Method for magnetic resonance imaging with correction for fluctuations in the tramsission field strength
    31.
    发明授权
    Method for magnetic resonance imaging with correction for fluctuations in the tramsission field strength 有权
    磁共振成像方法,用于校正电场强度的波动

    公开(公告)号:US07233145B2

    公开(公告)日:2007-06-19

    申请号:US10256415

    申请日:2002-09-27

    IPC分类号: G01V3/00

    摘要: In a method for magnetic resonance imaging, whereby magnetic resonance signals in a region of interest of an examination subject are generated in an examination by applying radio-frequency pulses of a first transmission field strength and the magnetic resonance signals are acquired in a spatially coded manner and allocated to volume elements of the region of interest in order to obtain one or more magnetic resonance images of the region of interest, the sensitivity of each volume element of the region of interest with respect to a modification of the first transmission field strength is determined, deviations of the first transmission field strength from a reference field strength are measured during the examination, and the magnetic resonance signals acquired in the examination are corrected on the basis of the sensitivity determined for each volume element and on the basis of the measured deviations of the first transmission field strength from the reference field strength. The method enables the implementation of fMRI measurements with high precision given fluctuating transmission field strength.

    摘要翻译: 在一种磁共振成像方法中,通过施加第一透射场强度的射频脉冲,在检查中产生感兴趣区域的磁共振信号,并以空间编码的方式获取磁共振信号 并分配给感兴趣区域的体积元素以获得感兴趣区域的一个或多个磁共振图像,确定感兴趣区域的每个体积元素相对于第一透射场强度的修改的灵敏度 在检查期间测量第一透射场强度与参考场强的偏差,并且基于为每个体积元确定的灵敏度并且基于测量的偏差来校正在检查中获取的磁共振信号 第一传输场强从参考场强度。 该方法使得能够在给定波动的传输场强下以高精度实现fMRI测量。

    Paired optically variable security element
    34.
    发明授权
    Paired optically variable security element 有权
    配对光学可变安全元件

    公开(公告)号:US08998265B2

    公开(公告)日:2015-04-07

    申请号:US13122285

    申请日:2009-09-16

    摘要: Paired optically variable security element which includes first and second optically variable thin-film multilayer interference devices in the form of optically variable foils or of printings made with inks having optically variable interference pigments. The first and second interference devices exhibit spectral matching at a determined angle of incidence. Sets of optically variable devices and of coating compositions include optically variable pigments for the production of the paired optically variable security element. Moreover, the security element can be used for the protection of documents and goods, and security documents and goods.

    摘要翻译: 成对的光学可变安全元件,其包括以光学可变箔片形式的第一和第二光学可变薄膜多层干涉装置或由具有光学可变干涉颜料的油墨制成的印刷品。 第一和第二干涉装置在确定的入射角处表现出光谱匹配。 一组光学可变装置和涂料组合物包括用于生产成对的光学可变安全元件的光学可变颜料。 此外,安全要素可用于保护文件和货物,以及安全文件和货物。

    Method and device for phase-sensitive flow measurement by a magnetic resonance
    35.
    发明授权
    Method and device for phase-sensitive flow measurement by a magnetic resonance 有权
    通过磁共振对相敏流量测量的方法和装置

    公开(公告)号:US08798942B2

    公开(公告)日:2014-08-05

    申请号:US12975840

    申请日:2010-12-22

    CPC分类号: G01R33/56316 G01R33/56383

    摘要: In a method and a device for phase-sensitive flow measurement of a volume segment of an examination subject in a measurement system, the volume segment is divided into multiple partial volume segments and the following steps are executed repeatedly until the volume segment has been completely measured: movement of a table such that a center of one of the partial volume segments to be measured essentially corresponds to the isocenter of the magnetic resonance system, and implementation of the phase-sensitive flow measurement for the partial volume segment to be measured while the center of the partial volume segment essentially corresponds to the isocenter.

