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公开(公告)号：US5792054A
公开(公告)日：1998-08-11
申请号：US712953
申请日：1996-09-12
IPC分类号： A61B5/055 , G01R33/48 , G01R33/563
CPC分类号： G01R33/5635 , G01R33/5605
摘要： An off-resonance magnetization transfer contrast (MTC) RF-pulse (54, 64) is used in magnetic resonance angiography (MRA) to suppress the signal of various stationary tissues, such as brain tissue while avoiding significant suppression of signal from blood flowing in a general direction of blood flow into a slice being imaged. Application of a magnetic gradient (55, 65, 85) during the MTC RF-pulse (54, 64) directed in the general direction of blood flow increases the magnetization frequency offset (86) relative to the center frequency of the MTC RF-pulse for points within and feeding blood to the slice. The MTC RF-pulse thus causes only a small signal reduction of the blood flowing into the slice in the general direction of blood flow while producing a saturation of any blood flowing into the slice in the opposite direction. Consequently, both time and RF-power needed for a separate presaturation pulse can now be used for the MTC RF-pulse.
摘要翻译： 在磁共振血管造影术（MRA）中使用非共振磁化转移对比（MTC）RF脉冲（54,64）来抑制诸如脑组织的各种静止组织的信号，同时避免对来自血液流动的信号的显着抑制 血液流入被成像的切片的大致方向。 在针对大体血流方向的MTC RF脉冲（54,64）期间施加磁梯度（55,65,85）相对于MTC RF脉冲的中心频率增加磁化频率偏移（86） 对于切片内的血液和血液进行供血。 因此，MTC RF脉冲仅导致在血流的大致方向上流入切片的血液的小信号减少，同时产生沿相反方向流入切片的任何血液的饱和度。 因此，现在可以将MTC RF脉冲用于单独的预饱和脉冲所需的时间和RF功率。
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公开(公告)号：US5938600A
公开(公告)日：1999-08-17
申请号：US767596
申请日：1996-12-09
CPC分类号： A61N7/02 , G01R33/4804 , A61B2090/374 , G01R33/563
摘要： A method of heating a target region by ultrasound radiation includes determination of a position of the target region by a magnetic resonance method. The device for carrying out this method includes an ultrasound device and an MR device. By determining movement of the target region utilizing the MR device (100) and an appropriate magnetic resonance method, and by coupling the movement information to the ultrasound device (118) by an electric signal (122, 124), it is achieved that the ultrasound device can be controlled by the movement information. Various possibilities exist for controlling the ultrasound device. According to a first possibility, the focal region is adjusted to be situated within the target region in order to generate ultrasound. Another possibility is to determine from the movement information the instant at which the target region is situated within the focal region of the ultrasound and to generate ultrasound exclusively for a brief subsequent period during which the focal region is still within the target region. Another possibility is to refrain from generating ultrasound when the movement speed is too high. Finally, the movement information can also be used for making the focal region follow the target region during the generation of ultrasound.
摘要翻译： 通过超声波辐射加热目标区域的方法包括通过磁共振法确定目标区域的位置。 用于执行该方法的装置包括超声装置和MR装置。 通过使用MR装置（100）和适当的磁共振方法来确定目标区域的移动，并且通过用电信号（122,124）将移动信息耦合到超声装置（118），实现超声波 设备可以由运动信息控制。 存在用于控制超声装置的各种可能性。 根据第一可能性，将焦点区域调整为位于目标区域内以便产生超声波。 另一种可能性是从移动信息中确定目标区域位于超声波聚焦区域内的时刻，并且专门针对焦点区域仍在目标区域内的短暂的后续周期产生超声波。 另一种可能是当移动速度太高时避免产生超声波。 最后，运动信息也可以用于在超声波产生期间使焦点区域跟随目标区域。
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公开(公告)号：US06430429B1
公开(公告)日：2002-08-06
申请号：US09453421
申请日：1999-12-02
IPC分类号： A61B505
CPC分类号： G01R33/285 , G01R33/281
摘要： A magnetic resonance imaging (MRI) system is provided with an interventional instrument with an indicator element which influences, for example locally disturbs, the magnetic resonance image. The position of the interventional instrument within the patient to be examined is derived from the local disturbances in the image as caused by the interventional instrument. The degree of influencing of the magnetic resonance image is adjustable notably by rotation of the interventional instrument with the indicator element relative to the direction of the steady magnetic field of the magnetic resonance imaging system. For example, the indicator element is a paramagnetic strip which may include several segments of different magnetic susceptibility.
