公开(公告)号：US20080112603A1

公开(公告)日：2008-05-15

申请号：US11598214

申请日：2006-11-09

申请人： Edward S. Boyden ,  Roderick A. Hyde ,  Muriel Y. Ishikawa ,  Edward K.Y. Jung ,  Eric C. Leuthardt ,  Nathan P. Myhrvold ,  Dennis J. Rivet ,  Michael A. Smith ,  Clarence T. Tegreene ,  Thomas A. Weaver ,  Charles Whitmer ,  Lowell L. Wood ,  Victoria Y.H. Wood

发明人： Edward S. Boyden ,  Roderick A. Hyde ,  Muriel Y. Ishikawa ,  Edward K.Y. Jung ,  Eric C. Leuthardt ,  Nathan P. Myhrvold ,  Dennis J. Rivet ,  Michael A. Smith ,  Clarence T. Tegreene ,  Thomas A. Weaver ,  Charles Whitmer ,  Lowell L. Wood ,  Victoria Y.H. Wood

IPC分类号： G06K9/00

CPC分类号： G01R33/565

摘要： Certain aspects can relate to obtaining at least some input compensating information at least partially based on the distortion characterizing imaging information that when applied to an imaging modality used to obtain the at least one image information can limit distortions to the at least the portion of the at least one image information resulting from at least a portion of at least one distorting feature, wherein the at least some input compensating information is characterized based at least in part on the at least one relative orientation of the at least the portion of the at least one distorting feature relative to the at least one image information.

摘要翻译： 至少部分地基于失真表征成像信息来获得至少一些输入补偿信息的某些方面可以涉及当应用于用于获得所述至少一个图像信息的成像模态时可以限制到at的至少一部分的失真 至少一个图像信息由至少一个失真特征的至少一部分产生，其中所述至少一些输入补偿信息至少部分地基于至少一个至少一个失真特征的至少一个部分的至少一个相对取向来表征 相对于至少一个图像信息的扭曲特征。

公开(公告)号：US20070145976A1

公开(公告)日：2007-06-28

申请号：US11613583

申请日：2006-12-20

申请人： Kenji Asano

发明人： Kenji Asano

IPC分类号： G01V3/00

CPC分类号： G01R33/5613 ,  G01R33/54 ,  G01R33/5614 ,  G01R33/565 ,  G01R33/56563

摘要： The present invention aims to receive a signal of tissue long in T2 at a relatively high level and suppress artifacts. When a magnetic resonance frequency of a component intended for measurement is assumed to be Ω and the frequency corresponding to a repetition time TR is assumed to be ωo, an RF pulse obtained by modulating a chemical shift SAT pulse for reducing a signal of a frequency Ω with cos (ωo·t) is applied as a leading pulse Po and thereafter a pulse sequence of Balanced SSFP is applied. Since a signal leading to the occurrence of artifacts is reduced owing to the effect of the leading pulse, the artifacts can be suppressed. Since a transient state is long in the same manner as conventional, such a signal of tissue long in T2 can be received at the relatively high level and contrast can be kept high by executing data acquisition in the transient state.

摘要翻译： 本发明旨在以较高的水平在T2中长时间接收组织的信号，并且抑制伪影。 当假想测量的部件的磁共振频率被认为是Omega，并且将与重复时间TR相对应的频率假定为omega，则通过调制化学位移SAT脉冲获得的RF脉冲，用于减小频率ωi的信号 其中cos（ωgao.t）作为前导脉冲Po施加，然后施加平衡SSFP的脉冲序列。 由于导致伪影的发生的信号由于引导脉冲的影响而减小，所以可以抑制伪影。 由于瞬时状态与传统方式相同，因此可以在相对较高的水平接收T2中长的组织信号，并且可以通过在瞬态执行数据采集来保持对比度。

公开(公告)号：US20070038069A1

公开(公告)日：2007-02-15

申请号：US10570397

申请日：2004-09-03

申请人： Hiroyuki Itagaki ,  Tomohiro Goto ,  Yumiko Yatsui ,  Tetsuhiko Takahshi

发明人： Hiroyuki Itagaki ,  Tomohiro Goto ,  Yumiko Yatsui ,  Tetsuhiko Takahshi

IPC分类号： A61B5/05

CPC分类号： G01R33/563 ,  G01R33/5601 ,  G01R33/5602 ,  G01R33/5614 ,  G01R33/5635 ,  G01R33/565 ,  G01R33/56509 ,  G01R33/5673 ,  G01R33/5676

摘要： When performing imaging in synchronization with a biological movement of an examinee by using a pulse sequence applying a pre-saturation pulse, it is possible to reduce irregularities of echo signal intensity and artifact on the image generated by the irregularities. Especially, it is possible to prevent artifact attributed to blood in the ventricle when performing delay contrast imaging. For this, before measuring the echo signal, an IR pulse or the like for adjusting magnetization to a desired state is applied so as to suppress irregularities of the echo signal intensity and prevent artifact.

