2019年第46卷第6期目录
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封面故事:曾亚光等提出一种高动态光学血管造影成像方法来实现活体生物样本血管造影成像. 该方法通过设置高动态范围曝光时间,依据于动态积分效应和吸收效应以实现高动态积分时间调制. 在实验过程中,采用高动态的曝光时间设置,以此获得不同曝光时间下的活体样品血流造影图像. 在低曝光条件下,调制深度几乎不受血流速度抑制,但接收到的散射光强信号弱,因此较薄的组织区域的血管能够高质量成像,且大血管在此时成像的信噪比较高. 在高曝光条件下,调制深度随血流速度的增加而增加,积分信号强度增强,因此较厚或者密度较大的组织区域血管能够高质量成像,且血红细胞浓度较低的小血管在此时成像信噪比较高. 通过该方法,能够同时获得各级血管清晰的造影图像,能消除样品厚度不均、吸收系数不同对成像造成的影响. 在实际应用中,同时获取非均匀活体实验样品的各级血管分布将有利于进行全局性的血液循环研究及相关研究.
(曾亚光,罗佳雄,韩定安,熊红莲,王雪花,钟俊平,王茗祎. 高动态光学血管造影成像,本期第612~619页)
Cover Story:We propose a high-dynamic optical angiography(HDOA) method to obtain blood flow images of a small biological specimen in vivo. High dynamic range exposure time is set to achieve high-dynamic integrated time modulation, which involves dynamic integrated effect and absorption effect. With this method, each-level vessels can be imaged with similar clarity. Moreover, the vessels in locations with different thickness and absorption coefficient can be reconstructed in the same image. Experiments on phantom and in vivo Gold Pristella Tetra were performed to demonstrate that HDOA can achieve each-level vessels imaging based on dynamic integrated effect and absorption effect.
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综述与专论
研究快报
研究报告
技术与方法
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