摘要翻译： 磁共振成像（MRI）系统提供有介导仪器，其具有影响例如局部扰动磁共振图像的指示元件。 介入仪器在待检查患者中的位置来源于介入仪器引起的图像局部紊乱。 磁共振图像的影响程度可以通过介导仪器与指示元件相对于磁共振成像系统的稳定磁场的方向的旋转来进行调节。 例如，指示元件是顺磁条，其可以包括不同磁化率的几个段。
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公开(公告)号：US5951472A
公开(公告)日：1999-09-14
申请号：US960249
申请日：1997-10-29
IPC分类号： G01R33/28 , G01R33/561 , G01R33/567 , A61B5/055
CPC分类号： G01R33/285 , G01R33/56308
摘要： An MR system for interventional procedures, includes an MR device and an invasive device. The MR device is arranged to acquire images of a part of an object. A part of the invasive device can be imaged in an MR image by providing a coil or a conductor loop which has two non-magnetic conductors which are situated at some distance from one another underneath the surface of the invasive device. A reduction of artefacts due to the movement of a patient or the invasive device can be obtained by sampling an MR signal, whereby an auxiliary magnetic field is periodically applied during the time in which the plurality of lines in k-space are scanned.
摘要翻译： 用于介入程序的MR系统包括MR装置和侵入性装置。 MR装置被布置成获取对象的一部分的图像。 侵入性装置的一部分可以通过提供线圈或导体环来成像在MR图像中，所述线圈或导体环具有两个非侵入性导体，该非磁性导体位于与入侵装置的表面下方相距一定距离处。 可以通过对MR信号进行采样来获得由于患者或侵入性装置的移动引起的人为因素的减少，从而在扫描k空间中的多个行的时间期间周期性地施加辅助磁场。
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公开(公告)号：US5713357A
公开(公告)日：1998-02-03
申请号：US498288
申请日：1995-06-30
CPC分类号： G01R33/4812
摘要： An imaging system includes to a magnetic resonance device (1) for imaging inter alia human organs by way of magnetic resonance and an X-ray device for imaging by way of X-ray. When interventional techniques are applied in combination with a magnetic resonance device (1), the organs are suitably visualized, but the instruments guided to an organ via an opening in the body are not visible or only hardly so. These instruments must be imaged by means of an X-ray device (20); the patient must then be transported some distance, for example a few meters, in order to obtain distortion-free images of the instruments. Transporting the patient has some drawbacks. There is a risk of motion of the instruments within the patient and, moreover, the coordinate systems of the MR device (1) and the X-ray device (20) might deviate from one another. A solution consists in arranging the X-ray device (20) immediately adjacent to or in the MR device (1), so that the patient need not be transported at all or only over a small distance. The undesired mutual influencing of the MR device (1) and the X-ray device (20) is counteracted, for example by using a solid-state X-ray detector (22) which includes a solid-state image pick-up device and, for example by making the position of the X-ray tube (40) dependent on the static magnetic field of the magnetic resonance device.
摘要翻译： 成像系统包括用于通过磁共振成像尤其是人体器官的磁共振装置（1）和用于通过X射线成像的X射线装置。 当介入技术与磁共振装置（1）组合使用时，器官被适当地可视化，但是通过身体中的开口引导到器官的器械是不可见的或仅仅是不可见的。 这些仪器必须通过X射线装置（20）成像; 然后必须将患者运送一些距离，例如几米，以获得乐器的无变形图像。 运送病人有一些缺点。 存在患者内的仪器运动的风险，此外，MR装置（1）和X射线装置（20）的坐标系可能彼此偏离。 解决方案在于将X射线装置（20）直接布置在MR装置（1）附近或其中，使得患者不需要全部输送或仅在较小的距离上运输。 MR装置（1）和X射线装置（20）的不期望的相互影响被抵消，例如通过使用包括固态摄像装置的固态X射线检测器（22）和 ，例如通过使X射线管（40）的位置取决于磁共振装置的静磁场。
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公开(公告)号：US06426994B1
公开(公告)日：2002-07-30
申请号：US09551005
申请日：2000-04-18
IPC分类号： G01R33563
CPC分类号： G01R33/56 , G01R33/5608 , G01R33/563 , G01R33/5635 , G06T7/11 , G06T7/174 , G06T2207/10088 , G06T2207/10116 , G06T2207/20016 , G06T2207/20224 , G06T2207/30104
摘要： An image processing method includes the acquisition of a succession of low-resolution images. A succession of mask images is derived from the low-resolution images. Furthermore, a high-resolution image is acquired. The mask images are applied to the high-resolution image as bandpass filters in order to form a filtered high-resolution image. The filtered high-resolution image represents image information relating to a particular phase of a dynamic process, such as the passage of blood through the vascular system of a patient. The image processing method is used, for example in MR angiography or in X-ray angiography. An MRI system or an X-ray examination apparatus is provided with an image processor for carrying out the image processing method according to the invention.