摘要翻译： 当通过使用施加预饱和脉冲的脉冲序列与被检体的生物运动同步地进行成像时，可以减少由不规则性产生的图像上的回波信号强度和伪影的不规则性。 特别地，当进行延迟对比度成像时，可以防止归因于心室中的血液的伪像。 为此，在测量回波信号之前，施加用于将磁化调整到期望状态的IR脉冲等，以便抑制回波信号强度的不规则并防止伪影。

公开(公告)号：US20060273790A1

公开(公告)日：2006-12-07

申请号：US10554120

申请日：2004-04-13

申请人： Holgers Eggers ,  Tobias Schaffter ,  Peter Bornert

发明人： Holgers Eggers ,  Tobias Schaffter ,  Peter Bornert

IPC分类号： G01V3/00

CPC分类号： G01R33/56554 ,  G01R33/565 ,  G01R33/56536

摘要： The invention relates to a method for generating an MR image of an object situated in an examination volume of an MR apparatus. The method begins with the acquisition of a plurality of echo signals having at least two different echo-time values (ti, t2, t3), the echo signals being generated from high-frequency pulses and magnetic-field gradient pulses by means of an imaging sequence. An intermediate MR image (5, 6, 7) is then reconstructed for each echo-time value (ti, t2, t3). By analyzing these intermediate MR images (5, 6, 7), local relaxation times (T2*(x)) and/or local frequency shifts (Aw(x)) are determined by taking account of the respective echo-time values (t1, t2, t3). Finally, a definitive MR image (11) is reconstructed from the echo signals (1) in their entirety.

摘要翻译： 本发明涉及一种用于产生位于MR装置的检查体积中的物体的MR图像的方法。 该方法开始于获取具有至少两个不同回波时间值（ti，t 2，t 3）的多个回波信号，回波信号由高频脉冲和磁场梯度脉冲通过 成像序列。 然后针对每个回波时间值（ti，t 2，t 3）重建中间MR图像（5,6,7）。 通过分析这些中间MR图像（5,6,7），通过考虑相应的回波时间值来确定局部弛豫时间（T 2 *（x））和/或局部频移（Aw（x）） t 1，t 2，t 3）。 最后，从回波信号（1）整体重建确定的MR图像（11）。

公开(公告)号：US20060116569A1

公开(公告)日：2006-06-01

申请号：US11290750

申请日：2005-11-30

申请人： Aki Yamazaki

发明人： Aki Yamazaki

IPC分类号： A61B5/05

CPC分类号： G01R33/565 ,  G01R33/4824 ,  G01R33/561

摘要： The present invention is intended to provide a phase error measuring method capable of measuring a phase error occurring in each phase encoding direction that corresponds to the direction of a readout magnetic field gradient which is turned in units of a radian. The phase error measuring method in accordance with the present invention is implemented in a magnetic resonance imaging (MRI) apparatus that performs a K-space filling scan to define data in a K-space having readout lines formed along a Kx axis, a Ky axis, and a mixed axis of them. The phase error measuring method includes a plurality of phase error measurement steps of measuring a phase error that occurs in each phase encoding direction corresponding to the direction of a readout magnetic field gradient which is turned in units of a radian.

摘要翻译： 本发明旨在提供一种相位误差测量方法，该方法能够测量与以弧度为单位转换的读出磁场梯度的方向相对应的每个相位编码方向上产生的相位误差。 根据本发明的相位误差测量方法在磁共振成像（MRI）装置中实现，所述磁共振成像（MRI）装置执行K空间填充扫描以在K空间中定义具有沿Kx轴，Ky轴 ，和它们的混合轴。 相位误差测量方法包括多个相位误差测量步骤，用于测量与以弧度为单位转换的读出磁场梯度的方向相对应的每个相位编码方向上发生的相位误差。

