公开(公告)号：US20050110490A1

公开(公告)日：2005-05-26

申请号：US10957822

申请日：2004-10-04

申请人： Qun Zhao ,  G. Duensing ,  Hu Cheng ,  William Edelstein

发明人： Qun Zhao ,  G. Duensing ,  Hu Cheng ,  William Edelstein

IPC分类号： G01R33/32 ,  G01R33/58 ,  G01V3/00 ,  A61B5/05

CPC分类号： G01R33/32 ,  G01R33/4806 ,  G01R33/58

摘要： The subject invention relates to a method and apparatus for producing stimulated MRI data. In an embodiment, a remote-controlled “smart phantom” can produce simulated data. The simulated data can be acquired from a MRI system. The subject device can generate control signals and send the generated control signals to secondary coils/probes placed in the subject smart phantom. The control signals determine the current flow in the secondary coils/probes, which act as local spin magnetization amplifiers and thus produce regions of variable contrast to noise ratio. The control signals can be generated with various parameters, such as BOLD models, different levels of contrast-to-noise ratio (CNR), signal intensities, and physiological signals. Comparisons can be made with the widely-used simulated data by computers. Validation of the subject smart phantom can be performed with both theoretical analysis and data of human subjects.

摘要翻译： 本发明涉及一种用于产生模拟MRI数据的方法和装置。 在一个实施例中，远程控制的“智能幻影”可以产生模拟数据。 可以从MRI系统获取模拟数据。 主体装置可以产生控制信号，并将产生的控制信号发送到放置在主体智能幻影中的次级线圈/探头。 控制信号确定次级线圈/探头中的电流，其作为局部自旋磁化放大器，从而产生可变对比度噪声比的区域。 控制信号可以用诸如BOLD模型，不同等级的对比噪声比（CNR），信号强度和生理信号等各种参数产生。 可以用计算机广泛使用的模拟数据进行比较。 可以通过理论分析和人类受试者的数据进行主体智能幻影的验证。

公开(公告)号：US20070088211A1

公开(公告)日：2007-04-19

申请号：US11452605

申请日：2006-06-13

申请人： Hu Cheng ,  Qun Zhao ,  William Edelstein ,  G. Duensing

发明人： Hu Cheng ,  Qun Zhao ,  William Edelstein ,  G. Duensing

IPC分类号： A61B5/05

CPC分类号： A61B5/055

摘要： The subject invention relates to a method and apparatus for producing stimulated MRI data. In an embodiment, a remote-controlled “smart phantom” can produce simulated data. The simulated data can be acquired from a MRI system. The subject device can generate control signals and send the generated control signals to secondary coils/probes placed in the subject smart phantom. The control signals determine the current flow in the secondary coils/probes, which act as local spin magnetization amplifiers and thus produce regions of variable contrast to noise ratio. The control signals can be generated with various parameters, such as BOLD models, different levels of contrast-to-noise ratio (CNR), signal intensities, and physiological signals. Comparisons can be made with the widely-used simulated data by computers. Validation of the subject smart phantom can be performed with both theoretical analysis and data of human subjects.

摘要翻译： 本发明涉及用于产生刺激的MRI数据的方法和装置。 在一个实施例中，远程控制的“智能幻影”可以产生模拟数据。 可以从MRI系统获取模拟数据。 主体装置可以产生控制信号，并将产生的控制信号发送到放置在主体智能幻影中的次级线圈/探头。 控制信号确定次级线圈/探头中的电流，其作为局部自旋磁化放大器，从而产生可变对比度噪声比的区域。 控制信号可以用诸如BOLD模型，不同等级的对比噪声比（CNR），信号强度和生理信号等各种参数产生。 可以用计算机广泛使用的模拟数据进行比较。 可以通过理论分析和人类受试者的数据进行主体智能幻影的验证。

公开(公告)号：US09791489B2

公开(公告)日：2017-10-17

申请号：US14005804

申请日：2012-03-22

申请人： Paul A. Bottomley ,  William Edelstein ,  Abdel-Monem M. El-Sharkawy ,  Di Qian

发明人： Paul A. Bottomley ,  William Edelstein ,  Abdel-Monem M. El-Sharkawy ,  Di Qian

IPC分类号： G01R27/32 ,  G01R21/00 ,  G01R33/36 ,  A61N1/00 ,  G06F1/00 ,  G01R1/00 ,  G01R21/10 ,  G01R33/28

CPC分类号： G01R27/32 ,  A61N1/00 ,  G01R1/00 ,  G01R21/00 ,  G01R21/10 ,  G01R33/288 ,  G01R33/3614 ,  G06F1/00 ,  G06F2101/00

摘要： A device with at least one channel for measuring high dynamic range, radio frequency (RF) power levels over broad-ranging duty cycles includes a power sensor circuit comprising at least one logarithmic amplifier; at least one directional RF coupler electrically connected to the at least one power sensor; at least one RF attenuator electrically connected to the at least one RF coupler; and at least one sampling circuit electrically connected to the at least one RF attenuator and the at least one RF coupler. The at least one sampling circuit performs analog-to-digital conversion of electrical signals received to provide digitals signals for measuring the RF power level in the at least one channel.