摘要翻译： 图像处理方法包括获取一系列低分辨率图像。 从低分辨率图像导出一系列掩模图像。 此外，获取高分辨率图像。 将掩模图像作为带通滤波器应用于高分辨率图像，以便形成滤波的高分辨率图像。 经滤波的高分辨率图像表示与动态过程的特定阶段相关的图像信息，例如血液通过患者的血管系统。 使用图像处理方法，例如在MR血管造影术或X射线血管造影术中。 MRI系统或X射线检查装置设置有用于执行根据本发明的图像处理方法的图像处理器。
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公开(公告)号：US5810726A
公开(公告)日：1998-09-22
申请号：US632235
申请日：1996-04-15
IPC分类号： G01R33/48 , A61B5/055 , G01R33/561 , G01R33/565
CPC分类号： G01R33/561 , G01R33/4824 , G01R33/5619 , G01R33/56308
摘要： A method of magnetic resonance imaging of a part of the body (106) arranged in a substantially uniform, static magnetic field where, in order to follow a dynamic process in the body, the temporal resolution is enhanced by successively generating MR signals which are associated with only a part of a reference set of lines in the k-space. After the generating and sampling of a series of MR signals associated with the lines of the part of the reference set, a reconstruction set is renewed and an image of the part of the body is reconstructed from the reconstruction set by a processing unit (110) executing a 2D Fourier transformation, said image subsequently being displayed on a monitor (111). In order to counteract motion artefacts, for example echo images of contours of objects in the image, the associated lines of the part of the reference set are uniformly distributed in the k-space during the generating of MR signals.
摘要翻译： 布置在基本上均匀的静态磁场中的身体（106）的一部分的磁共振成像的方法，其中为了跟随身体中的动态过程，时间分辨率通过连续产生相关联的MR信号来增强 在k空间中只有一部分参考线。 在与参考集合的一部分的行相关联的一系列MR信号的生成和采样之后，重建集合被更新，并且由处理单元（110）从重建集合重建身体的部分的图像， 执行2D傅立叶变换，所述图像随后显示在监视器（111）上。 为了抵消运动伪像，例如图像中对象轮廓的回波图像，参考组的部分的相关行在MR信号的产生期间均匀分布在k空间中。
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8.发明授权Method of and device for determining a temperature distribution in an object by means of magnetic resonance 失效用于通过磁共振确定物体中的温度分布的方法和装置
公开(公告)号：US6064206A
公开(公告)日：2000-05-16
申请号：US173215
申请日：1998-10-15
申请人： Johannes J. Van Vaals , Jouke Smink
发明人： Johannes J. Van Vaals , Jouke Smink
IPC分类号： A61B5/055 , G01R33/48 , G01R33/567 , G01V3/00
CPC分类号： G01R33/4804
摘要： The invention relates to a method of determining, utilizing magnetic resonance, a temperature distribution of a part of an object which is arranged in a substantially uniform steady magnetic field, the determination of the temperature distribution involving the determination of a reference image of the object, for example a part of the human body, and a phase image of the human body. Subsequently, the temperature distribution is determined from phase differences between the values of pixels of the phase image and the values of corresponding pixels of a predetermined reference phase image. In order to counteract errors in the temperature distribution which are caused by motion of the object, navigator pulse sequences are generated so as to measure navigator signals prior to the measurement of MR signals wherefrom the reference image and the phase image are reconstructed. Subsequently, a correction for correction of the temperature distribution is derived from the navigator signals.
