Method and apparatus for defining a three-dimensional imaging section
    21.
    发明授权
    Method and apparatus for defining a three-dimensional imaging section 有权
    用于定义三维成像部分的方法和装置

    公开(公告)号:US06757417B2

    公开(公告)日:2004-06-29

    申请号:US09748962

    申请日:2000-12-27

    IPC分类号: G06K900

    CPC分类号: G06T17/00

    摘要: A method of defining a three-dimensional imaging section which comprises displaying a plurality of localizer images of the structure of interest, acquiring operator inputs that designate regions on the plurality of localizer images and that correspond to regions within the structure of interest, and determining a volume based on the regions designated by the operator inputs. The volume defines the three-dimensional imaging section, which is a three-dimensional section of a structure of interest.

    摘要翻译: 一种定义三维成像部分的方法,其包括显示所述感兴趣结构的多个定位器图像,获取指示所述多个定位器图像上的区域并且对应于所述感兴趣结构内的区域的操作者输入,以及确定 基于由操作员输入指定的区域的体积。 体积定义三维成像部分,其是感兴趣的结构的三维部分。

    Nutation angle measurement during MRI prescan
    22.
    发明授权
    Nutation angle measurement during MRI prescan 失效
    MRI预扫描期间的营养角度测量

    公开(公告)号:US5416412A

    公开(公告)日:1995-05-16

    申请号:US129822

    申请日:1993-09-30

    摘要: A prescan for an MRI system (FIG. 1) automatically sets the rf power level to produce an excitation field that nutates spins in the image plane the amount prescribed by the scan. Nutation angle is measured with a pulse sequence comprised of three slice selective excitation pulses that produce a set of frequency encoded NMR echo signals (E.sub.1, S.sub.1, E.sub.2, E.sub.23, E.sub.13). Nutation angle is calculated at locations in the image slice from the Fourier transformation of these signals and the maximum nutation angle is employed to calculate the final rf power level setting for the scan.

    摘要翻译: 用于MRI系统的预扫描(图1)自动设置射频功率电平以产生激励场,该激励场将图像平面中的旋转拟合为扫描规定的量。 营养角度是由产生一组频率编码的NMR回波信号(E1,S1,E2,E23,E13)的三个切片选择性激发脉冲组成的脉冲序列测量的。 在这些信号的傅里叶变换的图像切片中的位置处计算营养角度,并且采用最大章动角来计算扫描的最终射频功率电平设置。