公开(公告)号：US07034533B2

公开(公告)日：2006-04-25

申请号：US10514272

申请日：2003-05-14

申请人： John P. Mugler, III ,  James R. Brookeman

发明人： John P. Mugler, III ,  James R. Brookeman

IPC分类号： G01V3/00

CPC分类号： G01R33/5615 ,  G01R33/281 ,  G01R33/5613 ,  G01R33/565 ,  G01R33/56509

摘要： A methodology, system and computer program product for designing and optimizing a rapid magnetic resonance imaging pulse sequence for creating images of a gas or gas-filled structure with substantially reduced diffusion-induced signal attenuation during the course of data acquisition compared to that for currently available magnetic resonance imaging techniques is disclosed. The methodology and system allows desirable combinations of image signal-to-noise ration, spatial resolution and temporal resolution to be achieved that were heretofore not possible. For example, magnetic resonance imaging of hyperpolarized noble gases, which recently has shown significant promise for several medical imaging applications, particularly imaging of the human lung, can be improved. Pulse sequences designed according to the subject methods permit signal levels to be achieved that are up to ten times higher than those possible with the gradient-echo methods now commonly used for hyperpolarized-gas imaging. This signal increase can be traded for substantially lower does, and hence much lower cost, of the hyperpolarized-gas agent. The methodology and system will also be useful for non-biological applications of hyperpolarized gases for example material science studies, as well as for magnetic resonance imaging of any other gas for biological or non-biological applications. Pulse sequences designed according to the subject methods can also serve as the foundation for a variety of specialized gas-imaging pulse sequences, such as those for apparent-diffusion-coefficient, dynamic or oxygen-concentration imaging.

摘要翻译： 一种用于设计和优化快速磁共振成像脉冲序列的方法学，系统和计算机程序产品，用于在数据采集过程中与当前可用的数据采集相比，在气体或气体填充结构中形成显着降低的扩散诱发信号衰减的图像 公开了磁共振成像技术。 该方法和系统允许实现迄今为止不可能实现的图像信噪比，空间分辨率和时间分辨率的期望组合。 例如，最近已经显示出许多医学成像应用，特别是人肺成像的超极化惰性气体的磁共振成像可以得到改善。 根据本方法设计的脉冲序列允许实现比现在通常用于超极化气体成像的梯度回波方法可能达到的高达十倍的信号水平。 这种信号增加可以以极低的价格进行交易，因此成本更低，这是超极化气体的。 该方法和系统也可用于超极化气体的非生物应用，例如材料科学研究，以及任何其他气体用于生物或非生物应用的磁共振成像。 根据本方法设计的脉冲序列还可以作为各种特定气体成像脉冲序列的基础，例如用于表观扩散系数，动态或氧浓度成像的脉冲序列。

公开(公告)号：US20030114746A1

公开(公告)日：2003-06-19

申请号：US10318937

申请日：2002-12-13

申请人： Siemens Aktiengesellschaft

发明人： Heiko Meyer

IPC分类号： A61B005/055

CPC分类号： G01R33/565 ,  G01R33/56545

摘要： In a method and magnetic resonance system for registering magnetic resonance signals of a subject and reconstructing an image on the basis of the registered magnetic resonance signals, an operator provides a control device of the magnetic resonance system with a reconstruction region in a phase-coding direction within which the image should be reconstructed on the basis of the magnetic resonance signals to be registered. The control device effects the registration of the magnetic resonance signals in the phase-coding direction beyond the reconstruction region as well in two independently selectable supplemental regions that are disposed at both sides of the reconstruction region in the phase-coding direction and which immediately adjoin said reconstruction region.

摘要翻译： 在用于记录对象的磁共振信号和基于登记的磁共振信号重构图像的方法和磁共振系统中，操作者向磁共振系统的控制装置提供相位编码方向上的重建区域 其中根据要登记的磁共振信号来重建图像。 控制装置在相位编码方向超过重建区域的磁共振信号的配准以及在相位编码方向上配置在重建区域两侧的两个可独立选择的补充区域中，并且紧邻所述 重建区。

公开(公告)号：US06424152B1

公开(公告)日：2002-07-23

申请号：US09486993

申请日：2000-03-01

申请人： Willem M. Prins ,  Gerardus N. Peeren

发明人： Willem M. Prins ,  Gerardus N. Peeren

IPC分类号： G01V300

CPC分类号： G01R33/565 ,  G01R33/56509

摘要： A magnetic resonance imaging facilitates a pre-compensating phase encoding of spuriously generated magnetizations. The method includes generating a preparatory excitation of spins represented upon an RF-excitation line, applying subsequently a temporary magnetic compensation gradient as represented along a phase-encoding axis, generating subsequently an RF excitation pulse as represented upon the RF-excitation line, applying subsequent to the RF excitation pulse, and before an acquisition interval for receiving magnetic resonance signals, a phase-encoding gradient as represented along the phase-encoding axis. The phase-encoding gradient is substantially the same magnitude as, and opposite in direction relative to, the direction of the temporary magnetic compensation gradient. The last step includes receiving magnetic resonance signals during the acquisition interval as represented along the RF-excitation line.

