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公开(公告)号：EP0757255A2
公开(公告)日：1997-02-05
申请号：EP96304988.7
申请日：1996-07-05
CPC分类号： G01R33/285 , A61B34/20 , A61B90/10 , A61B2034/2051 , A61B2090/374
摘要： An imaging system comprising: imaging apparatus for obtaining an image of an internal part of an object placed in an examination region of the imaging apparatus; a reference frame which carries a radiation sensing arrangement and is fixed with respect to a treatment position; a tool which is required to be accurately positioned with respect to the object when the object is in the treatment position; a radiation emitting arrangement associated with the tool which emits radiation for detection by the sensing arrangement to produce signals indicative of the position of the tool with respect to the reference frame; and display means for displaying said image of the object and utilising said signals produced by said sensing arrangement to provide a representation of said tool in said display at a position and orientation with respect to said image of the object corresponding to the position and orientation of the tool with respect to the actual object; characterised in that said reference frame and hence said treatment position is fixed in position with respect to said examination region.
摘要翻译： 1。一种成像系统，包括：成像装置，用于获得放置在所述成像装置的检查区域中的物体的内部部分的图像; 参考框架，其承载辐射感测装置并相对于治疗位置固定; 当物体处于治疗位置时需要相对于物体精确定位的工具; 与所述工具相关联的辐射发射装置，所述辐射发射装置发射用于由所述感测装置进行检测的辐射，以产生指示所述工具相对于所述参考框架的位置的信号; 以及显示装置，用于显示所述物体的所述图像，并利用由所述传感装置产生的所述信号在所述显示器中提供相对于所述物体的所述图像的位置和取向的所述工具的表示，所述物体的图像对应于所述物体的位置和取向 相对于实际对象的工具; 其特征在于，所述参考框架以及因此所述治疗位置相对于所述检查区域固定就位。
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公开(公告)号：EP0757255B1
公开(公告)日：2000-09-06
申请号：EP96304988.7
申请日：1996-07-05
CPC分类号： G01R33/285 , A61B34/20 , A61B90/10 , A61B2034/2051 , A61B2090/374
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公开(公告)号：EP0757255A3
公开(公告)日：1997-04-16
申请号：EP96304988.7
申请日：1996-07-05
CPC分类号： G01R33/285 , A61B34/20 , A61B90/10 , A61B2034/2051 , A61B2090/374
摘要： An imaging system comprising: imaging apparatus for obtaining an image of an internal part of an object placed in an examination region of the imaging apparatus; a reference frame which carries a radiation sensing arrangement and is fixed with respect to a treatment position; a tool which is required to be accurately positioned with respect to the object when the object is in the treatment position; a radiation emitting arrangement associated with the tool which emits radiation for detection by the sensing arrangement to produce signals indicative of the position of the tool with respect to the reference frame; and display means for displaying said image of the object and utilising said signals produced by said sensing arrangement to provide a representation of said tool in said display at a position and orientation with respect to said image of the object corresponding to the position and orientation of the tool with respect to the actual object; characterised in that said reference frame and hence said treatment position is fixed in position with respect to said examination region.
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4.发明公开Magnetic resonance imaging apparatus and methods 失效Apparat und Verfahren zur Bilderzeugung mittels magnetischer Resonanz。
公开(公告)号：EP0616229A1
公开(公告)日：1994-09-21
申请号：EP94300923.3
申请日：1994-02-08
发明人： Zou, Xuemin , Patrick, John L. , McNally, James M.
CPC分类号： G01R33/385 , G01R33/3415 , G01R33/422 , G01R33/54
摘要： Superconducting magnets (10) of a magnetic resonance imager create static magnetic fields through an examination region (12). Gradient magnetic field coils (30) under control of a gradient magnetic field control (42) generate gradient magnetic fields across the examination region (12), as a whole. A plurality of surface coils (36, 38) receive radio frequency signals from each of two distinct subregions within the examination region (12). The two receiver coils are connected with separate receivers (60₁, 60₂) which demodulate the received magnetic resonance signals. The magnetic resonance signals are reconstructed (76) into an imager representation (80, 82) of the first and second subregions. In the embodiment of Figures 1 and 2, a radio frequency transmitter (40) and a whole body coil (32) generate and manipulate the magnetic resonance signals within the first and second subregions. In other embodiments, a plurality of transmitters (40₁, 40₂...) convey RF signals to the surface coils such that the surface coils operate in both a transmit and receive mode. Regardless whether a single transmitter or a series of transmitters is utilized, a sequence control (44) controls the transmitter(s) and the gradient control (42) to conduct conventional magnetic resonance imaging sequences in coordination in both subregions.
