公开(公告)号：US06400152B1

公开(公告)日：2002-06-04

申请号：US09494644

申请日：2000-01-31

申请人： Harvey Ellis Cline ,  Xuli Zong ,  Neville D. Gai

发明人： Harvey Ellis Cline ,  Xuli Zong ,  Neville D. Gai

IPC分类号： G01V300

CPC分类号： G01R33/446

摘要： An apparatus and method for Magnetic Resonance Imaging (MRI) by spiral trajectory scanning comprises an MR imaging device for acquiring and processing data samples of an object to be imaged, wherein the data samples are acquired by spiral trajectory scanning. An interface is coupled to the MR imaging device for receiving operator-defined spiral scanning parameters, and a computer is coupled to the interface and the MR imaging device. The computer is configured to generate an approximated spiral trajectory in k-space in accordance with operator-defined spiral scanning parameters. The approximated spiral trajectory is used by the MR imaging system to perform spiral trajectory scanning.

摘要翻译： 用于通过螺旋轨迹扫描的磁共振成像（MRI）的装置和方法包括用于获取和处理待成像对象的数据样本的MR成像装置，其中通过螺旋轨迹扫描获取数据样本。 接口耦合到MR成像设备，用于接收操作者定义的螺旋扫描参数，并且计算机耦合到接口和MR成像设备。 计算机被配置为根据操作者定义的螺旋扫描参数在k空间中生成近似的螺旋轨迹。 近似的螺旋轨迹由MR成像系统用于执行螺旋轨迹扫描。

公开(公告)号：US06291997B1

公开(公告)日：2001-09-18

申请号：US09452440

申请日：1999-12-02

申请人： Kevin F. King ,  Alexander Ganin ,  Neville D. Gai

发明人： Kevin F. King ,  Alexander Ganin ,  Neville D. Gai

IPC分类号： G01V300

CPC分类号： G01R33/56518 ,  G01R33/3852

摘要： Image artifacts produced by residual magnetization in elements of the gradient field amplifier system are reduced by driving the residual magnetization to a preselected value at the end of each imaging pulse sequence. Reset gradient pulses are produced by the gradient field amplifier system after each signal is acquired to drive the residual magnetization to a selected value. A number of different reset gradient waveforms may be used, and they may be produced in a number of different ways.

摘要翻译： 通过在每个成像脉冲序列结束时将残余磁化驱动到预选值，减少梯度场放大器系统的元件中由残余磁化产生的图像伪影。 在获取每个信号之后，由梯度场放大器系统产生复位梯度脉冲以将剩余磁化驱动到所选择的值。 可以使用多个不同的复位梯度波形，并且它们可以以多种不同的方式产生。