摘要翻译： 本发明涉及一种利用磁共振来确定被布置在基本上均匀的稳定磁场中的物体的一部分的温度分布的方法，包括确定对象的参考图像的温度分布的确定， 例如人体的一部分，以及人体的相位图像。 随后，根据相位图像的像素值与预定的基准相位图像的相应像素的值之间的相位差来确定温度分布。 为了抵消由物体的运动导致的温度分布误差，产生导航脉冲序列，以测量MR信号之前的导航信号，从而重建参考图像和相位图像。 随后，从导航信号导出校正温度分布的校正。
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公开(公告)号：US5969525A
公开(公告)日：1999-10-19
申请号：US878363
申请日：1997-06-18
IPC分类号： G01R33/385 , A61B5/055 , G01R33/34 , G01R33/3415 , G01R33/38 , G01R33/3875 , G01V3/00
CPC分类号： G01R33/3806
摘要： MR imaging apparatus includes a magnet (1) for generating in an examination zone (3) a uniform, steady magnetic field having substantially parallel lines of force extending in a first direction (Z), a gradient coil system (5) for generating a magnetic gradient field, and an RF coil system for generating RF pulses and for receiving MR signals. The apparatus also includes devices (25,27,31) for generating data from the MR signals, and a reconstruction unit (39) for reconstructing an MR image of the examination zone (3) from a set of the data. A patient support system includes a table top (7) drive means (11) configured for displacement of the table top in the first direction (Z), and a connection (43) for coupling the drive means and the control unit (29). The magnet (1) has a generally toroidal-shaped housing (15) surrounding a bore (17) and has a longitudinal axis (19) extending substantially parallel to the first direction (Z). The housing (15) has a radial thickness (r) in a direction transverse to said axis (19) and a longitudinal thickness (1) in a direction substantially parallel to said axis, the radial thickness being greater than the longitudinal thickness.
摘要翻译： MR成像装置包括：磁体（1），用于在检查区（3）中产生具有在第一方向（Z）上延伸的基本上平行的力线的均匀的稳定磁场;梯度线圈系统（5），用于产生磁 梯度场和用于产生RF脉冲并用于接收MR信号的RF线圈系统。 该装置还包括用于从MR信号产生数据的装置（25,27,31）和用于从一组数据重建检查区（3）的MR图像的重建单元（39）。 患者支撑系统包括被配置为在第一方向（Z）上移动台面的台面（7）驱动装置（11）和用于联接驱动装置和控制单元（29）的连接件（43）。 磁体（1）具有围绕孔（17）的大致环形的壳体（15），并且具有基本上平行于第一方向（Z）延伸的纵向轴线（19）。 壳体（15）在垂直于所述轴线（19）的方向上具有径向厚度（r）和在基本上平行于所述轴线的方向上的纵向厚度（1），径向厚度大于纵向厚度。
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公开(公告)号：US5807254A
公开(公告)日：1998-09-15
申请号：US558063
申请日：1995-11-13
CPC分类号： A61B6/4417 , A61B5/0035 , A61B5/0046 , A61B5/055 , A61B6/107 , G01R33/4812
摘要： A magnetic resonance device (1) for imaging inter alia human organs by way of magnetic resonance is provided in close proximity with an x-ray imaging device (20). When, for example, in neurosurgery interventional techniques are executed in combination with a magnetic resonance device (1), the organs are suitably visualized but the instruments guided to an organ via an opening in the body are not visible or only hardly so. Prior to the present invention, in order to carry out interventional procedures, the patient would be transported between a room housing magnetic resonance device and a room housing on x-ray device. Transporting the patient over a long distance between two rooms is objectional because of the risk of motion of the instruments lodged within the body of the patient; as such motion could be fatal to the patient. A solution consists in arranging an X-ray device (20) adjacent the MR device (1), so that the patient need be transported a short distance only. Undesirable mutual influencing of the MR device (1) and the X-ray device (20) is counteracted by shielding the static magnetic field of the MR device and the electromagnetic fields generated by the X-ray device.
摘要翻译： 提供用于通过磁共振成像尤其是人体器官的磁共振装置（1），其紧邻x射线成像装置（20）。 例如，当与磁共振装置（1）结合执行神经外科手术介入技术时，器官被适当地可视化，但是通过身体中的开口引导到器官的器械是不可见的或仅仅是不可见的。 在本发明之前，为了执行介入手术，患者将在房间磁共振装置和x射线装置上的房间外壳之间运送。 在两个房间之间长距离运送患者是由于仪器在患者体内移动的风险而引起的; 因为这样的动议可能对病人是致命的。 解决方案在于布置与MR装置（1）相邻的X射线装置（20），使得患者仅需要短距离运输。 MR装置（1）和X射线装置（20）的不希望的相互影响通过屏蔽MR装置的静磁场和由X射线装置产生的电磁场来抵消。
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