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    • 74. 发明授权
    • Imaging systems and methods to improve backscattering imaging using circular polarization memory
    • 使用圆偏振记忆体改进反向散射成像的成像系统和方法
    • US07515265B2
    • 2009-04-07
    • US11414738
    • 2006-04-27
    • Robert R. AlfanoXiaohui Ni
    • Robert R. AlfanoXiaohui Ni
    • G01J4/00G01N33/48
    • G01N21/21A61B5/0066A61B5/02007A61B5/6852G01N21/4795G01N2021/216
    • An optical technique to improve the imaging of a target inside suspensions of scattering particles includes the illumination of the scattering particles with circularly polarized light. The backscattered light from the host medium preserves the helicity of incident light, while the backscattered light reflected from the target is predominated with light of opposite helicity. Based on the observed helicity difference in the emerging light that originated at the target and that backscattered from the medium, the present optical technique improves the image contrast using circular polarization. This approach makes use of polarization memory which leads to the reflected light from the target accompanied by weak diffusive backscattered light. Using the present technique, improved imaging of the artery wall is achieved and plaque composition can be assessed through a blood field associated with the artery. The scattering from the particles, such as red blood cells, in the blood is reduced due to polarization memory. The present invention can be also applied to other biomedical application, as well as image targets through adverse environmental conditions, such as fog, clouds, smoke, murky water, etc.
    • 用于改善散射颗粒悬浮液内的靶的成像的光学技术包括用圆偏振光照射散射颗粒。 来自主介质的反向散射光保留入射光的螺旋度,而从目标反射的背散射光以相反的螺旋度的光占优势。 基于在目标出现的光中观察到的螺旋度差异和从介质反向散射的现有光学技术使用圆偏振改善了图像对比度。 这种方法利用偏振存储器,其导致来自目标的反射光伴随着弱漫反射散射光。 使用本技术,实现了动脉壁的改进的成像,并且可以通过与动脉相关联的血液来评估斑块组成。 由于极化记忆,血液中的颗粒如红细胞的散射减少。 本发明还可以应用于其他生物医学应用,以及通过不利的环境条件(如雾,云,烟雾,阴暗水等)的图像目标。
    • 78. 发明授权
    • Performing selected optical measurements with optical coherence domain reflectometry
    • 用光学相干域反射测量法进行选择的光学测量
    • US06437867B2
    • 2002-08-20
    • US09772340
    • 2001-01-29
    • Iosif ZeylikovichRobert R. Alfano
    • Iosif ZeylikovichRobert R. Alfano
    • G01B902
    • A61B5/4872A61B5/0059A61B5/0066A61B5/0068A61B5/0073A61B5/0084G01B9/02007G01B9/02014G01B9/0209G01B9/02091G01B11/00G01B11/06G01B11/303G01N21/4795
    • A system and method for performing selected optical measurements on a sample is provided utilizing an optical coherence domain reflectometer which includes a diffraction grating. A broad band light source produces light having a short coherence length. A beamsplitter splits the light into a signal beam and a reference beam. A reference mirror is disposed to receive the reference beam. A lens brings the signal beam to focus on the sample. A diffraction grating receives reflections from the sample and from the reference mirror, the reflections being incident on the diffraction grating with respect to said diffraction grating normal such that a positive diffraction order from one of the reflections and a negative diffraction order from the other one of the reflections and a negative diffraction order from the other one of the reflections propagate along a common path. A lens collects the diffracted order from the diffraction grating directed along the common path and brings the diffracted orders to focus on a detector, the detector producing an output of said positive and negative diffracted orders received. A computer processes the output from the detector. In other versions of the invention, reflections from the sample are not directed onto the diffraction grating but instead are combined with a diffracted order from reflections from the reference mirror.
