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1. 发明申请

US20110245655A1 MAGNETIC RESONANCE IMAGING APPARATUS AND PULSE SEQUENCE ADJUSTING METHOD 审中-公开
标题翻译：磁共振成像装置和脉冲序列调整方法
公开(公告)号：US20110245655A1
公开(公告)日：2011-10-06
申请号：US13139041
申请日：2009-12-22
申请人： Takayuki Abe , Masahiro Takizawa , Tetsuhiko Takahashi
发明人： Takayuki Abe , Masahiro Takizawa , Tetsuhiko Takahashi
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。

2. 发明授权

US08032201B2 Magnetic resonance imaging device 失效
标题翻译：磁共振成像装置
公开(公告)号：US08032201B2
公开(公告)日：2011-10-04
申请号：US11917689
申请日：2006-06-15
申请人： Yo Taniguchi , Hisaaki Ochi , Tetsuhiko Takahashi , Masahiro Takizawa
发明人： Yo Taniguchi , Hisaaki Ochi , Tetsuhiko Takahashi , Masahiro Takizawa
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。

3. 发明申请

US20110089948A1 MAGNETIC RESONANCE IMAGING APPARATUS 有权
标题翻译：磁共振成像装置
公开(公告)号：US20110089948A1
公开(公告)日：2011-04-21
申请号：US12912385
申请日：2010-10-26
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。

4. 发明申请

US20100087729A1 MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD 有权
标题翻译：磁共振成像装置和磁共振成像方法
公开(公告)号：US20100087729A1
公开(公告)日：2010-04-08
申请号：US12523343
申请日：2008-02-01
申请人： Masahiro Takizawa , Tetsuhiko Takahashi
发明人： Masahiro Takizawa , Tetsuhiko Takahashi
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。

5. 发明申请

US20080169808A1 Magnetic Resonance Imaging Apparatus 有权
标题翻译：磁共振成像仪
公开(公告)号：US20080169808A1
公开(公告)日：2008-07-17
申请号：US11721707
申请日：2005-12-22
申请人： Yo Taniguchi , Hisaaki Ochi , Masahiro Takizawa , Tetsuhiko Takahashi
发明人： Yo Taniguchi , Hisaaki Ochi , Masahiro Takizawa , Tetsuhiko Takahashi
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。

6. 发明授权

US07372269B2 Magnetic resonance imaging method and apparatus 有权
标题翻译：磁共振成像方法和装置
公开(公告)号：US07372269B2
公开(公告)日：2008-05-13
申请号：US10553900
申请日：2004-04-23
申请人： Masahiro Takizawa , Tetsuhiko Takahashi , Yo Taniguchi
发明人： Masahiro Takizawa , Tetsuhiko Takahashi , Yo Taniguchi
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。

7. 发明申请

US20060232273A1 Magnetic resonance imaging method and apparatus 有权
标题翻译：磁共振成像方法和装置
公开(公告)号：US20060232273A1
公开(公告)日：2006-10-19
申请号：US10553900
申请日：2004-04-23
申请人： Masahiro Takizawa , Tetsuhiko Takahashi , Yo Taniguchi
发明人： Masahiro Takizawa , Tetsuhiko Takahashi , Yo Taniguchi
IPC分类号： G01V3/00 , A61B5/05
CPC分类号： G01R33/4824 , G01R33/5611
摘要： High-speed imaging by a propeller MRI method is enabled as a whole thanks to high-speed computation by preventing an aliasing artifact even if the echoes acquired by one blade are decreased and by reducing the imaging time and the computational complexity. 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 multiple 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：通过螺旋桨MRI方法的高速成像由于高速计算，即使通过防止由一个叶片获得的回波减少并且通过减少成像时间和计算复杂度来防止混叠伪影，也能够实现。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，并且通过多个RF接收来接收诱导的核磁共振信号（回波信号）线圈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。