公开(公告)号：US20050046422A1

公开(公告)日：2005-03-03

申请号：US10925691

申请日：2004-08-25

申请人： William Edelstein ,  Tesfaye Kidane ,  Victor Taracilla ,  Tanvir Baig ,  Timothy Eagan ,  Robert Brown

发明人： William Edelstein ,  Tesfaye Kidane ,  Victor Taracilla ,  Tanvir Baig ,  Timothy Eagan ,  Robert Brown

IPC分类号： G01R33/385 ,  G01R33/421 ,  G01V3/00

CPC分类号： G01R33/3854 ,  G01R33/4215

摘要： The present invention provides an apparatus for reducing acoustic noise in a magnetic resonance imaging device including passive shielding located outside the actively shielded gradient winding elements in order to reduce the magnitude of fields that spread outside the gradient coil assembly in unwanted directions and interact with the magnet cryostat or other metallic magnet parts, inducing eddy currents that cause consequent acoustic noise. The passive shielding elements are conducting layers located on the outer radius of the cylindrical gradient coil assembly in a cylindrical magnet system, conducting layers located at the ends of the gradient coil assembly in a cylindrical magnet system, and conducting layers located inside the actively shielded gradient winding inner elements in a cylindrical magnet system. The passive shielding could also be located on separate structures that are vibrationally isolated from the magnet cryostat. The actively shielded gradient winding can also be extended to portions at the ends of the actively shielded gradient winding and further to portions inside the inner radius of the inner portion of the actively shielded gradient winding. The actively shielded gradient windings and passive shielding should be designed concurrently in order to substantially optimize the gradient linearity and reduce the eddy currents generated in metallic parts of the magnetic resonance imaging system.

摘要翻译： 本发明提供了一种用于降低磁共振成像装置中的声学噪声的装置，其包括位于主动屏蔽梯度绕组元件外部的无源屏蔽，以便减小在不需要的方向上扩展到梯度线圈组件外部的场的幅度并与磁体相互作用 低温恒温器或其他金属磁体部件，引起导致声音噪声的涡流。 无源屏蔽元件是位于圆柱形磁体系统中的圆柱形梯度线圈组件的外半径上的导电层，位于梯形线圈组件的端部的导电层位于圆柱形磁体系统中，导电层位于主动屏蔽梯度内 在圆柱形磁体系中缠绕内部元件。 被动屏蔽也可以位于与磁体低温恒温器振动隔离的分离结构上。 主动屏蔽的梯度绕组还可以延伸到主动屏蔽的梯度绕组的端部的部分，并且还可以延伸到主动屏蔽的梯度绕组的内部的内半径内的部分。 主动屏蔽梯度绕组和无源屏蔽应同时设计，以便基本上优化梯度线性并减少在磁共振成像系统的金属部分中产生的涡流。

公开(公告)号：US20140015547A1

公开(公告)日：2014-01-16

申请号：US14005804

申请日：2012-03-22

申请人： Paul A. Bottomley ,  William Edelstein ,  Abdel-Monem M. El-Sharkawy ,  Di Qian

发明人： Paul A. Bottomley ,  William Edelstein ,  Abdel-Monem M. El-Sharkawy ,  Di Qian

IPC分类号： G01R27/32

CPC分类号： G01R27/32 ,  A61N1/00 ,  G01R1/00 ,  G01R21/00 ,  G01R21/10 ,  G01R33/288 ,  G01R33/3614 ,  G06F1/00 ,  G06F2101/00

摘要： A device with at least one channel for measuring high dynamic range, radio frequency (RF) power levels over broad-ranging duty cycles includes a power sensor circuit comprising at least one logarithmic amplifier; at least one directional RF coupler electrically connected to the at least one power sensor; at least one RF attenuator electrically connected to the at least one RF coupler; and at least one sampling circuit electrically connected to the at least one RF attenuator and the at least one RF coupler. The at least one sampling circuit performs analog-to-digital conversion of electrical signals received to provide digitals signals for measuring the RF power level in the at least one channel.

摘要翻译： 具有用于在宽范围占空比范围内测量高动态范围射频（RF）功率电平的至少一个通道的装置包括功率传感器电路，其包括至少一个对数放大器; 至少一个定向RF耦合器电连接到所述至少一个功率传感器; 至少一个RF衰减器，电连接到所述至少一个RF耦合器; 以及电连接到所述至少一个RF衰减器和所述至少一个RF耦合器的至少一个采样电路。 所述至少一个采样电路对所接收的电信号执行模数转换，以提供用于测量所述至少一个通道中的RF功率电平的数字信号。