公开(公告)号：US07071689B2

公开(公告)日：2006-07-04

申请号：US10729360

申请日：2003-12-04

申请人： Xavier Golay ,  Hanzhang Lu ,  Peter C. M. van Zijl

发明人： Xavier Golay ,  Hanzhang Lu ,  Peter C. M. van Zijl

IPC分类号： G01V3/00

CPC分类号： G01R33/4828 ,  G01R33/4806 ,  G01R33/561

摘要： Featured are methods for magnetic resonance imaging in which MR signals of selected tissues, fluid or body components in a target area are desired to be essentially eliminated, which method includes applying an initial RF inversion pulse to invert the magnetization of the selected tissues or to apply any other T1 preparation aimed at nulling one or more tissue species and successively applying one or more RF inversions pulses thereafter. More particularly, the successively applied RF inversion pulses are applied so as to essentially maintain the magnetization of the selected tissues at or about the zero-crossing point of the longitudinal magnetization. Such methods further include interleaving a plurality of excitation pulses for acquiring image data and the RF inversion pulses so that at least one of the plurality of excitation pulses follows in a time sequence the application of one of the applied RF inversion pulses such that the image data is acquired following an inversion pulse.

摘要翻译： 特征是用于磁共振成像的方法，其中期望目标区域中所选择的组织，流体或身体成分的MR信号基本上被消除，该方法包括施加初始RF反转脉冲以反转所选组织的磁化或应用 任何其他T 1制剂旨在使一个或多个组织物质归零并且此后连续施加一个或多个RF反转脉冲。 更具体地，施加连续施加的RF反转脉冲，以便在纵向磁化的过零点处或其周围基本保持所选组织的磁化。 这样的方法还包括交织用于获取图像数据和RF反相脉冲的多个激励脉冲，使得多个激励脉冲中的至少一个激励脉冲以时间顺序跟随施加的RF反转脉冲之一的应用，使得图像数据 在反转脉冲之后被采集。

公开(公告)号：US07053618B2

公开(公告)日：2006-05-30

申请号：US10723312

申请日：2003-11-26

申请人： Yudong Zhu

发明人： Yudong Zhu

IPC分类号： G01V3/00

CPC分类号： G01R33/561 ,  G01R33/288 ,  G01R33/5612

摘要： A system composed of multiple transmit coils with corresponding RF pulse synthesizers and amplifiers is disclosed. A method of designing RF pulses specific to each transmit coil to induce spatiotemporal variations in a composite B1 field is also disclosed. The present invention supports faithful production of desired excitation profiles and accommodates the use of any coil array geometry. The present invention also supports reduction in excitation pulse length. Through effective B1 field maps for each transmit coil, mutual coupling and other inter-coil correlations are accounted for in the RF pulse design.

公开(公告)号：US07047062B2

公开(公告)日：2006-05-16

申请号：US10063826

申请日：2002-05-16

申请人： Paul E. Licato ,  Steven Wolff

发明人： Paul E. Licato ,  Steven Wolff

IPC分类号： A61B5/05

CPC分类号： G01R33/561

摘要： Disclosed herein is a system and method for decreasing gradient field pulse sequence duration and reducing peripheral nerve stimulation with known gradient pulse areas for a magnetic resonance imaging system. The method comprising: receiving a first desired area corresponding to a first pulse; obtaining a second desired area corresponding to a second pulse; selecting the first pulse as a nested pulse if the first desired area is smaller than the second desired area, and establishing the second pulse as a nesting pulse, otherwise selecting the second pulse as the nested pulse and establishing the first pulse as the nesting pulse. The method also includes: determining an amplitude and pulse duration for the nested pulse and ascertaining an amplitude and pulse duration for the nesting pulse. Finally, the method includes arranging a plurality of gradient field pulse sequences to include the nested pulse and the nesting pulse.

公开(公告)号：US07046006B2

公开(公告)日：2006-05-16

申请号：US10223995

申请日：2002-08-20

申请人： Henricus Mathijs Maria Creemers

发明人： Henricus Mathijs Maria Creemers

IPC分类号： G01V3/00

CPC分类号： G01R33/3415 ,  G01R33/3678 ,  G01R33/561 ,  G01R33/5611

摘要： The acquisition of MR images while utilizing sub-sampling of the RF signals generated in the patient 21 to be examined is known. Such sub-sampling methods require at least two RF receiving coils which should not have a substantial component of their sensitivity vectors in common. According to the invention at least two coils 22a, 22b are used, a first one (22a) having its sensitivity vector extending substantially transversely of its physical coil plane whereas a second one (22b) has its sensitivity vector extending substantially parallel to its physical coil plane. The coils can thus be placed close to the surface of the patient without interfering with each other. They can be arranged in such a manner that their planes are oriented parallel to the main magnetic field Bo. Moreover, the coils can be arranged so as to overlap substantially, so that they provide the same field of view.