    摘要翻译: 在用于测量系统中的检查对象的体积段的相敏度流量测量的方法和装置中,将体积段划分成多个部分体积段,并且重复执行以下步骤,直到体积段已被完全测量 :使得要测量的部分体积段中的一个的中心基本上对应于磁共振系统的等角点的台的移动,以及在中心处测量的部分体积段的相敏流测量的实现 的部分体积段基本上对应于等角点。

    Dynamic Image Reconstruction with Tight Frame Learning
    36.
    发明申请
    Dynamic Image Reconstruction with Tight Frame Learning 有权
    动态图像重建与紧帧学习

    公开(公告)号:US20140097845A1

    公开(公告)日:2014-04-10

    申请号:US14027451

    申请日:2013-09-16

    IPC分类号: G01R33/48 G06T5/50

    摘要: A computer-implemented method for learning a tight frame includes acquiring undersampled k-space data over a time period using an interleaved process. An average of the undersampled k-space data is determined and a reference image is generated based on the average of the undersampled k-space data. Next, a tight frame operator is determined based on the reference image. Then, a reconstructed image data is generated from the undersampled k-space data via a sparse reconstruction which utilizes the tight frame operator.

    摘要翻译: 用于学习紧帧的计算机实现的方法包括使用交错处理在一段时间内获取欠采样的k空间数据。 确定欠采样的k空间数据的平均值,并且基于欠采样的k空间数据的平均值生成参考图像。 接下来,基于参考图像确定紧帧运算符。 然后,通过使用紧帧运算符的稀疏重构,从欠采样的k空间数据生成重建的图像数据。

    MAGNETIC ORIENTING AND PRINTING
    40.
    发明申请
    MAGNETIC ORIENTING AND PRINTING 有权
    磁性定向和印刷

    公开(公告)号:US20120055355A1

    公开(公告)日:2012-03-08

    申请号:US13133850

    申请日:2009-12-10

    IPC分类号: B05C17/06 B42D15/00 B41M1/12

    摘要: The invention discloses a device and a process for producing indicia comprising magnetically oriented magnetic or magnetizable particles in an ink or coating composition on a sheet of substrate material. The device comprises a flat-bed screen-printing unit having a flat printing screen and a printing platen for receiving said sheet, the printing platen having an upper surface facing the printing screen and a first direction along its upper surface along which said sheet is unloadable, and a magnetic orienting unit comprising multiple magnet assemblies. The magnetic orienting unit is disposed below the upper surface of the printing platen, said multiple magnet assemblies are disposed along said first direction, and all of said magnet assemblies are concomitantly movable from a first position away from the upper surface of the printing platen to a second position close to the upper surface of the printing platen.The magnetic orienting unit comprising one or more magnet assemblies can also be used as a stand-alone flat-bed magnetization device, subsequent to the printing process, e.g. as an additional process station following a conventional flat-bed or rotary screen printing unit. Processes of producing printed documents using the disclosed devices are shown as well.

    摘要翻译: 本发明公开了一种用于制造标记的装置和方法,该标记包括在基片材料片上的油墨或涂层组合物中的磁性取向的磁性或可磁化颗粒。 该装置包括具有平面印刷丝网的平板丝网印刷单元和用于接收所述片材的印刷台板,所述印刷台板具有面向印刷丝网的上表面和沿其上表面的第一方向,所述片材不可在该第一方向上卸载 以及包括多个磁体组件的磁性定向单元。 磁性定向单元设置在印版的上表面的下方,所述多个磁体组件沿着所述第一方向设置,并且所有磁体组件可以从远离印刷版的上表面的第一位置同时移动到 第二位置靠近印版的上表面。 包括一个或多个磁体组件的磁性定向单元也可以在打印过程之后用作独立的平床磁化装置。 作为跟随常规平板或旋转丝网印刷单元的附加处理站。 还示出了使用所公开的设备制作打印文档的过程。