公开(公告)号：US07868618B2

公开(公告)日：2011-01-11

申请号：US12308186

申请日：2007-06-12

申请人： Yo Taniguchi ,  Hisaaki Ochi

发明人： Yo Taniguchi ,  Hisaaki Ochi

IPC分类号： G01V3/00

CPC分类号： G01R33/5613 ,  A61B5/055 ,  G01R33/543 ,  G01R33/586

摘要： The MRI apparatus of the present invention executes a non-imaging mode 501 for obtaining a steady state of magnetization and an imaging mode 502 for measuring echoes for images. In the non-imaging mode 501 and the imaging mode 502, imaging is performed by using a GrE type pulse sequence. In the imaging, RF pulses are irradiated while flip angle of nuclear magnetization in the imaging mode 502 is changed in a range of values not larger than a certain value determined by flip angle of nuclear magnetization used in the non-imaging mode 502 is irradiated. This certain value is, for example, the maximum value of flip angle of nuclear magnetization used in the non-imaging mode, or flip angle provided by an RF pulse used at the end of the non-imaging mode. SAR observed with use of a GrE type pulse sequence can be thereby reduced without degrading image contrast, and thus influence on human bodies can be reduced.

摘要翻译： 本发明的MRI装置执行用于获得稳定的磁化状态的非成像模式501和用于测量图像的回波的成像模式502。 在非成像模式501和成像模式502中，通过使用GrE型脉冲序列进行成像。 在成像中，照射成像模式502中的核磁化的翻转角的RF脉冲在不大于由非成像模式502中使用的核磁化的翻转角确定的某个值的范围内变化的范围内。 该特定值例如是在非成像模式中使用的核磁化的翻转角的最大值或由在非成像模式结束时使用的RF脉冲提供的翻转角。 可以通过使用GrE型脉冲序列观察到的SAR，而不会降低图像对比度，从而可以降低对人体的影响。

公开(公告)号：US07701214B2

公开(公告)日：2010-04-20

申请号：US11912763

申请日：2006-02-23

申请人： Shinji Kurokawa ,  Yo Taniguchi ,  Hisaaki Ochi ,  Shin-ichiro Umemura

发明人： Shinji Kurokawa ,  Yo Taniguchi ,  Hisaaki Ochi ,  Shin-ichiro Umemura

IPC分类号： G01V3/00

CPC分类号： G01R33/56375 ,  G01R33/56383

摘要： When a magnetic resonance signal is received more than once, while a table (transfer unit) is moved, a gradient magnetic field is applied in the table moving direction, and an application amount (intensity and application time) of the gradient magnetic field in the table moving direction is changed every acquisition of data. As for the encoding by the gradient magnetic field in the table moving direction, a series of phase encode is performed at different positions of an examination target, unlike a conventional phase encode. Therefore, the Fourier transform cannot be applied to the image reconstruction. Given this situation, a magnetization map of total FOV of the examination target is determined in such a manner that a sum of the square of an absolute value of a difference is minimized, the difference between a received signal and a signal calculated from the magnetization map set as a variable, and then, the reconstruction is performed. Even when a size of signal acquisition area in the table moving direction is narrow, the magnetic resonance imaging apparatus of the present invention is capable of taking an image of a wide field of view at high speed, by performing the imaging while the table is moved continuously.

摘要翻译： 当多次接收到磁共振信号时，在移动台（传送单元）的同时，在台移动方向上施加梯度磁场，并且在梯形磁场的施加量（强度和施加时间） 每次采集数据时，表移动方向都会发生变化。 对于表移动方向的梯度磁场的编码，与现有的相位编码不同，在检查对象的不同位置进行一系列的相位编码。 因此，傅里叶变换不能应用于图像重构。 考虑到这种情况，检测对象的总FOV的磁化映射以如下方式来确定，使得差的绝对值的平方和之和最小化，接收信号与从磁化映射计算的信号之间的差 设置为变量，然后进行重建。 即使当表移动方向上的信号获取区域的尺寸窄时，本发明的磁共振成像装置也能够通过在桌子移动时进行成像而以高速拍摄宽视野的图像 不断地

公开(公告)号：US20100033183A1

公开(公告)日：2010-02-11

申请号：US12064514

申请日：2006-12-21

申请人： Hisaaki Ochi ,  Masayoshi Dohata ,  Atsushi Ninomiya ,  Yoshiyuki Miyamoto

发明人： Hisaaki Ochi ,  Masayoshi Dohata ,  Atsushi Ninomiya ,  Yoshiyuki Miyamoto

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/34069 ,  G01R33/3415 ,  G01R33/3806 ,  G01R33/5611

