SYSTEMS AND METHODS FOR CELL MEASUREMENT UTILIZING ULTRASHORT T2*
    1.
    发明申请
    SYSTEMS AND METHODS FOR CELL MEASUREMENT UTILIZING ULTRASHORT T2* 审中-公开
    使用ULTRASHORT T2的电池测量系统和方法*

    公开(公告)号:US20090111140A1

    公开(公告)日:2009-04-30

    申请号:US12295386

    申请日:2007-03-22

    IPC分类号: C12Q1/02 C12M1/34

    摘要: The present disclosure is directed to a new technique for MR measurement of ultrashort T2* relaxation utilizing spin-echo acquisition. The ultrashort T2* relaxometry can be used for the quantification of highly concentrated iron labeled cells in cell trafficking and therapy. In an exemplary embodiment, a signal is induced by a low flip angle RF pulse. Following excitation pulse, a gradient readout is applied to form an echo. The time between the RF pulse and the center of the gradient readout is defined as TE. In tissues with highly concentrated iron labeled cells, T2* could be below 1 millisecond. Therefore, the signal can be decayed to a noise level with an echo time of a couple milliseconds. Because T2 is much longer in SPIO labeled cells, the signal acquired by spin echo is much bigger than that from the gradient echo, thus avoiding the negative effects associated with the massive signal loss in the image. The ultrashort T2* relaxation map can then by overlaid on the regular T2* map to generate the final T2* map of the field of view.

    摘要翻译: 本公开涉及一种利用自旋回波采集的超短T2 *弛豫的MR测量的新技术。 超短T2 *松弛测定可用于定量细胞运输和治疗中高度浓缩的铁标记细胞。 在示例性实施例中,信号由低翻转RF脉冲引起。 在激发脉冲之后,应用梯度读数以形成回波。 RF脉冲与梯度读数中心之间的时间定义为TE。 在具有高浓度铁标记细胞的组织中,T2 *可能低于1毫秒。 因此,信号可以衰减到具有几毫秒的回波时间的噪声水平。 因为T2在SPIO标记的细胞中长得多,所以通过自旋回波获取的信号要比梯度回波大得多,因此避免了与图像中大量信号丢失相关的负面影响。 然后可以将超短T2 *弛豫图覆盖在常规T2 *图上,以产生视场的最终T2 *图。

    Multiple contrast agent injection for imaging
    2.
    发明授权
    Multiple contrast agent injection for imaging 有权
    多重造影剂注射成像

    公开(公告)号:US08175678B2

    公开(公告)日:2012-05-08

    申请号:US12066510

    申请日:2006-09-07

    IPC分类号: A61B5/055

    摘要: MRI based molecular imaging is strongly supported by the accurate quantification of contrast agents. According to an exemplary embodiment of the present invention, contrast agent is applied on the basis of a multiple injection application scheme, during which changes in relaxation rate are determined. This may provide for an accurate determination of tumor vascularity via MRI relaxometry.

    摘要翻译: 通过造影剂的准确定量强烈支持基于MRI的分子成像。 根据本发明的示例性实施方案,在多次注射施用方案的基础上应用造影剂,在此期间确定松弛率的变化。 这可以通过MRI弛豫测定来准确地确定肿瘤血管。

    MR METHOD FOR THE QUANTITATIVE DETERMINATION OF LOCAL RELAXATION TIME VALUES
    3.
    发明申请
    MR METHOD FOR THE QUANTITATIVE DETERMINATION OF LOCAL RELAXATION TIME VALUES 审中-公开
    用于定量确定局部放松时间值的方法

    公开(公告)号:US20090227860A1

    公开(公告)日:2009-09-10

    申请号:US11573408

    申请日:2005-08-08

    IPC分类号: A61B5/055

    摘要: The invention relates to an MR method for the quantitative determination of local relaxation time values in an examination volume. Firstly, a plurality of echo signals (1, 2, 3) with different echo time values (t1, t2, t3) are recorded in a phase-sensitive manner. From these echo signals (1, 2, 3), complex MR images (4, 5, 6) are then reconstructed for the different echo time values (t1, t2, t3). Next, local resonant frequency values (7) are calculated for each image point from the echo-time-dependent change in the phases of the complex image values, and then preliminary local magnetic field inhomogeneity values (8) are calculated from the local resonant frequency values (7). The invention proposes that the local relaxation time values (10) be determined from the echo-time-dependent change in the amplitudes of the image values and correction of the local relaxation time values (10) be carried out taking account of final local magnetic field inhomogeneity values. The preliminary magnetic field inhomogeneity values (8) are used as start values for an iterative optimization procedure (19) for determining the final local magnetic field inhomogeneity values.

