC分类号： A61B5/055 , A61B5/0402 , A61B5/0816 , A61B5/7207 , A61B5/7285 , G01R33/482 , G01R33/4824 , G01R33/5617 , G01R33/5673
摘要： An image with a desired contrast is obtained while suppressing body motion artifacts caused by both random motion and periodic motion of an object. In order to do so, an imaging sequence using a non-Cartesian sampling method is executed so as to synchronize with a biological signal only at the start time and a repetition time (TR), which is an execution interval between shots within the imaging sequence, is maintained. In addition, a time difference between a delay time and a start time of each shot is calculated, and a shot with a predetermined time difference or more is executed again after the TR time.
摘要翻译： 获得具有期望对比度的图像，同时抑制由对象的随机运动和周期性运动引起的身体运动伪影。 为了这样做，执行使用非笛卡尔采样方法的成像序列，以便仅在开始时与生物信号同步，并且重复时间（TR）是成像序列内的拍摄之间的执行间隔 ，维持。 此外，计算出每个镜头的延迟时间和开始时间之间的时间差，并且在TR时间之后再次执行具有预定时间差的镜头。
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3.发明授权Magnetic resonance imaging apparatus and method with adjustment in positioning within imaging space to correct deviation from desired position 有权磁共振成像装置和方法，其调整成像空间内的定位以校正与期望位置的偏差公开(公告)号：US07486076B2
公开(公告)日：2009-02-03
申请号：US11662108
申请日：2005-09-02
IPC分类号： G01V3/00
CPC分类号： A61B5/055 , G01R33/56375
摘要： An MRI apparatus and method are provided which are capable of properly setting imaging position of regions of a subject on a table and moving the table to the set positions, for imaging a wide range or the entire body range of the subject.
摘要翻译： 提供了一种MRI装置和方法，其能够将桌子上的区域的成像位置适当地设置在桌子上并将桌子移动到设定位置，以对被摄体的宽范围或整个身体范围进行成像。
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公开(公告)号：US08855392B2
公开(公告)日：2014-10-07
申请号：US13389620
申请日：2010-08-02
IPC分类号： G06K9/00 , A61B5/055 , A61B5/00 , G01R33/567 , A61B5/0402 , A61B5/08 , G01R33/48 , G01R33/561
CPC分类号： A61B5/055 , A61B5/0402 , A61B5/0816 , A61B5/7207 , A61B5/7285 , G01R33/482 , G01R33/4824 , G01R33/5617 , G01R33/5673
摘要： An image with a desired contrast is obtained while suppressing body motion artifacts caused by both random motion and periodic motion of an object. In order to do so, an imaging sequence using a non-Cartesian sampling method is executed so as to synchronize with a biological signal only at the start time and a repetition time (TR), which is an execution interval between shots within the imaging sequence, is maintained. In addition, a time difference between a delay time and a start time of each shot is calculated, and a shot with a predetermined time difference or more is executed again after the TR time.
摘要翻译： 获得具有期望对比度的图像，同时抑制由对象的随机运动和周期性运动引起的身体运动伪影。 为了这样做，执行使用非笛卡尔采样方法的成像序列，以便仅在开始时与生物信号同步，并且重复时间（TR）是成像序列内的拍摄之间的执行间隔 ，维持。 此外，计算出每个镜头的延迟时间和开始时间之间的时间差，并且在TR时间之后再次执行具有预定时间差的镜头。
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公开(公告)号：US07768263B2
公开(公告)日：2010-08-03
申请号：US12331005
申请日：2008-12-09
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。
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公开(公告)号：US08032201B2
公开(公告)日：2011-10-04
申请号：US11917689
申请日：2006-06-15
IPC分类号： A61B5/05
CPC分类号： G01R33/56375 , A61B5/055 , A61B6/5241 , G01R33/5608 , G01R33/56383 , G06T3/0075
摘要： The magnetic resonance imaging apparatus includes a control unit for controlling a pulse sequence that applies an RF magnetic field and a magnetic field gradient to a subject placed in a static magnetic field and detects a magnetic resonance signal generated from the subject, and a calculation unit for processing the signal, and the control unit performs the process including the steps of; (1) obtaining first images at different positions in a first direction, (2) obtaining images after the first images are subjected to correction of brightness distortion, (3) obtaining images after the images as to which the brightness distortion has been corrected are further subjected to correction of positional distortion, and (4) synthesizing by a weighting calculation, overlapping areas of the images, after the positional distortion thereof has been corrected. According to this magnetic resonance imaging apparatus, the positional distortion and the brightness distortion can be corrected upon connecting the images, in the multi-station imaging.