摘要翻译： 利用在待检查的患者21中产生的RF信号的子采样来获取MR图像是已知的。 这种子采样方法需要至少两个RF接收线圈，其不应该具有共同的敏感矢量的实质分量。 根据本发明，使用至少两个线圈22a，22b，第一个（22a）的灵敏度矢量基本上横向于其物理线圈平面延伸，而第二个（22b）的灵敏度矢量基本上平行延伸 到其物理线圈平面。 因此，线圈可以靠近患者的表面放置，而不会彼此干扰。 它们可以以它们的平面平行于主磁场Bo的方式布置。 此外，线圈可以被布置成基本上重叠，使得它们提供相同的视场。

公开(公告)号：US07030609B2

公开(公告)日：2006-04-18

申请号：US11052716

申请日：2005-01-26

申请人： James G. Pipe

发明人： James G. Pipe

IPC分类号： G01V3/00

CPC分类号： G01R33/56341 ,  G01R33/561

摘要： The present invention provides a system and method of MR imaging particularly applicable with fast spin echo protocols. Odd and even echoes are used to create separate blades or strips in k-space. Preferably, each blade extends through the center of k-space. The blades are incrementally rotated about the center of k-space with each echo train until a full set of k-space data is acquired. After a phase correction, each odd and even blade is combined into a single k-space data set that is used for image reconstruction.

摘要翻译： 本发明提供了一种特别适用于快速自旋回波协议的MR成像系统和方法。 奇数和偶数回波用于在k空间中创建单独的刀片或条带。 优选地，每个叶片延伸穿过k空间的中心。 使用每个回波列，刀片以k空间的中心逐渐地旋转，直到获取完整的k空间数据集。 在相位校正之后，将每个奇数和偶数叶片组合成用于图像重构的单个k空间数据集。

公开(公告)号：US20060028206A1

公开(公告)日：2006-02-09

申请号：US10911795

申请日：2004-08-05

申请人： Qiang Zhang ,  Orlando Simonetti

发明人： Qiang Zhang ,  Orlando Simonetti

IPC分类号： G01V3/00

CPC分类号： G01R33/561 ,  G01R33/4824

摘要： In a method and apparatus for generating a magnetic resonance image, raw magnetic resonance data are acquired from a subject for each of a number of PROPELLER strips using, for each strip, multiple magnetic resonance reception coils in a partial acquisition technique (PAT), and the raw data in said PROPELLER strips are entered into k-space according to the PROPELLER scan. A PAT reconstruction of the data in k-space is conducted dependent on the respective sensitivities of the reception coils, and a PROPELLER reconstruction of the data in k-space is conducted after the PAT reconstruction for generating a magnetic resonance image of the subject.

摘要翻译： 在用于产生磁共振图像的方法和装置中，对于每个带有多个磁共振接收线圈的部分采集技术（PAT），对于多个PROPELLER条带中的每一个，从对象获取原始磁共振数据，以及 所述PROPELLER条带中的原始数据根据PROPELLER扫描进入k空间。 根据接收线圈的相应灵敏度进行k空间中的数据的PAT重建，并且在用于产生对象的磁共振图像的PAT重建之后进行在k空间中的数据的PROPELLER重建。

公开(公告)号：US20050245809A1

公开(公告)日：2005-11-03

申请号：US10709365

申请日：2004-04-29

申请人： Steven Wolff ,  Thomas Foo

发明人： Steven Wolff ,  Thomas Foo

IPC分类号： A61B5/05 ,  G01R33/28 ,  G01R33/561

CPC分类号： G01R33/561 ,  G01R33/281

摘要： A method of generating a magnetic resonance image is provided, comprising subjecting a subject to a magnetic field. The subject comprised of a first tissue a second tissue and a third tissue. The method generates a first pulse sequence at a first TI time and generates a first image after the first pulse sequence. The first image has a first image first tissue magnitude, a first image second tissue magnitude, and a first image third tissue magnitude. The method then generates a second pulse sequence at a second TI time and generates a second image after the second pulse sequence. The second image has a second image first tissue magnitude, a second image second tissue magnitude, and a second image third tissue magnitude. Finally, the method generates a resultant image by combining the first image and the second image. The first image first tissue magnitude and the second image first tissue magnitude combine to form a positive resultant first tissue magnitude. The first image third tissue magnitude and the second image third tissue magnitude combine to form a negative resultant image third tissue magnitude.