摘要翻译： 磁共振成像有利于对伪产生的磁化进行预补偿相位编码。 该方法包括产生在RF激励线上表示的自旋的准备激励，随后施加沿着相位编码轴表示的临时磁补偿梯度，随后产生如RF激励线上表示的RF激励脉冲，随后应用 到RF激励脉冲之前和在用于接收磁共振信号的获取间隔之前，沿相位编码轴表示的相位编码梯度。 相位编码梯度与临时磁补偿梯度的方向基本相同，并且相对于临时磁补偿梯度的方向相反。 最后一步包括在沿RF激励线表示的采集间隔期间接收磁共振信号。

公开(公告)号：US6037771A

公开(公告)日：2000-03-14

申请号：US938715

申请日：1997-09-26

申请人： Kecheng Liu ,  Brian K. Rutt

发明人： Kecheng Liu ,  Brian K. Rutt

IPC分类号： A61B5/055 ,  G01R33/483 ,  G01V3/00

CPC分类号： G01R33/0041 ,  A61B5/055 ,  G01R33/4822 ,  G01R33/5635 ,  G01R33/565

摘要： A 3DFT gradient-recalled echo pulse sequence is employed to acquire NMR data from which an MR angiogram is produced. A thin slab excitation is employed and this thin slab is incremented in slice-thickness steps through the volume of interest as the NMR data is acquired. Navigator echoes are acquired at each thin slab location to correct the NMR data for phase errors produced by the sliding slab technique.

摘要翻译： 采用3DFT梯度回波脉冲序列获取产生MR血管造影图的NMR数据。 采用薄板激励，并且随着NMR数据的获取，该薄板坯以切片厚度步长递增通过感兴趣的体积。 在每个薄板位置获取导航回波，以校正由滑动板技术产生的相位误差的NMR数据。

公开(公告)号：US5502384A

公开(公告)日：1996-03-26

申请号：US243907

申请日：1994-05-17

申请人： Chitose Nakaya ,  Yoshitaka Bito ,  Etsuji Yamamoto ,  Hiroshi Nishimura ,  Hiroyuki Takeuchi ,  Shigeru Watanabe ,  Akihiro Miyajima ,  Hitoshi Arai

发明人： Chitose Nakaya ,  Yoshitaka Bito ,  Etsuji Yamamoto ,  Hiroshi Nishimura ,  Hiroyuki Takeuchi ,  Shigeru Watanabe ,  Akihiro Miyajima ,  Hitoshi Arai

IPC分类号： A61B5/055 ,  G01R33/28 ,  G01R33/561 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/565 ,  G01R33/561

摘要： In an image reconstruction method in a nuclear magnetic resonance imaging apparatus, the method comprises first and second steps to get detected data S.sub.I for at least about half of region inclusive of an origin and data S.sub.IV in a region symmetric with respect to a line passing through an origin on one of axes from the detected region in the acquired data space and parallel to the other axis, respectively, third and fourth steps to perform inverse Fourier transform on the data S.sub.I and S.sub.IV, respectively, a fifth step to get a complex conjugate value of the result obtained from Step 3, a sixth step to get a complex conjugate value of the result obtained from Step 4, a seventh step to calculate a phase map from the results obtained from the second, third, fourth, fifth and sixth steps, an eighth step to multiply the result obtained from step 6 by the phase map obtained from step 7 and to obtain a phase corrected data, and a ninth step to sum the result obtained from the third step and the result obtained from the eighth step. The method can thus obtain the whole reconstructed image.

摘要翻译： 在核磁共振成像装置中的图像重建方法中，该方法包括第一和第二步骤，用于在相对于通过的线对称的区域中获得包含原点和数据SIV的区域的至少约一半的检测数据SI 在获取的数据空间中的检测区域中的一个轴上的原点，并且平行于另一个轴的原点;第三和第四步骤，分别对数据SI和SIV执行逆傅里叶变换，第五步骤以获得复共轭 从步骤3获得的结果的值，第六步骤，获得从步骤4获得的结果的复共轭值，第七步骤，从根据从第二，第三，第四，第五和第六步骤获得的结果计算相位图 第八步，将从步骤6获得的结果乘以从步骤7获得的相位图，并获得相位校正数据;第九步骤，将从第三步骤获得的结果与res 从第八步获得。 因此，该方法可以获得整个重建图像。