Imaging Coral II: Using Ultrasound to Image Coral Skeleton
Imaging Coral II: Using Ultrasound to Image Coral Skeleton
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珊瑚成像 II：使用超声波对珊瑚骨骼进行成像
DOI：
10.1023/b:ssta.0000018446.38711.67
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
T. Szabo
中科院分区：
文献类型：
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作者：
R. Cleveland;A. Cohen;Ronald A. Roy;Hanumant Singh;T. Szabo
我们报告使用脉冲回波超声成像珊瑚骨骼密度。聚焦超声换能器的频率范围从1到5兆赫被用来成像珊瑚骨骼样本。每个传感器都在珊瑚表面扫描，并记录珊瑚反射的信号。超声波信号的后处理被用来生成珊瑚的声阻抗的图像-一个与珊瑚的密度相关的量。超声图像与珊瑚样品的X射线图像定性一致，X射线吸收也与珊瑚密度有关。两幅图像都显示了与珊瑚的年生长周期有关的带状结构。结果表明，超声可以用于珊瑚骨骼结构的无损成像。最终目标是建立一个原位系统，用于定量测量水下活珊瑚的骨骼密度。几种大型珊瑚礁珊瑚的骨骼密度与海洋温度密切相关。对长寿标本骨骼密度的时间序列重建将提供几个世纪以来海洋表面温度的历史，远远超过现有的仪器记录。
We report on imaging of coral skeletal densities using pulse-echo ultrasound. Focused ultrasound transducers with frequencies ranging from 1 to 5 MHz were used to image coral skeletal samples. Each transducer was scanned over the surface of a coral and the reflected signal from the coral was recorded. Post-processing of the ultrasound signal was used to generate images of the acoustic impedance of the coral—a quantity that is related to the density of the coral. The ultrasound images were qualitatively consistent with X-ray images of the coral samples—X-ray absorption is also related to coral density. Both images showed a banding structure related to the annual growth cycle of the coral. The results indicate that ultrasound can be used for nondestructive imaging of coral skeletal structure. The ultimate goal would be an in situ system for quantitatively measuring skeletal densities of live corals underwater. The skeletal density of several massive reef coral species is strongly correlated with ocean temperature. A time series reconstructions of the skeletal density of long lived specimens would provide a history of surface ocean temperatures over time periods extending over several centuries, far beyond the available instrumental record.