    摘要翻译: 本发明涉及用于定量测定检查体积中局部弛豫时间值的MR方法。 首先,以相敏的方式记录具有不同回波时间值(t1,t2,t3)的多个回波信号(1,2,3)。 然后,根据这些回波信号(1,2,3),对于不同的回波时间值(t1,t2,t3)重构复数MR图像(4,5,6)。 接下来,从复图像值的相位的回波 - 时间相关的变化中,针对每个图像点计算局部谐振频率值(7),然后从局部谐振频率计算初步局部磁场不均匀性值(8) 值(7)。 本发明提出,根据图像值幅度的回波 - 时间相关的变化确定局部弛豫时间值(10),并且考虑到最终局部磁场来执行局部弛豫时间值(10)的校正 不均匀性值。 将初步磁场不均匀性值(8)用作用于确定最终局部磁场不均匀性值的迭代优化程序(19)的起始值。

    Multiple Contrast Agent Injection For Imaging
    4.
    发明申请
    Multiple Contrast Agent Injection For Imaging 有权
    多个造影剂注射成像

    公开(公告)号:US20090130023A1

    公开(公告)日:2009-05-21

    申请号:US12066510

    申请日:2006-09-07

    IPC分类号: A61K49/06 G01V3/00

    摘要: MRI based molecular imaging is strongly supported by the accurate quantification of contrast agents. According to an exemplary embodiment of the present invention, contrast agent is applied on the basis of a multiple injection application scheme, during which changes in relaxation rate are determined. This may provide for an accurate determination of tumor vascularity via MRI relaxometry.

    摘要翻译: 通过造影剂的准确定量强烈支持基于MRI的分子成像。 根据本发明的示例性实施方案,在多次注射施用方案的基础上应用造影剂,在此期间确定松弛率的变化。 这可以通过MRI弛豫测定来准确地确定肿瘤血管。

    DETERMINATION OF SUSCEPTIBILITY-INDUCED MAGNETIC FIELD GRADIENTS BY MAGNETIC RESONANCE
    5.
    发明申请
    DETERMINATION OF SUSCEPTIBILITY-INDUCED MAGNETIC FIELD GRADIENTS BY MAGNETIC RESONANCE 审中-公开
    通过磁共振测定可挠性诱导磁场梯度

    公开(公告)号:US20100002926A1

    公开(公告)日:2010-01-07

    申请号:US12522396

    申请日:2008-01-15

    IPC分类号: G06K9/00

    摘要: The invention relates to a device for magnetic resonance imaging of a body (7). The device (1) comprises means (2) for establishing a substantially homogeneous main magnetic field in the examination volume, means (3, 4, 5) for generating switched magnetic field gradients superimposed upon the main magnetic field, means (6) for radiating RF pulses towards the body (7), control means (12) for controlling the generation of the magnetic field gradients and the RF pulses, means (10) for receiving and sampling magnetic resonance signals, and reconstruction means (14) for forming MR images from the signal samples. In accordance with the invention, the device is arranged to a) generate a series of MR echo signals (20) by subjecting at least a portion of the body (7) to an MR imaging sequence of RF pulses and switched magnetic field gradients, b) acquire the MR echo signals for reconstructing an MR image data set (21) therefrom, c) calculate a gradient map (22) by computing echo shift parameters (SPx, SPy, SPz) from subsets of the MR image data set, the echo shift parameters (SPx, SPy, SPz) indicating magnetic field gradient induced shifts of the echo positions in k-space, wherein each subset comprises a number (n) of spatially adjacent pixel or voxel values of the MR image data set (21).

    摘要翻译: 本发明涉及一种用于身体(7)的磁共振成像的装置。 装置(1)包括用于在检查体积中建立基本均匀的主磁场的装置(2),用于产生叠加在主磁场上的开关磁场梯度的装置(3,4,5),用于辐射的装置(6) 朝向身体的射频脉冲(7),用于控制磁场梯度和RF脉冲的产生的控制装置(12),用于接收和采样磁共振信号的装置(10)和用于形成MR图像的重构装置(14) 从信号样本。 根据本发明,该装置被设置成:a)通过使身体(7)的至少一部分经受RF脉冲和切换的磁场梯度的MR成像序列来产生一系列MR回波信号(20),b 获取用于重建MR图像数据集(21)的MR回波信号,c)通过从MR图像数据集的子集计算回波移位参数(SPx,SPy,SPz)来计算梯度图(22),回波 指示在k空间中回波位置的磁场梯度引起的移位的移位参数(SPx,SPy,SPz),其中每个子集包括MR图像数据集(21)的空间相邻像素的数量(n)或体素值。

    DETERMINATION OF SUSCEPTIBILITY-INDUCED MAGNETIC FIELD GRADIENTS BY MAGNETIC RESONANCE
    7.
    发明申请
    DETERMINATION OF SUSCEPTIBILITY-INDUCED MAGNETIC FIELD GRADIENTS BY MAGNETIC RESONANCE 审中-公开
    通过磁共振测定可挠性诱导磁场梯度