摘要翻译： 磁共振成像器的超导磁体（10）通过检查区域（12）产生静态磁场。 在梯度磁场控制（42）的控制下的梯度磁场线圈（30）整体上跨越检查区域（12）产生梯度磁场。 多个表面线圈（36,38）从检查区域（12）内的两个不同子区域中的每一个接收射频信号。 两个接收器线圈与解调所接收的磁共振信号的单独的接收器（601,602）连接。 磁共振信号被重构（76）成为第一和第二子区域的成像器表示（80,82）。 在图1和2的实施例中，射频发射器（40）和全身线圈（32）产生并操纵第一和第二子区域内的磁共振信号。 在其他实施例中，多个发射器（401,402 ...）将RF信号传送到表面线圈，使得表面线圈在发射和接收模式中都工作。 不管使用单个发射机还是一系列发射机，序列控制（44）控制发射机和梯度控制（42）以在两个子区域协调地进行常规磁共振成像序列。
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5.发明公开Magnetic resonance apparatus and methods 失效Apparat und Verfahrenfürmagnetische Resonanzuntersuchungen
公开(公告)号：EP0654675A1
公开(公告)日：1995-05-24
申请号：EP94307885.7
申请日：1994-10-26
CPC分类号： G01R33/56375 , A61B5/055 , G01R33/28 , G01R33/3815 , G01R33/4824 , G01R33/56308 , G01R33/56383 , G01R33/56509
摘要： A magnetic resonance apparatus includes a gantry (A) an incorporating a magnet (12) which generates a uniform magnetic field in a thin (typically under 15 cm thick) imaging volume (10). Gradient coils (30) and radio frequency coils (20) transmit radio frequency and gradient magnetic field pulses of conventional imaging sequences into the imaging volume. A patient support surface (42) moves a patient continuously through the imaging volume as the pulses of the magnetic resonance sequence are applied. A tachometer (52) monitors movement of the patient. A frequency scaler (54) scales the frequency of the RF excitation pulses applied by the transmitter (22) and the demodulation frequency of the receiver (26) in accordance with the patient movement such that the selected slice moves in synchrony with the patient through the imaging volume. The slice select gradient is indexed after magnetic resonance signals to generate a full set of views for reconstruction into a two-dimensional image representation of the slice are generated. The views for each slice are reconstructed (28) into a three-dimensional image representation that is stored in a memory (60). By using rapid imaging techniques, such as echo-planar techniques which can generate a two-dimensional image of a slice in 150 milliseconds, a three-dimensional diagnostic image of a section of a subject one metre long can be generated in less than 2 minutes.
摘要翻译： 一种磁共振设备包括一个结合有磁体（12）的台架（A），该磁体产生薄（通常在15厘米厚以下）成像体积（10）的均匀磁场。 梯度线圈（30）和射频线圈（20）将常规成像序列的射频和梯度磁场脉冲传输到成像体积中。 当应用磁共振序列的脉冲时，患者支撑表面（42）使患者连续移动通过成像体积。 转速计（52）监测患者的运动。 频率缩放器（54）根据患者移动对发射机（22）施加的RF激励脉冲的频率和接收机（26）的解调频率进行缩放，使得所选择的切片通过 成像体积。 在磁共振信号之后索引切片选择梯度，以产生用于重建成二维图像的全部视图，从而生成切片的二维图像表示。 每个切片的视图被重建（28）成存储在存储器（60）中的三维图像表示。 通过使用能够在150毫秒内产生切片的二维图像的回波平面技术的快速成像技术，可以在不到2分钟内产生1米长的对象的一部分的三维诊断图像 。
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公开(公告)号：EP0255220A2
公开(公告)日：1988-02-03
申请号：EP87305114.8
申请日：1987-06-10
CPC分类号： G01R33/56509 , G01F1/716 , G01R33/482 , G01R33/56308 , G01R33/56316
摘要： A pulse sequencer (40) controls a resonance excitation controls circuit (22), an inversion pulse controls circuit (24), a slice select gradient controls circuit (32), a read gradient controls circuit (34), and a phase encode gradient controls circuit (36) to cause an appropriate gradient pulse imaging sequence to be generated to the image region. The operator selects an appropriate imaging sequence such as a spin echo, inversion recovery, multi-echo, gradient echo, or other conventional imaging sequence and the parameters, such as the number of repetitions, from an image pulse sequence and motion desensitization memory (44, 46). In the exemplary pulse sequences of FIGURES 2-4, this memory directs the formation of RF pulses (62, 66), slice selection pulses (60, 64) and read gradient pulse (70), phase encode gradient pulse (72), and the appropriate additional gradient pulses for rephasing signals from one or more of static, constant velocity, accelerating, and pulsatilitory tissue in the image region. By rephasing the magnetic resonance signal components from tissue moving with the selected motion characteristics such that the corresponding moments in time are set equal to zero, motion artifacts from moving tissue are suppressed.