摘要： This invention provides a receiving coil that allows a high-quality image of high depth sensitivity to be obtained during vertical magnetic field MRI without limiting selection of a cross section to be imaged and of a phase-encoding axis. A subject's field of view is broadened without deterioration of the coil characteristics. Two orthogonal solenoid coils (3-1 and 4-1) and sub-coils (5-1, 6-1, and 7-1) whose sensitivity distributions each become an odd function in an x-direction, a y-direction, and a z-direction, respectively, with respect to the origin of the sensitivity distribution of each of the solenoid coils are used as multiple sub-coils to construct the receiving coil. This receiving coil is suitable for a high-speed imaging method in which an image is acquired using reduced phase encoding and the image is reconstructed using image folding. In addition, the subject's field of view can be broadened by arranging conductors of the coil appropriately.

摘要翻译： 本发明提供了一种接收线圈，其允许在垂直磁场MRI期间获得高深度灵敏度的高质量图像，而不限制要成像的横截面和相位编码轴的选择。 受试者的视野扩大而不会降低线圈特性。 两个正交电磁线圈（3-1和4-1）和子线圈（5-1,6-1和7-1）的灵敏度分布在x方向，y方向， 和相对于每个螺线管线圈的灵敏度分布的原点的z方向被用作构成接收线圈的多个子线圈。 该接收线圈适用于使用减少的相位编码获取图像并且使用图像折叠重建图像的高速成像方法。 此外，可以通过适当地布置线圈的导体来扩大被摄体的视野。

公开(公告)号：US20090251142A1

公开(公告)日：2009-10-08

申请号：US12308186

申请日：2007-06-12

申请人： Yo Taniguchi ,  Hisaaki Ochi

发明人： Yo Taniguchi ,  Hisaaki Ochi

IPC分类号： G01R33/54 ,  G01R33/28

CPC分类号： G01R33/5613 ,  A61B5/055 ,  G01R33/543 ,  G01R33/586

摘要： The MRI apparatus of the present invention executes a non-imaging mode 501 for obtaining a steady state of magnetization and an imaging mode 502 for measuring echoes for images. In the non-imaging mode 501 and the imaging mode 502, imaging is performed by using a GrE type pulse sequence. In the imaging, RF pulses are irradiated while flip angle of nuclear magnetization in the imaging mode 502 is changed in a range of values not larger than a certain value determined by flip angle of nuclear magnetization used in the non-imaging mode 502 is irradiated. This certain value is, for example, the maximum value of flip angle of nuclear magnetization used in the non-imaging mode, or flip angle provided by an RF pulse used at the end of the non-imaging mode. SAR observed with use of a GrE type pulse sequence can be thereby reduced without degrading image contrast, and thus influence on human bodies can be reduced.

摘要翻译： 本发明的MRI装置执行用于获得稳定的磁化状态的非成像模式501和用于测量图像的回波的成像模式502。 在非成像模式501和成像模式502中，通过使用GrE型脉冲序列进行成像。 在成像中，照射成像模式502中的核磁化的翻转角的RF脉冲在不大于由非成像模式502中使用的核磁化的翻转角确定的某个值的范围内变化的范围内。 该特定值例如是在非成像模式中使用的核磁化的翻转角的最大值或由在非成像模式结束时使用的RF脉冲提供的翻转角。 可以通过使用GrE型脉冲序列观察到的SAR，而不会降低图像对比度，从而可以降低对人体的影响。

公开(公告)号：US07141975B2

公开(公告)日：2006-11-28

申请号：US11032010

申请日：2005-01-11

申请人： Hisaaki Ochi ,  Kazuo Saitoh ,  Michiya Okada

发明人： Hisaaki Ochi ,  Kazuo Saitoh ,  Michiya Okada

IPC分类号： G01V3/00

CPC分类号： G01R33/34069 ,  G01R33/34023 ,  G01R33/34053 ,  G01R33/3635

摘要： An NMR system that enables multiplex resonance measurement includes a superconductivity reception coil, a transmission coil, and four electric current loops. The NMR system also includes an additional coil in which directions of currents that flow in an inner loop and an outer loop are opposite to each other. The additional coil and the transmission coil are arranged such that a direction of a high frequency magnetic field that is developed in the center of the additional coil when electricity is fed to the additional coil is substantially identical with a direction of a high frequency magnetic field that is developed in the center of the transmission coil when electricity is fed to the transmission coil. The electric current loop of the transmission coil is arranged substantially in the middle of the inner loop and the outer loop of the additional coil in which directions of electric currents that flow in the inner loop and the outer loop are opposite to each other.