摘要翻译： 磁共振成像装置包括：控制单元，用于控制对放置在静态磁场中的被摄体施加RF磁场和磁场梯度的脉冲序列，并检测从对象产生的磁共振信号;以及计算单元， 处理信号，并且控制单元执行包括以下步骤的处理： （1）在第一方向上获取不同位置的第一图像，（2）在第一图像经受亮度失真校正之后获得图像，（3）获得图像之后的亮度失真已被校正的图像进一步获得 进行位置失真的校正，（4）通过加权计算合成图像的重叠区域，在其位置失真被校正之后。 根据该磁共振成像装置，在多台成像中，可以在连接图像时校正位置失真和亮度失真。
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公开(公告)号：US20110089948A1
公开(公告)日：2011-04-21
申请号：US12912385
申请日：2010-10-26
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。
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8.发明申请公开(公告)号：US20100087729A1
公开(公告)日：2010-04-08
申请号：US12523343
申请日：2008-02-01
IPC分类号： A61B5/055
CPC分类号： A61B5/055 , A61B5/7285 , G01R33/5616 , G01R33/56375 , G01R33/56383 , G01R33/5673
摘要： When multiple types of imaging are performed while moving a table on which a subject to be examined is placed, an imaging efficiency is improved and a high-quality image is obtained within a short time. Therefore, within a predetermined time interval such as an identical period of a periodic living body motion, a predetermined number of echo signals from each of the multiple types of imaging sequences are acquired and the table on which the subject to be examined is placed is moved. Along with the movement of the table, data items within the same range in the Ky-direction as to each of the imaging sequences are acquired, the moving speed of the table is controlled in such a manner that the acquired data items become continuous in the x-direction, and images are reconstructed based on the data items obtained respectively from the imaging sequences.
摘要翻译： 当在移动要被检查对象的表格的同时执行多种类型的成像时，提高成像效率并且在短时间内获得高质量图像。 因此，在诸如周期性生物体运动的相同周期的预定时间间隔内，获取来自多种类型的成像序列中的每一种的预定数量的回波信号，并且移动放置被检查对象的表 。 随着桌子的移动，获取与每个成像序列相同的Ky方向上的数据项，表格的移动速度被控制成使获取的数据项在 x方向，并且基于从成像序列分别获得的数据项重建图像。
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公开(公告)号：US20080169808A1
公开(公告)日：2008-07-17
申请号：US11721707
申请日：2005-12-22
IPC分类号： G01R33/565 , G01R33/48
CPC分类号： G01R33/56509 , G01R33/4824 , G01R33/561 , G01R33/5614 , G01R33/5616
摘要： Provided is a magnetic resonance imaging apparatus capable of highly precisely detecting and compensating body motions within a short processing time during radial scanning. The magnetic resonance imaging apparatus includes a control unit that applies radiofrequency magnetic fields and magnetic field gradients to a subject lying down in a static magnetic field and that detects magnetic resonance signals generated from the subject, and an arithmetic unit that handles the signals. The arithmetic unit performs subject's body motion detection in an image space, uses an image, which is reconstructed using the low-frequency portion of the k-space data of the image, as criterial data, produces templates by moving the criterial data in advance by predetermined magnitudes of rotations and predetermined magnitudes of translations, and uses the produced templates to perform the body motion detection.
摘要翻译： 提供一种磁共振成像装置，其能够在径向扫描期间在短的处理时间内高精度地检测和补偿身体运动。 磁共振成像装置包括：控制单元，其对位于静态磁场中的被摄体进行射频磁场和磁场梯度，并且检测从被检体产生的磁共振信号;以及运算单元，其处理该信号。 算术单元在图像空间中进行被摄体的身体运动检测，使用利用图像的k空间数据的低频部分重构的图像作为标准数据，通过预先移动标准数据来生成模板 预定的旋转角度和预定的平移量，并且使用所产生的模板来执行身体运动检测。
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公开(公告)号：US07372269B2
公开(公告)日：2008-05-13
申请号：US10553900
申请日：2004-04-23
IPC分类号： G01V3/00
CPC分类号： G01R33/4824 , G01R33/5611
摘要： In a magnetic resonance imaging apparatus, an RF pulse is applied to a subject placed in a static magnetic field, a plurality of gradient magnetic fields are applied, and induced nuclear magnetic resonance signal (echo signal) is received by means of a RF receiving coil unit composed of two or more RF receiving coils. A parallel MRI method is applied to echo signals acquired by reducing the echoes per blade of a propeller MRI method so as to remove the artifact to produce a reconstructed image. The reconstructed image is subjected to inverse Fourier transform to return it to the echo signals in a measurement space corresponding to the blade. The echo signals are girded in an arbitrarily predetermined coordinate system for image and combined. Such a processing is conducted for the echo signals of all the blades. A final image is reconstructed using the echo signals after the image creation in the coordinate system for image.
摘要翻译： 在磁共振成像装置中，将RF脉冲施加到放置在静态磁场中的被摄体，施加多个梯度磁场，并且通过RF接收线圈接收感应的核磁共振信号（回波信号） 单元由两个或更多个RF接收线圈组成。 将并行MRI方法应用于通过减小螺旋桨MRI方法的每个叶片的回波而获得的回波信号，以便去除伪影以产生重建图像。 对重构图像进行傅立叶逆变换，将其返回到与叶片对应的测量空间中的回波信号。 回波信号被束缚在用于图像并组合的任意预定的坐标系中。 对所有叶片的回波信号进行这样的处理。 在用于图像的坐标系中的图像创建之后，使用回波信号重建最终图像。
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