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39 条记录 (耗时 0.022 秒)

    Monitoring body functions using fast NMR pulse sequences
    13.
    发明授权
    Monitoring body functions using fast NMR pulse sequences 失效
    使用快速NMR脉冲序列监测身体功能

    公开(公告)号：US5291891A

    公开(公告)日：1994-03-08

    申请号：US920351

    申请日：1992-07-27

    申请人： Thomas K. Foo ,  Matthew A. Bernstein

    发明人： Thomas K. Foo ,  Matthew A. Bernstein

    IPC分类号： G01R33/567 ,  A61B5/055

    CPC分类号： G01R33/5676

    摘要： T*.sub.2 contrast in images reconstructed from fast NMR pulse sequences is improved by increasing the gradient recalled echo time TE. The pulse repetition time TR is minimized to maintain high temporal resolution by asymmetrically acquiring the echo signal with its peak disposed bear the end of the acquisition window.

    摘要翻译： 通过增加梯度回波回波时间TE来提高从快速NMR脉冲序列重建的图像中的T * 2对比度。 脉冲重复时间TR被最小化以通过不对称地获取回波信号来保持高的时间分辨率，其峰值设置承载采集窗口的末端。

    Flow compensated NMR fast pulse sequence
    14.
    发明授权
    Flow compensated NMR fast pulse sequence 失效
    流量补偿NMR快速脉冲序列

    公开(公告)号：US4973906A

    公开(公告)日：1990-11-27

    申请号：US395001

    申请日：1989-08-17

    申请人： Matthew A. Bernstein

    发明人： Matthew A. Bernstein

    IPC分类号： A61B5/055 ,  G01R33/48 ,  G01R33/561 ,  G01R33/567

    CPC分类号： G01R33/561 ,  G01R33/5613 ,  G01R33/56509

    摘要： A steady-state free precession fast NMR pulse sequence includes a readout gradient waveform which refocuses the transverse magnetization to produce an S- NMR signal during the subsequent pulse sequence. This readout gradient waveform is shaped to null the gradient first moment and to thereby suppress flow and motion artifacts. In an alternative embodiment, crusher pulses employed in the phase encoding or slice select gradients are also flow compensated.

    Accelerated shells trajectory MRI acquisition
    15.
    发明授权
    Accelerated shells trajectory MRI acquisition 有权
    加速炮弹弹道MRI采集

    公开(公告)号：US08214013B2

    公开(公告)日：2012-07-03

    申请号：US12018899

    申请日：2008-01-24

    申请人： Yunhong Shu ,  Matthew A. Bernstein

    发明人： Yunhong Shu ,  Matthew A. Bernstein

    IPC分类号： A61B5/055

    CPC分类号： G01R33/561 ,  G01R33/4824 ,  G01R33/5635

    摘要： A method for prescribing a scan on an MRI system includes selecting a general pulse sequence to be used during a time-resolved imaging process of a subject using an MRI system. The method also includes setting a first set of scan parameters to more specifically prescribe the general pulse sequence and setting a second set of scan parameters using a formula that relates time resolution and spatial resolution resulting from the first set of scan parameters. The method then includes performing the time-resolved imaging process using the general pulse sequence, the first set of scan parameters, and the second set of scan parameters.

    摘要翻译： 用于在MRI系统上规定扫描的方法包括选择将在使用MRI系统的对象的时间分辨成像处理期间使用的一般脉冲序列。 该方法还包括设置第一组扫描参数以更具体地规定通用脉冲序列，并使用涉及由第一组扫描参数产生的时间分辨率和空间分辨率的公式来设置第二组扫描参数。 该方法然后包括使用通用脉冲序列，第一组扫描参数和第二组扫描参数执行时间分辨成像处理。

    Method for reducing image artifacts caused by patient motion during MR imaging
    17.
    发明授权
    Method for reducing image artifacts caused by patient motion during MR imaging 失效
    用于减少MR成像期间患者运动引起的图像伪像的方法

    公开(公告)号：US06288544B1

    公开(公告)日：2001-09-11

    申请号：US09552177

    申请日：2000-04-18

    申请人： Matthew A. Bernstein ,  Tsur Bernstein

    发明人： Matthew A. Bernstein ,  Tsur Bernstein

    IPC分类号： G01V300

    CPC分类号： G01R33/56308 ,  G01R33/4835 ,  G01R33/56509

    摘要： An MRI system acquires MRA data from two overlapping thin slabs using a 3DTOF pulse sequence. Motion artifacts are reduced by using a reverse centric phase encode order during the first thin slab acquisition and a centric phase encode order during the second thin slab acquisition. Patient movement is reduced by producing a uniform sound with gradient pulse sequences during the interval between thin slab acquisitions and during a preparation period prior to the first thin slab acquisition.

    摘要翻译： MRI系统使用3DTOF脉冲序列从两个重叠的薄板获取MRA数据。 在第一薄板采集期间使用反向中心相位编码顺序并在第二薄板采集期间以中心相位编码顺序减少运动伪影。 通过在薄板获得之间的间隔期间和在第一薄板获取之前的准备阶段期间产生具有梯度脉冲序列的均匀声音来减少患者运动。

    MRI reconstruction using partial echo and partial NEX data acquisitions
    18.
    发明授权
    MRI reconstruction using partial echo and partial NEX data acquisitions 失效
    使用部分回波和部分NEX数据采集进行MRI重建

    公开(公告)号：US6166545A

    公开(公告)日：2000-12-26

    申请号：US219129

    申请日：1998-12-22

    申请人： Jason A. Polzin ,  Matthew A. Bernstein ,  Thomas K. F. Foo

    发明人： Jason A. Polzin ,  Matthew A. Bernstein ,  Thomas K. F. Foo

    IPC分类号： G01R33/561 ,  G01V3/00

    CPC分类号： G01R33/561

    摘要： A system and method is disclosed to combine both a fractional echo (k.sub.x) and a fractional NEX (k.sub.y) to reduce acquisition times and echo times in MR imaging. The method uses both zero-filling and homodyne reconstruction to construct concurrent fractional NEX and fractional echo data in a single image while minimizing any blurring effects. The system includes acquiring partial MRI data in the k.sub.x direction and acquiring partial MRI data in the k.sub.y direction. Once a partial echo and a partial NEX are acquired, the missing data is first zero-filled in the k.sub.x direction and Fourier transformed to acquire a full x direction data set. Next, the data is synthesized in the k.sub.y direction using a homodyne reconstruction technique to acquire a full data set in the k.sub.y direction. The full x,y data set can then be used to reconstruct an MR image with reduced acquisition and echo times. In order to minimize the effects of blurring in the resulting MR image, it is preferable to acquire at least an 80% fractional echo and a 60% fractional NEX. The system can be extended to any number of desirable dimensions.

    摘要翻译： 公开了将分数回波（kx）和分数NEX（ky）组合以减少MR成像中的采集时间和回波时间的系统和方法。 该方法使用零填充和零差重建来构建单个图像中的并发分数NEX和分数回波数据，同时最小化任何模糊效果。 该系统包括以kx方向获取部分MRI数据并且获取ky方向上的部分MRI数据。 一旦获得了部分回波和部分NEX，则丢失的数据首先在kx方向上零填充，并进行傅里叶变换以获取全x方向数据集。 接下来，使用零差重建技术以ky方向合成数据，以获取ky方向上的完整数据集。 然后可以使用完整的x，y数据集来重建具有减少的采集和回波时间的MR图像。 为了最小化所得MR图像中模糊的影响，优选获得至少80％的分数回波和60％的分数NEX。 该系统可以扩展到任何数量的所需尺寸。