摘要翻译： 能够实现多重谐振测量的NMR系统包括超导接收线圈，传输线圈和四个电流回路。 NMR系统还包括附加线圈，其中在内环和外环中流动的电流的方向彼此相反。 附加线圈和传输线圈布置成使得当电被馈送到附加线圈时在附加线圈的中心产生的高频磁场的方向与高频磁场的方向基本相同， 当电力被馈送到传输线圈时，在传输线圈的中心形成。 传输线圈的电流回路基本上布置在内环的中间和附加线圈的外环中，其中在内环和外环中流动的电流的方向彼此相反。

公开(公告)号：US07138801B2

公开(公告)日：2006-11-21

申请号：US11192081

申请日：2005-07-29

申请人： Hiroyuki Yamamoto ,  Kazuo Saitoh ,  Haruhiro Hasegawa ,  Hisaaki Ochi

发明人： Hiroyuki Yamamoto ,  Kazuo Saitoh ,  Haruhiro Hasegawa ,  Hisaaki Ochi

IPC分类号： G01V3/00

CPC分类号： G01R33/34053 ,  G01R33/34007 ,  G01R33/34023 ,  G01R33/34069 ,  G01R33/34092 ,  H01F5/003 ,  H01F6/00 ,  H01F6/06 ,  H01F17/0013

摘要： An NMR probe having a high-sensitivity solenoid probe coil for receiving free induction decay (FID) signals in nuclear magnetic resonance (NMR) spectroscopy, and an NMR spectrometer which incorporates this probe. The solenoid probe coil is fabricated by a building block approach where it mainly consists of coil substrates having superconducting thin film coils made from superconducting thin film thereon, and side holding plates and a wiring substrate with line pattern of superconducting thin films which are both perpendicular to the coil substrates. The superconducting thin film coils are connected with the line patterns of superconducting thin films by capacitive coupling to make the solenoid coil configuration and solenoid probe coil of superconducting material.

摘要翻译： 具有用于在核磁共振（NMR）光谱中接受自由感应衰减（FID）信号的高灵敏度电磁探针线圈的NMR探针和包含该探针的NMR光谱仪。 螺线管探针线圈由构建块方法制造，其主要由其上由超导薄膜制成的超导薄膜线圈的线圈基板和具有垂直于超导薄膜的线路图案的侧保持板和布线基板组成 线圈基板。 超导薄膜线圈通过电容耦合与超导薄膜的线路图案连接，以形成电磁线圈配置和超导材料的螺线管探针线圈。

公开(公告)号：US20060033498A1

公开(公告)日：2006-02-16

申请号：US11196279

申请日：2005-08-04

申请人： Kazuo Saitoh ,  Haruhiro Hasegawa ,  Hiroyuki Yamamoto ,  Hisaaki Ochi ,  Tsuyoshi Wakuda ,  Michiya Okada

发明人： Kazuo Saitoh ,  Haruhiro Hasegawa ,  Hiroyuki Yamamoto ,  Hisaaki Ochi ,  Tsuyoshi Wakuda ,  Michiya Okada

IPC分类号： G01V3/00

CPC分类号： G01R33/34053 ,  G01R33/34007 ,  G01R33/34023 ,  G01R33/34069 ,  G01R33/34092

摘要： A configuration of an NMR apparatus is provided. In the NMR apparatus, a magnetic field space of higher uniformity is generated by split superconducting magnets. At the same time, it is provided with a cryo probe excellent in cooling capability and sensitivity between two superconducting solenoid coils constructed in very close proximity to each other. For this purpose, a probe coil provided between the two superconducting solenoid coils is so constructed that the following is implemented: a certain distance is ensured between a substrate with a coil formed thereon and another, and the substrates and spacer substrates for cooling are alternately laminated. The spacer substrates are cooled by a cold head of sapphire. When the probe coil is inserted in the same direction as a sample tube (direction perpendicular to the static magnetic field), the spacer substrates cannot be coupled directly by the cold head of sapphire. Therefore, they are cooled through a fixed substrate for thermal conduction of sapphire coupled with the cold head.

摘要翻译： 提供了NMR装置的结构。 在NMR装置中，通过分体超导磁体产生更高均匀性的磁场空间。 同时，它提供了一种低温探针，该低温探针具有非常接近的两个超导螺线管线圈之间的冷却能力和灵敏度。 为此，设置在两个超导螺线管线圈之间的探针线圈被构造成使得实现以下功能：在其上形成有线圈的基板和另一个之间确保一定距离，并且用于冷却的基板和间隔基板交替层压 。 间隔基板被蓝宝石的冷头冷却。 当探针线圈沿着与样品管相同的方向（垂直于静磁场的方向）插入时，间隔基板不能由蓝宝石的冷头直接耦合。 因此，它们通过固定的基板进行冷却，用于与冷头连接的蓝宝石的热传导。

