Ultra-Short Mri Body Coil
    11.
    发明申请
    Ultra-Short Mri Body Coil 审中-公开
    超短Mri体线圈

    公开(公告)号:US20080161675A1

    公开(公告)日:2008-07-03

    申请号:US11817968

    申请日:2006-03-03

    IPC分类号: A61B5/055

    CPC分类号: G01R33/34046 G01R33/3415

    摘要: A magnetic resonance imaging system (10) utilizes an ultra-short RF body coil (36). The ultra-short body coil (36) is shorter than the mechanical equivalent birdcage coil by at least a factor of two. Such coil provides equivalent (Bt) magnetic field-uniformity, while conforming to SAR limitations.

    摘要翻译: 磁共振成像系统(10)使用超短RF体线圈(36)。 超短体线圈(36)比机械等效鸟笼线圈短至少两倍。 这种线圈在符合SAR限制的情况下提供等效的(B SUB)磁场均匀性。

    Iterative reconstruction for EPI
    12.
    发明授权
    Iterative reconstruction for EPI 失效
    EPI的迭代重建

    公开(公告)号:US06249595B1

    公开(公告)日:2001-06-19

    申请号:US09131905

    申请日:1998-08-10

    IPC分类号: G06K900

    摘要: A method of iterative reconstruction for MRI imaging, comprising: (a) acquiring data into a k-space, wherein some of said data is acquired using an opposite gradient polarity from other of said data; (b) partially reconstructing at least a portion of the data, using a Fourier transform; (c) test reconstructing, at least a portion of an image, from the partially reconstructed data, using a set of reconstruction parameters, comprising at least one reconstruction parameter; (d) measuring an image quality measure of the test reconstructed image; and (e) automatically repeating (c) and (d) for a plurality of sets of reconstruction parameters to determine an acceptable reconstructed image, using the same partially reconstructed data.

    摘要翻译: 一种用于MRI成像的迭代重建方法,包括:(a)将数据采集到k空间中,其中使用与所述其他数据相反的梯度极性获取所述数据中的一些; (b)使用傅立叶变换来部分地重构所述数据的至少一部分; (c)使用包括至少一个重建参数的一组重建参数来测试来自所述部分重建的数据的图像的至少一部分; (d)测量测试重建图像的图像质量测量; 以及(e)使用相同的部分重建的数据自动重复(c)和(d)多个重建参数组以确定可接受的重建图像。

    MR involving high speed coil mode switching between I-channel linear, Q-channel linear, quadrature and anti-quadrature modes
    13.
    发明授权
    MR involving high speed coil mode switching between I-channel linear, Q-channel linear, quadrature and anti-quadrature modes 有权
    涉及在I通道线性,Q通道线性,正交和反正交模式之间进行高速线圈模式切换的MR

    公开(公告)号:US07990149B2

    公开(公告)日:2011-08-02

    申请号:US12297658

    申请日:2007-04-03

    IPC分类号: G01V3/00

    摘要: Hybrid circuitry (40, 40′, 40″) for operatively coupling a radio frequency drive signal (70) with a quadrature coil (30) is configurable in one of at least two coil modes of a group consisting of: (i) a linear I channel mode in which an I channel input port (42) is driven without driving a Q channel input port (44); (ii) a linear Q channel mode in which the Q channel input port is driven without driving the I channel input port; (iii) a quadrature mode in which both the I and Q channel input ports are driven with a selected positive phase difference; and (iv) an anti quadrature mode in which both the I and Q channel input ports are driven with a selected negative phase difference. A temporal sequence of the at least two coil modes may be determined and employed to compensate for B1 inhomogeneity.

    摘要翻译: 用于将射频驱动信号(70)与正交线圈(30)可操作地耦合的混合电路(40,40',40“)可配置成以下组中的至少两个线圈模式之一:(i)线性 I通道模式,其中驱动I通道输入端口(42)而不驱动Q通道输入端口(44); (ii)在不驱动I通道输入端口的情况下驱动Q通道输入端口的线性Q通道模式; (iii)正交模式,其中I和Q通道输入端口都以选择的正相位差驱动; 以及(iv)反正交模式,其中I和Q通道输入端口都以选定的负相位差驱动。 可以确定并采用至少两个线圈模式的时间序列来补偿B1不均匀性。

    Simultaneous MR-excitation of multiple nuclei with a single RF amplifier
    14.
    发明授权
    Simultaneous MR-excitation of multiple nuclei with a single RF amplifier 失效
    使用单个RF放大器同时MR激发多个核

    公开(公告)号:US07615997B2

    公开(公告)日:2009-11-10

    申请号:US12091303

    申请日:2006-10-03

    IPC分类号: G01V3/00

    CPC分类号: G01R33/3635

    摘要: A medical imaging system (2) excites multiple nuclei through a single RF amplifier (24). The medical imaging system (2) includes a magnet (10) that generates a main magnetic field (Bo) in an examination region. A gradient coil (14) superimposes magnetic field gradients (G) on the main magnetic field Bo. At least one transmitter (28) generates multi-nuclei excitation pulses associated with at least two different isotopes and two different frequency spectra. The single amplifier (24) sends the multi-nuclei excitation pulses to a RF coil (18, 20) for application to the examination region.

    摘要翻译: 医学成像系统(2)通过单个RF放大器(24)激发多个核。 医疗成像系统(2)包括在检查区域中产生主磁场(Bo)的磁体(10)。 梯度线圈(14)将磁场梯度(G)叠加在主磁场Bo上。 至少一个发射器(28)产生与至少两个不同同位素和两个不同频谱相关联的多核激励脉冲。 单个放大器(24)将多核激励脉冲发送到RF线圈(18,20)以供应用于检查区域。

    Specific energy absorption rate model
    16.
    发明授权
    Specific energy absorption rate model 失效
    比能量吸收率模型

    公开(公告)号:US07282914B2

    公开(公告)日:2007-10-16

    申请号:US10560870

    申请日:2004-06-30

    IPC分类号: G01V3/00

    摘要: An MRI apparatus is provided. The apparatus includes a main magnet for generating a main magnetic field in an examination region, a plurality of gradient coils for generating gradient fields within the main field, an RF transmit coil for transmitting RF signals into the examination region and exciting magnetic resonance in a subject disposed therein in accordance with a plurality of imaging parameters, the transmitted RF signals having a SAR associated therewith, and a SAR processor for maintaining the transmitted RF signals below a prescribed SAR level.

    摘要翻译: 提供MRI装置。 该装置包括用于在检查区域中产生主磁场的主磁体,用于在主场内产生梯度场的多个梯度线圈,用于将RF信号发送到检查区域中的激励磁共振的RF发射线圈 根据多个成像参数设置在其中,所发送的RF信号具有与其相关联的SAR,以及SAR处理器,用于将发射的RF信号保持在规定的SAR水平以下。