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首页> 外文期刊>ICES Journal of Marine Science >Modelling The Target Strength Of Trachurus Symmetricus Murphyi Based On High-resolution Swimbladder Morphometry Using An Mri Scanner
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Modelling The Target Strength Of Trachurus Symmetricus Murphyi Based On High-resolution Swimbladder Morphometry Using An Mri Scanner

机译：基于Mri扫描仪的高分辨率摆线形态学模型对墨chu鱼目标强度建模

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摘要

The acoustic target strength (TS) of Chilean jack mackerel (Trachurus symmetricus murphyi) was computed from three-dimensional reconstructions of the swimbladder form. The primary morphometric data were derived from high-resolution images made with a clinical whole-body 3-tesla magnetic resonance imaging (MRI) scanner. The fish were obtained from a commercial purse-seiner operating off Chile during 2003. Transverse MRI sequences of 18 fish were performed with a volumetric pixel 0.5 × 0.5 mm in cross section and 0.7 mm in the axial direction. From each transverse section, the swimbladder contour was traced manually using a digital pen tablet and smoothed using an automatic interpolation routine. The digital contours were used to build a triangular mesh spanning the swimbladder surface. The high-resolution swimbladder models revealed details such as undulations in the dorsal surface of the swimbladder caused by the backbone, and holes where the haemal spines penetrate the posterior end of the swimbladder. The Kirchhoff approximation was used to compute TS as a function of fish orientation at 38 kHz. The mean dorsal-aspect TS was computed for several orientation patterns and regressed on the logarithm of total fish length to derive operationally simple formulae.
机译：智利jack鱼（Trachurus symmetricus murphyi）的声学目标强度（TS）是根据泳囊形式的三维重建计算得出的。主要形态学数据来自使用临床全身3特斯拉磁共振成像（MRI）扫描仪拍摄的高分辨率图像。这条鱼是从2003年在智利附近经营的一家商业围网鱼中获得的。对18条鱼的横向MRI序列的横截面像素为0.5×0.5 mm，轴向像素为0.7 mm。从每个横切面上，使用数字数位板手动跟踪游泳囊轮廓，并使用自动插值例程对其进行平滑处理。数字轮廓用于构建跨越泳囊表面的三角形网格。高分辨率游泳囊模型揭示了细节，例如，脊柱在脊柱背表面起伏，以及脊椎穿刺后部的孔洞。使用基尔霍夫（Kirchhoff）近似值来计算作为38 kHz鱼类取向的函数的TS。计算了几种方位模式的平均背向TS，并以鱼总长的对数进行回归，得出操作简单的公式。

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