    • 使用包括衍射光栅的光学相干域反射计提供用于对样本进行选择的光学测量的系统和方法。 宽带光源产生具有短相干长度的光。 分束器将光分解成信号光束和参考光束。 配置参考镜以接收参考光束。 透镜使信号光束聚焦在样品上。 衍射光栅从样品和参考反射镜接收反射,反射相对于所述衍射光栅法线入射在衍射光栅上,使得来自反射之一的正衍射级和来自另一个的反射衍射级 来自另一个反射的反射和负衍射级沿着公共路径传播。 透镜从沿着公共路径引导的衍射光栅收集衍射顺序,并将衍射次序聚焦在检测器上,检测器产生接收到的所述正和负衍射级的输出。 计算机处理来自检测器的输出。 在本发明的其他形式中,来自样品的反射不指向衍射光栅,而是与来自参考反射镜的反射的衍射顺序组合。
    • 79. 发明授权
    • Microscope imaging inside highly scattering media
    • 高分散介质下的显微镜成像
    • US06215587B1
    • 2001-04-10
    • US08659615
    • 1996-06-06
    • Robert R. AlfanoGordon E. AndersonFeng Liu
    • Robert R. AlfanoGordon E. AndersonFeng Liu
    • G02B2100
    • G02B21/0072G02B21/00G02B21/0084G02B21/06
    • A method and system for imaging a small object in or behind a highly scattering medium comprises a laser source for illuminating the object with an ultrashort collimated beam of light and a novel microscope for forming a magnified image of the object using light emergent from the highly scattering medium, the emergent light consisting of a scattered component and a non-scattered component. The novel microscope comprises an objective, an eyepiece and an aperture centered at the back focal plane of the objective. The aperture, which may be of a fixed or variable size and controlled electronically or by a computer serves to spatially filter the scattered light component of the light emergent from the highly scattering medium. The system may also comprise a streak camera or similar time resolving device positioned at the image plane of the microscope for temporally filtering the scattered light component of the light emergent from the highly scattering medium.
    • 用于对高散射介质中或其后面的小物体进行成像的方法和系统包括用于以超短准直光束照射物体的激光源和用于使用来自高散射的光的光形成物体的放大图像的新型显微镜 介质,由散射组分和非分散组分组成的出射光。 该新型显微镜包括物镜,目镜和以物镜的后焦平面为中心的光圈。 可以具有固定或可变尺寸并且由电子控制或通过计算机控制的孔用于空间地过滤来自高度散射介质的出射光的散射光分量。 系统还可以包括位于显微镜的图像平面上的条纹相机或类似的时间分辨装置,用于对来自高度散射介质的出射光的散射光分量进行时间过滤。
    • 80. 发明授权
    • Time-resolved diffusion tomographic 2D and 3D imaging in highly
scattering turbid media
    • 在高散射混浊介质中的时间分辨扩散断层扫描2D和3D成像
    • US6108576A
    • 2000-08-22
    • US797163
    • 1997-02-10
    • Robert R. AlfanoWei CaiSwapan K. Gayen
    • Robert R. AlfanoWei CaiSwapan K. Gayen
    • A61B5/00G01N21/47A61B6/00
    • A61B5/0073A61B5/7257G01N21/4795A61B5/0091
    • A method for imaging objects in highly scattering turbid media. According to one embodiment of the invention, the method involves using a plurality of intersecting source/detectors sets and time-resolving equipment to generate a plurality of time-resolved intensity curves for the diffusive component of light emergent from the medium. For each of the curves, the intensities at a plurality of times are then inputted into the following inverse reconstruction algorithm to form an image of the medium: wherein W is a matrix relating output at source and detector positions r.sub.s and r.sub.d, at time t, to position r, .LAMBDA. is a regularization matrix, chosen for convenience to be diagonal, but selected in a way related to the ratio of the noise, to fluctuations in the absorption (or diffusion) X.sub.j that we are trying to determine:.LAMBDA..sub.ij =.lambda..sub.j .delta..sub.ij with .lambda..sub.j = / Y is the data collected at the detectors, and X.sup.k is the kth iterate toward the desired absorption information. An algorithm, which combines a two dimensional (2D) matrix inversion with a one-dimensional (1D) Fourier transform inversion is used to obtain images of three dimensional hidden objects in turbid scattering media.
    • 一种用于在高散射混浊介质中成像物体的方法。 根据本发明的一个实施例,该方法包括使用多个相交的源/检测器组和时间分辨设备来产生用于从介质出射的光的漫射分量的多个时间分辨强度曲线。 对于每个曲线,多个时间的强度然后被输入到以下逆重建算法中以形成介质的图像:其中W是在时间t处将源的输出和检测器位置rs和rd相关联的矩阵, 为了定位r,LAMBDA是一个正则化矩阵,为方便起见选择为对角线,但以与噪声的比值与我们试图确定的吸收(或扩散)Xj的波动相关的方式进行选择: LAMBDA ij = lambda j delta ij,其中λj = / Y是在检测器处收集的数据,Xk是朝向期望的吸收信息的第k次迭代。 将二维(2D)矩阵求逆与一维(1D)傅里叶变换反演相结合的算法用于获取浑浊散射介质中三维隐藏物体的图像。