8. 发明授权

US06541970B1 Nuclear magnetic resonance imaging method and device 失效
标题翻译：核磁共振成像方法及装置
公开(公告)号：US06541970B1
公开(公告)日：2003-04-01
申请号：US09529352
申请日：2000-06-13
申请人： Masahiro Takizawa , Tetsuhiko Takahashi
发明人： Masahiro Takizawa , Tetsuhiko Takahashi
IPC分类号： G01V300
CPC分类号： G01R33/56554
摘要： In a multi-shot MR imaging method, a navigator echo V(kx, n) of which phase-encoding amount is 0 is generated by applying a gradient magnetic field pulse in a readout direction (x-direction) and collected at each segment. A phase shift map C(kx, n) of V(kx, n) collected in the n-th segment is produced in k-space as a function in kx-direction with V(kx, 1) collected in the first segment being the reference. Next, noises are removed from C(kx, n), and C(kx, n) is smoothed. Then, an image echo signal S(kx, n, m) collected in the n-th segment is corrected in k-space according to a smoothed phase shift map C′(kx, n) of V(kx, n) collected in the same segment, and an image echo signal S′(kx, n, m) of which phase shifts are corrected is thereby acquired. Thus, the phase shifts of the image echo signals caused by a motion in the x-direction of a patient can be precisely corrected at a high speed. By reconstructing an image with the corrected image echo signal S′(kx, n, m), the image without motion artifacts can be acquired in realtime.
摘要翻译：在多重MR成像方法中，相位编码量为0的导航回波V（kx，n）通过在读出方向（x方向）施加梯度磁场脉冲而产生，并在每个段收集。在k空间中，在第k个方向上产生V（kx，n）中的V（kx，n）的相移图C（kx，n）作为kx方向的函数，在第一段中收集的V（kx，1）为参考。接下来，从C（kx，n）去除噪声，并且平滑C（kx，n）。然后，根据所收集的V（kx，n）的平滑相移映射C'（kx，n），在k空间中将在第n段中采集的图像回波信号S（kx，n，m）相同的段和校正了相移的图像回波信号S'（kx，n，m）。因此，可以高速地精确地校正由患者的x方向上的运动引起的图像回波信号的相移。通过用校正图像回波信号S'（kx，n，m）重构图像，可以实时获取没有运动伪影的图像。

9. 发明授权

US6118273A Magnetic resonance imaging method and device therefor 有权
标题翻译：磁共振成像方法及其装置
公开(公告)号：US6118273A
公开(公告)日：2000-09-12
申请号：US149121
申请日：1998-09-09
申请人： Masahiro Takizawa , Tetsuhiko Takahashi
发明人： Masahiro Takizawa , Tetsuhiko Takahashi
IPC分类号： G01R33/54 , A61B5/055 , G01R33/561 , G01R33/567 , G01V3/00
CPC分类号： G01R33/56554 , G01R33/56509
摘要： In a magnetic resonance imaging method in which after irradiating RF pulses of magnetic resonance frequencies into an object to be inspected, a sequence of detecting echo signals sequentially and a step of reconstructing an image by making use of the obtained echo signals are repeated in parallel, and an animating image is obtained by successively renewing a part of the echo signals used for reconstructing the previous image, a navigator echo is generated for every irradiation of the RF pulses and is detected, a navigator echo which serves as a reference for correcting phases of the echo signals used for the image reconstruction is successively renewed for every image, and the phases of the echo signals are corrected based on the renewed navigator echo for every image obtain the same. Thereby, a reference time for correcting object motion by making use of navigator echoes (3021, 3022) is set short and artifacts due to an object motion is reduced with an accuracy corresponding to a high temporal resolution. Thus, an MRI method which permits reduction of artifacts due to object motions while keeping a high temporal resolution for an MRI of animating images is provided.
摘要翻译：在磁共振成像方法中，在将磁共振频率的RF脉冲照射到待检查对象之后，顺序地检测回波信号的序列，并且并行地重复利用获得的回波信号重建图像的步骤，并且通过连续地更新用于重构先前图像的回波信号的一部分来获得动画图像，产生针对RF脉冲的每次照射的导航回波，并且检测导航回波，该导航回波用作校正相位用于图像重构的回波信号对于每个图像被连续地更新，并且基于对于获得相同的每个图像的更新的导航回波校正回波信号的相位。因此，通过利用导航回波（3021,3022）来校正物体运动的参考时间被设置得很短，并且由于对象运动引起的伪像以对应于高时间分辨率的精度降低。因此，提供了一种MRI方法，其允许由于对象运动而减少伪像，同时保持用于动画图像的MRI的高时间分辨率。

10. 发明授权

US08154294B2 Magnetic resonance imaging apparatus and method for correcting error due to gradient magnetic field 有权
标题翻译：用于校正梯度磁场引起的误差的磁共振成像装置和方法
公开(公告)号：US08154294B2
公开(公告)日：2012-04-10
申请号：US12601378
申请日：2008-06-03
申请人： Masahiro Takizawa , Tetsuhiko Takahashi
发明人： Masahiro Takizawa , Tetsuhiko Takahashi
IPC分类号： G01V3/00
CPC分类号： G01R33/56518 , G01R33/482 , G01R33/4824 , G01R33/561
摘要： In a non-cartesian sampling method, in order to reduce an artifact on an image caused by an error of a gradient magnetic field, data for correcting the error caused by the gradient magnetic field are obtained when data used for image reconstruction are obtained, and the data used for the image reconstruction are corrected by using the obtained data for the correction. In order to obtain the data for correcting the error, a block having plural parallel echo signals is measured.
摘要翻译：在非笛卡尔采样方法中，为了减少由梯度磁场的误差引起的图像上的伪像，获得用于图像重建的数据获得用于校正由梯度磁场引起的误差的数据，以及通过使用获得的校正数据来校正用于图像重建的数据。为了获得用于校正误差的数据，测量具有多个并行回波信号的块。

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