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    • 2. 发明申请
    • Method and Apparatus for Tomographic Imaging of Absolute Optical Absorption Coefficient in Turbid Media Using Combined Photoacoustic and Diffusing Light Measurements
    • 用于使用组合光声和漫射光测量的混浊介质中绝对光吸收系数的断层摄影的方法和装置
    • US20100208965A1
    • 2010-08-19
    • US12668976
    • 2008-03-05
    • Huabei JiangZhen YuanQiang WangLu YinQizhi Zhang
    • Huabei JiangZhen YuanQiang WangLu YinQizhi Zhang
    • G06K9/00
    • A61B5/0073A61B5/0095A61B5/4528
    • Embodiments of the invention pertain to methods for imaging a light absorption coefficient distribution. Embodiments of the subject method can be implemented without knowing the strength of incident light in advance and without requiring careful calibrations in the non-scattering medium. Embodiments of the method can combine conventional photoacoustic tomography (PAT) with diffusing light measurements coupled with an optimization procedure based on the photon diffusion equation. Images of absorbing targets as small as 0.5 mm in diameter embedded in a 50 mm diameter background medium can be quantitatively recovered. Small targets with various optical contrast levels relative to the background can be detected well. Embodiments of the subject reconstruction method can include first obtaining the map of absorbed optical energy density. Embodiments can obtain the map of absorbed optical energy density through a model-based reconstruction algorithm that is based on a finite element solution to the photoacoustic wave equation in frequency domain subject to the radiation or absorbing boundary conditions (BCs). The distribution of optical fluence can then be obtained. Embodiments can obtain the distribution of optical fluence using the photon diffusion equation based optimization procedure. The distribution of optical absorption coefficient can then be recovered from the distribution of optical fluence and the absorbed energy density.
    • 本发明的实施例涉及用于对光吸收系数分布进行成像的方法。 可以在不知道入射光的强度并且不需要在非散射介质中仔细校准的情况下实现本方法的实施例。 该方法的实施例可以将传统的光声层析成像(PAT)与基于光子扩散方程的优化过程耦合的扩散光测量结合起来。 可以定量地回收直径为50mm的背景介质中直径小于0.5mm的吸收靶的图像。 可以很好地检测到具有相对于背景的各种光学对比度水平的小目标。 被摄体重建方法的实施例可以包括首先获得吸收的光能密度的图。 实施例可以通过基于模型的重建算法获得吸收的光能密度的图,该算法基于经受辐射或吸收边界条件(BC)的频域中的光声波方程的有限元解。 然后可以获得光能的分布。 实施例可以使用基于光子扩散方程的优化程序获得光能的分布。 光吸收系数的分布可以从光能的分布和吸收的能量密度中恢复。
    • 6. 发明授权
    • Particle analysis system and method
    • 粒子分析系统及方法
    • US07187441B1
    • 2007-03-06
    • US09297895
    • 1997-11-07
    • Eva Sevick-MuracaJoseph PierceSteven RichterRajesh ShindeGanesh BalgiJeffrey KaoHuabei Jiang
    • Eva Sevick-MuracaJoseph PierceSteven RichterRajesh ShindeGanesh BalgiJeffrey KaoHuabei Jiang
    • G01N21/51
    • G01N21/49G01N15/0205
    • A system (20) and method are disclosed for the self-calibrating, on-line determination of size distribution f(x) and volume fraction φ of a number of particles (P) dispersed in a medium (M) by detecting one or more propagation characteristics of multiply scattered light from the particles (P). The multiply scattered light is re-emitted in response to exposure to a light source (21) configured to provide light at selected wavelengths. The determination includes calculating the isotropic scattering and absorption coefficients for the particles (P) by comparing the incident and detected light to determine a measurement corresponding to the propagation time through the scattering medium (M), and iteratively estimating the size distribution f(x) and volume fraction φ as a function of the coefficients for each of the wavelengths. An estimation approach based on an expected form of the distribution and the mass of the particles is also disclosed. Furthermore, techniques to determine a particle structure factor indicative of particle-to-particle interactions which vary with particle concentration and influence light scattering at high concentrations is disclosed.
    • 公开了用于自动校准,在线确定分散在介质中的多个颗粒(P)的尺寸分布f(x)和体积分数phi的系统(20)和方法( M),通过检测来自颗粒(P)的多个散射光的一个或多个传播特性。 响应于暴露于被配置为提供所选波长的光的光源(21),多次散射光被重新发射。 确定包括通过比较入射光和检测光来计算颗粒(P)的各向同性散射和吸收系数,以确定对应于通过散射介质的传播时间的测量( M),并且迭代地 估计尺寸分布f(x)和体积分数phi作为每个波长的系数的函数。 还公开了基于颗粒的分布和质量的预期形式的估计方法。 此外,公开了确定指示随着粒子浓度变化并影响高浓度下的光散射的粒子与粒子相互作用的粒子结构因子的技术。
    • 7. 发明申请
    • ENHANCED IMAGE RECONSTRUCTION IN PHOTOACOUSTIC TOMOGRAPHY
    • 光电图像增强图像重构
    • US20140029829A1
    • 2014-01-30
    • US14009584
    • 2012-04-06
    • Huabei JiangLei Yao
    • Huabei JiangLei Yao
    • G06T7/00
    • G06T7/0012A61B5/0095A61B5/72A61B8/13A61B8/5207
    • Various embodiments of methods and systems are provided for image reconstruction in photoacoustic tomography. In one embodiment, among others, a method includes obtaining photoacoustic time-domain data; reconstructing an image from the photoacoustic time-domain data using total-variation m inimization based photoacoustic tomography reconstruction; and providing the reconstructed image for rendering on a display device. In another embodiment, a system includes a computing device and an image reconstruction program executable in the computing device. The image reconstruction program includes logic that obtains photoacoustic time-domain data; logic that reconstructs an image from the photoacoustic time-domain data using total-variation minimization based photoacoustic tomography reconstruction; and logic that provides the reconstructed image for rendering on a display device.
    • 方法和系统的各种实施例被提供用于光声层析成像中的图像重建。 在一个实施例中,其中包括获得光声时域数据的方法; 使用基于全变量的基于光声层析成像重建的光声时域数据重建图像; 以及提供用于在显示装置上呈现的重建图像。 在另一个实施例中,系统包括计算设备和可在计算设备中执行的图像重建程序。 图像重建程序包括获得光声时域数据的逻辑; 使用基于总变差最小化的光声层析成像重建从光声时域数据重建图像的逻辑; 以及提供用于在显示设备上呈现的重建图像的逻辑。