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为了实现单元探测器高质量的快速光声图像重建,提出了不同旋转扫描次数对光声层析成像的影响方案。实验采用的光源为YAG激光器,波长为1 064 nm,重复频率为20 Hz,脉宽为7 ns,探测器为针状的PVDF膜水听器,接收直径为1 mm,得到了26个字母、12根头发丝、树叶骨架和模拟血管的光声重建图像。由仿真和实验结果表明,在不牺牲光声重建图像质量的前提下,单元探测器环形扫描一圈,均匀采集100个位置的信号,图像重建时间为5.903 s。该研究结果对于单元探测器的快速旋转扫描成像和环形阵列探测器阵元数的设计具有一定的指导意义。 相似文献
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We investigate the influence of laser illumination on the magnetization in multiferroic YbFe2O4 single crystals. A photoinduced magnetization change is confirmed in both ab plane and the c-axis directions. The temperature dependence of the photoinduced magnetization reduction excludes laser heating as the cause. In terms of the breakdown of charge order driven by laser illumination, the photoinduced magnetization change provides strong evidence for the spin-charge coupling in YbFe2O4. This photomagnetic effect based on charge-order-induced multiferroicity could be used for the non-thermal optical control of magnetization. 相似文献
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The murine model of hindlimb ischemia is extensively used in studies on the physiology and pathology of ischemia and angiogenesis. Traditional non-invasive evaluation methods, such as laser or ultrasound blood flow perfusion imaging and micro-CT angiography, are limited either by low resolution or toxic exogenous agents. Relying on intrinsic high optical absorption contrast, we conduct label-free imaging of subcutaneous blood vasculature in the hindlimb of murine models by photoacoustic microscopy (PAM). The angiogenesis induced by ischemia in the hindlimb is successfully observed at high resolution in vivo and non-invasively. PAM is a potentially powerful imaging method for studying ischemic diseases and resultant angiogenesis. 相似文献
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