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    • 8. 发明申请
    • DETERMINATION OF OPTICAL ABSORPTION COEFFICIENTS
    • 光学吸收系数的测定
    • WO2008038182A2
    • 2008-04-03
    • PCT/IB2007053763
    • 2007-09-18
    • KONINKL PHILIPS ELECTRONICS NVSAVERY DAVIDJANKOVIC LADISLAVANAND AJAY
    • SAVERY DAVIDJANKOVIC LADISLAVANAND AJAY
    • G01N29/24A61B5/00G01N21/17G01N21/47
    • G01N29/2418A61B5/0059A61B5/0095A61B8/08G01N21/1702G01N21/4795G01N2021/1706G01N2291/02466G01N2291/02475
    • The invention relates to an examination apparatus and a method for the determination of optical coefficients, particularly of the optical absorption coefficient (µa) in an object (1) like the body of a patient. The apparatus comprises an ultrasonic scanner (20) for recording first and second pulse echoes before and after the object (1) has been illuminated with a heating light beam (11) from a (e.g. laser) light source (10). An evaluation unit (30) determines a map of temperature increase (?T(r)) caused by the heating light beam (11) inside the object (1) based on apparent displacements showing up between the second and first pulse echoes. Furthermore, the evaluation of locally adjacent temperature increases inside the object (1) allows to determine a map of the effective scattering coefficient (µeff(r)), from which the distribution of light intensity (I(r)) inside the object (1) can be calculated. Finally, the desired optical absorption coefficient (µa) at a measuring location (r) can be determined from the light intensity and the temperature increase at this location.
    • 本发明涉及一种用于确定像患者身体的物体(1)中的光学系数,特别是光学吸收系数(μa)的检查装置和方法。 该装置包括用于在来自(例如激光)光源(10)的加热光束(11)照射物体(1)之前和之后记录第一和第二脉冲回波的超声波扫描器(20)。 评估单元(30)基于在第二和第一脉冲回波之间显示的表观位移来确定由对象(1)内部的加热光束(11)引起的温度升高(ΔT(r))的映射。 此外,物体(1)内的局部相邻温度升高的评估允许确定物体(1)内的光强度(I(r))的分布的有效散射系数(μeff(r))的映射 )可以计算。 最后,测量位置(r)所需的光学吸收系数(μa)可以从光强度和该位置的温度升高来确定。