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22 条记录 (耗时 0.019 秒)

    Vibrotactile devices for controlled somato sensory stimulus during functionalmagnetic resonance imaging
    11.
    发明申请
    Vibrotactile devices for controlled somato sensory stimulus during functionalmagnetic resonance imaging 审中-公开
    在功能磁共振成像期间用于受控somato感觉刺激的振动触觉装置

    公开(公告)号：US20100030120A1

    公开(公告)日：2010-02-04

    申请号：US12588115

    申请日：2009-10-05

    申请人： Simon J. Graham ,  Donald B. Plewes ,  Wiliam E. McLlroy ,  W. Richard Staines

    发明人： Simon J. Graham ,  Donald B. Plewes ,  Wiliam E. McLlroy ,  W. Richard Staines

    IPC分类号： A61H1/00 ,  A61B5/05

    CPC分类号： G01R33/4806 ,  G01R33/28

    摘要： A functional magnetic resonance imaging (fMRI) compatible magnetomechanical vibrotactile device (MVD) uses wire coils having small oscillatory currents to interact with the large static magnetic field inherent to MRI scanners. The resulting Lorentz forces which are exerted on the MVD can be oriented to generate large vibrations that may be easily converted to translational motions as large as several centimetres. Representative data demonstrate the flexibility of MVDs to generate different well-controlled vibratory and tactile stimuli to activate special proprioceptive and cutaneous somatosensory afferent pathways.

    摘要翻译： 功能磁共振成像（fMRI）兼容磁力机电振动脉冲装置（MVD）使用具有小振荡电流的线圈与MRI扫描仪固有的大静态磁场相互作用。 施加在MVD上的所产生的洛伦兹力可以被定向以产生可能容易地转换成大至几厘米的平移运动的大的振动。 代表性数据表明MVDs产生不同的良好控制的振动和触觉刺激以激活特殊的本体感觉和皮肤体感传入通路的灵活性。

    Magnetic resonance imaging in an inhomogeneous magnetic field
    13.
    发明授权
    Magnetic resonance imaging in an inhomogeneous magnetic field 失效
    磁共振成像在非均匀磁场中

    公开(公告)号：US5309101A

    公开(公告)日：1994-05-03

    申请号：US1967

    申请日：1993-01-08

    申请人： Jae K. Kim ,  Donald B. Plewes ,  Ross M. Henkelman

    发明人： Jae K. Kim ,  Donald B. Plewes ,  Ross M. Henkelman

    IPC分类号： G01R33/565 ,  G01R33/20

    CPC分类号： G01R33/56563

    摘要： A method for MR imaging in an inhomogeneous magnetic field substantially without inhomogeneity induced artifacts is disclosed. The method includes acquiring more than one line of K-space per pulse sequence. The K-space data is acquired in partial line segments. The method allows shorter imaging times and higher image quality than conventional imaging methods for inhomogeneous fields.

    摘要翻译： 公开了一种基本上没有不均匀性引起的伪像的非均匀磁场中MR成像的方法。 该方法包括每脉冲序列获取多于一行的K空间。 K空间数据以部分线段获取。 该方法允许比非均匀场的传统成像方法更短的成像时间和更高的图像质量。

    Interleaved acquisition of multi-slice NMR data
    14.
    发明授权
    Interleaved acquisition of multi-slice NMR data 失效
    交叉采集多片NMR数据

    公开(公告)号：US5237273A

    公开(公告)日：1993-08-17

    申请号：US703989

    申请日：1991-05-22

    申请人： Donald B. Plewes ,  Jonathan E. Bishop

    发明人： Donald B. Plewes ,  Jonathan E. Bishop

    IPC分类号： G01R33/54

    CPC分类号： G01R33/4835

    摘要： A pulse sequence for a multi-slice T.sub.2 -weighted NMR scan acquires three NMR echo signals from three separate slices in a single TE time interval. The three separate slices are excited by a set of three selective RF excitation pulses followed by a set of three selective RF echo pulses. Three NMR echo signals are subsequently acquired in the presence of three successive readout gradient pulses.

    摘要翻译： 用于多切片T2加权NMR扫描的脉冲序列在单个TE时间间隔内从三个单独的切片获取三个NMR回波信号。 三个分离的切片被一组三个选择性RF激发脉冲激励，随后是一组三个选择性RF回波脉冲。 随后在存在三个连续的读出梯度脉冲的情况下获取三个NMR回波信号。

    Quality of shadowgraphic x-ray images
    19.
    发明授权
    Quality of shadowgraphic x-ray images 失效
    阴影x射线图像的质量

    公开(公告)号：US4773087A

    公开(公告)日：1988-09-20

    申请号：US851252

    申请日：1986-04-14

    申请人： Donald B. Plewes

    发明人： Donald B. Plewes

    IPC分类号： A61B6/06 ,  G21K1/02 ,  G21K1/04 ,  H05G1/36 ,  H05G1/44 ,  H05G1/60 ,  G21K5/10

    CPC分类号： A61B6/482 ,  A61B6/06 ,  A61B6/544 ,  G21K1/025 ,  G21K1/04 ,  G21K1/043 ,  H05G1/36 ,  H05G1/44 ,  H05G1/60 ,  A61B6/405 ,  A61B6/4291

    摘要： The quality of x-ray shadowgraphic images is improved by beam equalization controlled to ensure that just the right amount of radiation is used to accomplish the desired result, be it a desired image density and contrast or a desired signal-to-noise ratio or some other desired characteristic. The new techniques include: (1) maintaining a substantially constant signal-to-noise ratio throughout the image by measuring both scattered and primary radiation and using the results in a feedback loop to control the x-ray tube output, (2) raster scanning an x-ray beam along straight lines at constant velocity within a line by using a curved slit rotating aperture, (3) simultaneously controlling each of the intensity and hardness of a scanned x-ray beam as determined by post-patient x-ray measurements, and (4) using a segmented fan to scan the patient in a direction transverse to the plane of the fan and individually modulating each beam segment to achieve desired image characteristics.

    摘要翻译： x射线阴影图像的质量通过被控制的光束均衡来提高，以确保仅使用适量的辐射来实现期望的结果，无论是期望的图像密度和对比度还是期望的信噪比或一些 其他所需特性。 新技术包括：（1）通过测量散射和主辐射来维持整个图像的基本恒定的信噪比，并使用反馈回路中的结果来控制X射线管输出，（2）光栅扫描 通过使用弯曲的狭缝旋转孔，在线内以恒定速度沿着直线的X射线束，（3）同时控制扫描的X射线束的强度和硬度，如通过患者后X射线测量确定的 ，和（4）使用分段风扇沿横向于风扇平面的方向扫描患者，并单独调制每个束段以实现期望的图像特征。