    公开(公告)号:US20090131781A1

    公开(公告)日:2009-05-21

    申请号:US12297533

    申请日:2007-04-02

    IPC分类号: A61B5/055

    摘要: The invention relates to a device for magnetic resonance imaging of a body (7). The device (1) comprises means (2) for establishing a substantially homogeneous main magnetic field in the examination volume, means (3, 4, 5) for generating switched magnetic field gradients superimposed upon the main magnetic field, means (6) for radiating RF pulses towards the body (7), control means (12) for controlling the generation of the magnetic field gradients and the RF pulses, means (10) for receiving and sampling magnetic resonance signals, and reconstruction means (14) for forming MR images from the signal samples. In accordance with the invention, the device is arranged to a) generate a series of MR echo signals (20) by subjecting at least a portion of the body (7) to an MR imaging sequence of RF pulses and switched magnetic field gradients, b) acquire the MR echo signals for reconstructing an MR image data set (21) therefrom, c) calculate a gradient map (22) by computing echo shift parameters (SPx, SPy, SPz) from subsets of the MR image data set, the echo shift parameters (SPx, SPy, SPz) indicating magnetic field gradient induced shifts of the echo positions in k-space, wherein each subset comprises a number (n) of spatially adjacent pixel or voxel values of the MR image data set (21).

    摘要翻译: 本发明涉及一种用于身体(7)的磁共振成像的装置。 装置(1)包括用于在检查体积中建立基本均匀的主磁场的装置(2),用于产生叠加在主磁场上的开关磁场梯度的装置(3,4,5),用于辐射的装置(6) 朝向身体的射频脉冲(7),用于控制磁场梯度和RF脉冲的产生的控制装置(12),用于接收和采样磁共振信号的装置(10)和用于形成MR图像的重构装置(14) 从信号样本。 根据本发明,该装置被设置成:a)通过使身体(7)的至少一部分经受RF脉冲和切换的磁场梯度的MR成像序列来产生一系列MR回波信号(20),b 获取用于重建MR图像数据集(21)的MR回波信号,c)通过从MR图像数据集的子集计算回波移位参数(SPx,SPy,SPz)来计算梯度图(22),回波 指示在k空间中回波位置的磁场梯度引起的移位的移位参数(SPx,SPy,SPz),其中每个子集包括MR图像数据集(21)的空间相邻像素的数量(n)或体素值。

    Determination of Distribution Information of a Contrast Agent by Mr Molecular Imaging
    8.
    发明申请
    Determination of Distribution Information of a Contrast Agent by Mr Molecular Imaging 审中-公开
    通过分子成像确定对比剂的分布信息

    公开(公告)号:US20080272779A1

    公开(公告)日:2008-11-06

    申请号:US11915626

    申请日:2006-05-24

    IPC分类号: G01R33/50

    CPC分类号: G01R33/5601 G01R33/50

    摘要: MR based molecular imaging is used for the quantification of contrast agent concentrations. According to an exemplary embodiment of the present invention, a difference between R2 and R2* relaxation rates of a contrast agent is determined on the basis of data measured after contrast agent application. This may provide for an in vivo information relating to a compartmentalization or binding status of the contrast agent, and thus may improve the significance of the examination result.

    摘要翻译: 基于MR的分子成像用于定量造影剂浓度。 根据本发明的一个示例性实施方案,根据造影剂施用后测量的数据确定造影剂的R2和R2 *松弛率之间的差异。 这可以提供与造影剂的分隔或结合状态相关的体内信息,从而可以提高检查结果的重要性。

    PASSIVE MR VISUALISATION OF INTERVENTIONAL INSTRUMENTS
    10.
    发明申请
    PASSIVE MR VISUALISATION OF INTERVENTIONAL INSTRUMENTS 审中-公开
    传统仪器的被动MR可视化

    公开(公告)号:US20090080750A1

    公开(公告)日:2009-03-26

    申请号:US12297649

    申请日:2007-04-17

    IPC分类号: G06K9/00

    CPC分类号: G01R33/286

    摘要: The invention relates to a device for magnetic resonance imaging of a body (7), wherein the device (1) is arranged to a) generate a series of MR echo signals (20) by subjecting at least a portion of the body (7) to an MR imaging sequence comprising RF pulses and switched magnetic field gradients, b) acquire the MR echo signals for reconstructing an MR image (21) therefrom, c) calculate a susceptibility gradient map (22) from the MR echo signals or from the MR image (21), the susceptibility gradient map (22) indicating local susceptibility induced magnetic field gradients, d) determine the position of an interventional instrument (16) having paramagnetic or ferromagnetic properties from the susceptibility gradient map (22).

    摘要翻译: 本发明涉及一种用于身体(7)的磁共振成像的装置,其中所述装置(1)被布置成:a)通过对所述主体(7)的至少一部分进行承受来产生一系列MR回波信号(20) 涉及包括RF脉冲和切换磁场梯度的MR成像序列,b)获取用于重构MR图像(21)的MR回波信号,c)从MR回波信号或从MR回波信号计算磁敏度梯度图(22) 图像(21),表示局部敏感性感应磁场梯度的磁敏度梯度图(22),d)从磁敏度梯度图(22)确定具有顺磁性或铁磁性质的介入仪器(16)的位置。