摘要翻译： 提供了一种产生磁共振图像的方法，包括使受试者受到磁场的影响。 受试者由第一组织组成，第二组织和第三组织组成。 该方法在第一TI时间产生第一脉冲序列，并在第一脉冲序列之后产生第一图像。 第一图像具有第一图像第一组织幅度，第一图像第二组织幅度和第一图像第三组织幅度。 然后，该方法在第二TI时间产生第二脉冲序列，并在第二脉冲序列之后产生第二图像。 第二图像具有第二图像第一组织量值，第二图像第二组织量值和第二图像第三组织量值。 最后，该方法通过组合第一图像和第二图像来生成合成图像。 第一图像第一组织幅度和第二图像第一组织幅度组合形成正的合成第一组织幅度。 第一图像第三组织幅度和第二图像第三组织幅度组合形成负的合成图像第三组织幅度。

公开(公告)号：US20050007114A1

公开(公告)日：2005-01-13

申请号：US10604597

申请日：2003-08-01

申请人： James Pipe

发明人： James Pipe

IPC分类号： G01R33/561 ,  G01R33/563 ,  G01V3/00

CPC分类号： G01R33/56341 ,  G01R33/561

摘要： The present invention provides a system and method of MR imaging particularly applicable with fast spin echo protocols. Odd and even echoes are used to create separate blades or strips in k-space. Preferably, each blade extends through the center of k-space. The blades are incrementally rotated about the center of k-space with each echo train until a full set of k-space data is acquired. After a phase correction, each odd and even blade is combined into a single k-space data set that is used for image reconstruction.

摘要翻译： 本发明提供了一种特别适用于快速自旋回波协议的MR成像系统和方法。 奇数和偶数回波用于在k空间中创建单独的刀片或条带。 优选地，每个叶片延伸穿过k空间的中心。 使用每个回波列，刀片以k空间的中心逐渐地旋转，直到获取完整的k空间数据集。 在相位校正之后，将每个奇数和偶数叶片组合成用于图像重构的单个k空间数据集。

公开(公告)号：US06791321B2

公开(公告)日：2004-09-14

申请号：US10173933

申请日：2002-06-18

申请人： Jacob D. Willig-Onwuachi ,  Robert W. Brown ,  Shmaryu M. Shvartsman

发明人： Jacob D. Willig-Onwuachi ,  Robert W. Brown ,  Shmaryu M. Shvartsman

IPC分类号： G01V300

CPC分类号： G01R33/561 ,  G01R33/34046 ,  G01R33/5611

摘要： In a magnetic resonance imaging apparatus, a main magnet assembly (12) produces a uniform magnetic field through an imaging region (14). An imaging region is defined within a subject by selecting gradient magnetic fields spatially encode the main magnetic field. A whole body birdcage radio frequency coil (26) excites magnetic resonance in dipoles of the subject. The resonance signals are received by the whole body coil (26) and by a second, local birdcage radio frequency coil (16). The first radio frequency coil (26) produces and is sensitive to a uniform radio frequency field in the imaging region (14) while the second radio frequency coil (28) is sensitive to a field that varies sinusoidally in space. From one radio frequency excitation, the two birdcage coils (26, 16) receive different sets of data with which to fill k-space, accelerating data collection.

摘要翻译： 在磁共振成像装置中，主磁体组件（12）通过成像区域（14）产生均匀的磁场。 通过选择对主磁场进行空间编码的梯度磁场，在对象内定义成像区域。 全身鸟笼射频线圈（26）激发受试者的偶极子中的磁共振。 谐振信号由全体线圈（26）和第二局部鸟笼射频线圈（16）接收。 第一射频线圈（26）对成像区域（14）中的均匀射频场产生并且敏感，而第二射频线圈（28）对于空间正弦变化的场敏感。 从一个射频激励，两个鸟笼线圈（26,16）接收不同的数据集合，以填充k空间，加速数据收集。

公开(公告)号：US06731969B2

公开(公告)日：2004-05-04

申请号：US09966402

申请日：2001-09-28

申请人： Johannes Jacobus Van Vaals ,  Frederik Visser

发明人： Johannes Jacobus Van Vaals ,  Frederik Visser

IPC分类号： A61B5055

CPC分类号： G01R33/561 ,  G01R33/28 ,  G01R33/56308

摘要： A magnetic resonance method for forming a fast dynamic image from a plurality of signals of an RF probe is described. The RF probe is moved relative to an object to be imaged so as to acquire at least two adjacent Fields-of-View (FOV) which are reconstructed so as to form an image of a region of interest which includes both FOVs. The object to be imaged is scanned by a moving RF antenna. Furthermore, the first FOV is centered at the initial probe position and after each subsequent scan the position of the imaging field within the actual FOV is determined. From that data the next position of the RF probe relative to the object is computed and, if the imaging field runs out of the actual FOV, the RF antenna is moved to the estimated next position of the RF probe so that the subsequent FOV is centered again at the RF probe position. A composite image is then generated from the successive images of the various adjacent FOVs.

摘要翻译： 描述了用于从RF探针的多个信号形成快速动态图像的磁共振方法。 RF探针相对于要被成像的物体移动，以获得至少两个相邻的视场（FOV），其被重构以形成包括两个FOV的感兴趣区域的图像。 要被成像的物体被移动的RF天线扫描。 此外，第一FOV以初始探针位置为中心，并且在每次后续扫描之后，确定在实际FOV内的成像场的位置。 根据该数据计算RF探针相对于物体的下一个位置，并且如果成像场用完实际FOV，则将RF天线移动到RF探测器的估计的下一个位置，以便随后的FOV居中 再次在RF探针位置。 然后从各种相邻FOV的连续图像生成合成图像。