公开(公告)号：US06876201B2

公开(公告)日：2005-04-05

申请号：US10468963

申请日：2002-02-25

申请人： Masahiro Takizawa ,  Tetsuhiko Takahashi ,  Hisaaki Ochi ,  Yo Taniguchi

发明人： Masahiro Takizawa ,  Tetsuhiko Takahashi ,  Hisaaki Ochi ,  Yo Taniguchi

IPC分类号： G01R33/3415 ,  G01R33/561 ,  G01V3/00

CPC分类号： G01R33/5611 ,  G01R33/3415

摘要： A magnetic resonance imaging apparatus includes a magnetic field generation means for applying gradient magnetic fields and a radio-frequency magnetic field to a patient placed in a static magnetic field in a predetermined pulse sequence; a multiple RF receiving coil comprising at least three RF receiving coils for receiving the nuclear magnetic resonance signals generated from the patient; and an image reconstruction means for reconstructing an image by processing the received nuclear magnetic resonance signals, wherein the image reconstruction means includes a coil selection means for selecting a plurality of RF receiving coil groups that are preset by combining the plurality of RF receiving coils according to imaging conditions, a synthesization means for synthesizing the measured data received by the respective RF receiving coils of each of the plurality of selected RF receiving coil groups, and a calculation means for eliminating aliasing artifacts by executing a matrix calculation as to the synthesized data.

摘要翻译： 磁共振成像装置包括磁场产生装置，用于以预定的脉冲序列向放置在静态磁场中的患者施加梯度磁场和射频磁场; 多个RF接收线圈，其包括用于接收从患者产生的核磁共振信号的至少三个RF接收线圈; 以及图像重建装置，用于通过处理所接收的核磁共振信号来重建图像，其中图像重建装置包括线圈选择装置，用于选择通过组合多个RF接收线圈来预设的多个RF接收线圈组，根据 成像条件，用于合成由多个选择的RF接收线圈组中的每一个的相应RF接收线圈接收的测量数据的合成装置，以及用于通过执行关于合成数据的矩阵计算来消除混叠伪像的计算装置。

公开(公告)号：US06546274B2

公开(公告)日：2003-04-08

申请号：US09788512

申请日：2001-02-21

申请人： Hiroyuki Itagaki ,  Hisaaki Ochi

发明人： Hiroyuki Itagaki ,  Hisaaki Ochi

IPC分类号： A61B505

CPC分类号： G01R33/56333 ,  A61B5/055 ,  G01R33/5673

摘要： A nuclear magnetic resonance imaging apparatus in which a synchronizing signal is generated from a periodic physiological signal generated by a subject to be inspected, and a radiofrequency burst pulse is applied to the subject to be inspected in synchronism with the synchronizing signal while a gradient magnetic field in one direction is being applied to the subject to be inspected to modulate nuclear magnetizations of the subject to be inspected in the one direction. The radiofrequency burst pulse includes plural sub-pulses which are formed at equidistant intervals on a time axis and which have amplitudes modulated by a sinc function.

摘要翻译： 一种核磁共振成像装置，其中从由待检查对象产生的周期性生理信号产生同步信号，并且将射频突发脉冲与同步信号同步地施加到待检查的对象，同时梯度磁场 在一个方向上被施加到被检查对象以调制要在一个方向上被检查的对象的核磁化。 射频脉冲串脉冲包括在时间轴上以等间隔形成且具有由sinc功能调制的振幅的多个子脉冲。

公开(公告)号：US5789922A

公开(公告)日：1998-08-04

申请号：US645478

申请日：1996-05-13

申请人： Hisaaki Ochi ,  Etsuji Yamamoto ,  Yo Taniguchi

发明人： Hisaaki Ochi ,  Etsuji Yamamoto ,  Yo Taniguchi

IPC分类号： G01R33/46 ,  A61B5/055 ,  G01R33/48 ,  G01R33/561

CPC分类号： G01R33/446 ,  G01R33/5615

摘要： In an inspecting method based on nuclear magnetic resonance, a burst wave having a plurality of sub-pulses frequency-modulated with a high frequency is generated, the burst wave is amplitude-modulated with at least a function which repeats polarity inversion, the amplitude-modulated burst wave is irradiated, as an exciting high frequency pulse, to an object to be inspected, and gradient magnetic fields are generated in predetermined pulse sequence to measure a nuclear magnetic resonance signal.

摘要翻译： 在基于核磁共振的检查方法中，产生具有高频率频率调制的多个子脉冲的脉冲波，突发波被至少以重复极性反转的功能进行幅度调制， 作为激励高频脉冲将调制脉冲波照射到要检查的物体，并且以预定脉冲序列产生梯度磁场以测量核磁共振信号。