Ruan H, Mather M L, Morgan S P
Electrical Systems and Optics Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK.
Appl Opt. 2013 Jul 1;52(19):4755-62. doi: 10.1364/AO.52.004755.
Ultrasound modulated optical tomography (USMOT) can image the optical properties of a scattering medium at a spatial resolution approaching that of ultrasound (US). A lock-in parallel speckle detection technique is proposed to detect pulsed US modulated light using a multipixel detector. The frequency components of the pass band match those of the US pulse train and provide efficient detection. The modulation depth is extracted by taking the difference between a pair of speckle patterns modulated by a pair of phase-inversed US bursts. Modification to pulse inversion mode enables the second harmonic US modulation due to nonlinear US propagation to be detected.
超声调制光学层析成像（USMOT）能够以接近超声（US）的空间分辨率对散射介质的光学特性进行成像。本文提出一种锁相平行散斑检测技术，用于使用多像素探测器检测脉冲超声调制光。通带的频率成分与超声脉冲序列的频率成分相匹配，从而实现高效检测。通过获取由一对相位相反的超声脉冲调制的一对散斑图案之间的差异来提取调制深度。对脉冲反转模式进行修改后，能够检测由于非线性超声传播而产生的二次谐波超声调制。