摘要翻译： 脉冲序列器（40）控制共振激励控制电路（22），反相脉冲控制电路（24），切片选择梯度控制电路（32），读梯度控制电路（34）和相位编码梯度控制 电路（36），以对图像区域产生适当的梯度脉冲成像序列。 操作员从图像脉冲序列和运动脱敏存储器（44）中选择适当的成像序列，例如自旋回波，反转恢复，多回波，梯度回波或其他常规成像序列以及诸如重复次数的参数 ，46）。 在图2-4的示例性脉冲序列中，该存储器引导RF脉冲（62,66），切片选择脉冲（60,64）和读梯度脉冲（70），相位编码梯度脉冲（72）的形成，以及 适当的另外的梯度脉冲用于重新定位来自图像区域中的一个或多个静态，恒定速度，加速和脉动组织的信号。 通过用选择的运动特征重新移动来自组织移动的磁共振信号分量，使得相应的时间矩被设置为等于零，来自移动组织的运动伪影被抑制。
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公开(公告)号：EP0429295A3
公开(公告)日：1991-09-25
申请号：EP90312655.5
申请日：1990-11-21
IPC分类号： G01R33/48
CPC分类号： G01R33/4838 , G01R33/485
摘要： RF and gradient pulse combinations (30, 32, 36, 38) are applied to limit or define a region of interest in two dimensions (42) by pre-saturating surrounding regions (34a, 34b, 40a, 40b). A 90° RF pulse (50) is applied in the presence of a slice select gradient (60) to excite selected dipoles in a slice or slab, defining the region of interest or voxel in the third dimension. Phase encoding gradients (62) and (64) are applied to encode spatial position in two dimensions of the slice. A binomial refocusing pulse (52) suppresses the water and refocuses the metabolite resonance into an echo which is acquired (68) by a receiver (26). A Fourier transform means (72, 74) transforms the received magnetic resonance signals to create a two dimensional array (76) or matrix of spectra (78) corresponding to a two dimensional array of spatial positions within the slice. A third phase encode gradient (66) may be applied to encode the region of interest in three dimensions for generating a three dimensional array of the spectra.
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公开(公告)号：EP0429295A2
公开(公告)日：1991-05-29
申请号：EP90312655.5
申请日：1990-11-21
IPC分类号： G01R33/48
CPC分类号： G01R33/4838 , G01R33/485
摘要： RF and gradient pulse combinations (30, 32, 36, 38) are applied to limit or define a region of interest in two dimensions (42) by pre-saturating surrounding regions (34a, 34b, 40a, 40b). A 90° RF pulse (50) is applied in the presence of a slice select gradient (60) to excite selected dipoles in a slice or slab, defining the region of interest or voxel in the third dimension. Phase encoding gradients (62) and (64) are applied to encode spatial position in two dimensions of the slice. A binomial refocusing pulse (52) suppresses the water and refocuses the metabolite resonance into an echo which is acquired (68) by a receiver (26). A Fourier transform means (72, 74) transforms the received magnetic resonance signals to create a two dimensional array (76) or matrix of spectra (78) corresponding to a two dimensional array of spatial positions within the slice. A third phase encode gradient (66) may be applied to encode the region of interest in three dimensions for generating a three dimensional array of the spectra.
摘要翻译： 施加RF和梯度脉冲组合（30,32,36,38）以通过预饱和周围区域（34a，34b，40a，40b）限制或限定二维（42）中的感兴趣区域。 在切片选择梯度（60）的存在下施加90°RF脉冲（50）以在切片或平板中激发所选择的偶极子，在第三维度中定义感兴趣区域或体素。 应用相位编码梯度（62）和（64）来编码切片两维中的空间位置。 二项重新聚焦脉冲（52）抑制水并将代谢物共振重新聚焦成由接收器（26）获取的回波（68）。 傅里叶变换装置（72,74）对接收到的磁共振信号进行变换以产生对应于片内空间位置的二维阵列的二维阵列（76）或光谱矩阵（78）。 可以应用第三相位编码梯度（66）以在三维中编码感兴趣区域，以产生光谱的三维阵列。
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公开(公告)号：EP0255220A3
公开(公告)日：1988-11-30
申请号：EP87305114
申请日：1987-06-10
CPC分类号： G01R33/56509 , G01F1/716 , G01R33/482 , G01R33/56308 , G01R33/56316
摘要： A pulse sequencer (40) controls a resonance excitation controls circuit (22), an inversion pulse controls circuit (24), a slice select gradient controls circuit (32), a read gradient controls circuit (34), and a phase encode gradient controls circuit (36) to cause an appropriate gradient pulse imaging sequence to be generated to the image region. The operator selects an appropriate imaging sequence such as a spin echo, inversion recovery, multi-echo, gradient echo, or other conventional imaging sequence and the parameters, such as the number of repetitions, from an image pulse sequence and motion desensitization memory (44, 46). In the exemplary pulse sequences of FIGURES 2-4, this memory directs the formation of RF pulses (62, 66), slice selection pulses (60, 64) and read gradient pulse (70), phase encode gradient pulse (72), and the appropriate additional gradient pulses for rephasing signals from one or more of static, constant velocity, accelerating, and pulsatilitory tissue in the image region. By rephasing the magnetic resonance signal components from tissue moving with the selected motion characteristics such that the corresponding moments in time are set equal to zero, motion artifacts from moving tissue are suppressed.
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