公开(公告)号：US07772843B2

公开(公告)日：2010-08-10

申请号：US11989243

申请日：2006-07-13

申请人： Franz Hebrank ,  Thorsten Speckner ,  Axel vom Endt

发明人： Franz Hebrank ,  Thorsten Speckner ,  Axel vom Endt

IPC分类号： G01V3/00

CPC分类号： G01R33/56518

摘要： In one embodiment a method for processing a reconstruction image is disclosed. The method includes recording the reconstruction image by a magnetic resonance device having a gradient coil to generate a gradient field. The method further includes distortion-correcting the reconstruction image. The method further includes back-transforming the distortion-corrected reconstruction image, by an image processing device, into a distortion-uncorrected reconstruction image, the back-transforming uses a first algorithm or a second algorithm including a second input value associated with the measurement signal, the second input value being a fictitious gradient field value associated with a distorted measuring point at which the measurement signal is processed, and the second input value is raised or lowered by a nonlinear field component of the real gradient field compared with a linear ideal gradient field.

摘要翻译： 在一个实施例中，公开了一种用于处理重建图像的方法。 该方法包括通过具有梯度线圈的磁共振装置记录重建图像以产生梯度场。 该方法还包括对重建图像进行失真校正。 该方法还包括将失真校正的重建图像由图像处理装置反向变换为失真未校正的重建图像，反向变换使用包括与测量信号相关联的第二输入值的第一算法或第二算法 ，第二输入值是与处理测量信号的失真测量点相关联的虚拟梯度场值，并且第二输入值与实际梯度场的非线性场分量相比，与线性理想梯度相比升高或降低 领域。

公开(公告)号：US06169403A

公开(公告)日：2001-01-02

申请号：US09300782

申请日：1999-04-27

申请人： Franz Hebrank ,  Matthias Gebhardt ,  Helmut Lenz

发明人： Franz Hebrank ,  Matthias Gebhardt ,  Helmut Lenz

IPC分类号： G01V300

CPC分类号： A61N2/02 ,  G01R33/385 ,  G01R33/3852

摘要： A method or apparatus for the simulation of electrical stimulations in an examination subject which are generated by rapidly switched gradient fields of an MR device, and wherein aborting of the executed measuring sequence occurs given the crossing of a threshold value in an online monitoring, wherein the crossing of the threshold value is signaled prior to the execution of the measuring sequence in a look-ahead monitoring, at least one gradient signal G(t) is determined which is defined by the time characteristic of the gradient pulses, at least one first filtered gradient signal GF1(t) is formed by filtering the gradient signal G(t) with a first filtering function fF1(t) a stimulation signal Stim(t) is formed which describes the stimulation of the examination subject, from the first filtered gradient signal GF1(t), and the stimulation signal Stim(t) is compared to a definable stimulation threshold value Stimlim. If Stimlim is exceeded an indicator indicating that a stimulation has occurred is emitted.

摘要翻译： 一种用于模拟检查对象中的电刺激的方法或装置，其由MR装置的快速切换的梯度场产生，并且其中，在线上监测中交叉出阈值时，发生执行的测量序列的中止，其中 在先行监视中执行测量序列之前用信号通知阈值的交叉，确定由梯度脉冲的时间特性定义的至少一个梯度信号G（t），至少一个第一滤波 通过用第一滤波函数fF1（t）对梯度信号G（t）进行滤波来形成梯度信号GF1（t），形成从第一滤波梯度信号描述检查对象的刺激的刺激信号Stim（t） GF1（t），刺激信号Stim（t）与可定义的刺激阈值Stimlim进行比较。 如果超过Stimlim，则发出指示发生刺激的指示符。