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Detection of underwater bubbles is one of the key issues of the research of ocean-atmosphere flux exchange. Digital holographic experiment is carried out based on Maeh-Zehnder digital holographic system, to detect the distribution of bubbles. Holographic images of the dynamical bubble fields are recorded by the chargecoupled device (CCD) video system and the tomographie images at different depth are reproduced. The distribution of sizes and densities of the bubbles is obtained through following steps as denoising, edgedetection, and bubble-recognition using Hough transform. Through the experiments, the efficiency and applicability of the digital holographic detection of underwater bubble fields are tested and verified. 相似文献
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99mTcN核标记的新型心肌灌注显像剂的研究 总被引:1,自引:0,他引:1
通过配体交换反应制备了[99mTcN(PNP5)(DEDC)]+和[99mTcN(PNP5)(DPODC)]+两种新配合物, 其放化纯度均大于90%. 生物性能研究结果表明: 两种配合物在小鼠心肌中的初始摄取高, 肝、肺等非靶组织清除快, 靶/非靶比高, 有利于早期心肌显像. 其中, [99mTcN(PNP5)(DEDC)]+在小鼠中的性质较优, 且其在狗体内的性质接近99mTc-tetrofosmin, 有望成为一种新型心肌灌注显像剂. 相似文献
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