Stephan Carl N, Guyomarc'h Pierre
Joint POW/MIA Accounting Command, Central Identification Laboratory, 310 Worchester Avenue, Building 45, Hickam Air Force Base, HI, 96853; School of Biomedical Sciences, The University of Queensland, Brisbane, 4072, Australia.
J Forensic Sci. 2014 Mar;59(2):447-53. doi: 10.1111/1556-4029.12325. Epub 2013 Dec 6.
Change in perspective between antemortem and postmortem imaging sessions (radiograph to radiograph and surface scan to radiograph) may cause different 2D renderings of the same osseous element complicating comparisons for identification. In this study, clavicle shape changes due to radiographic positioning and 3D laser scanning were examined in 20 right-side specimens, as pertinent to chest radiograph comparisons. Results indicate substantial changes in clavicle form with short source-to-image receptor distance, elevation of the element from the image receptor, and movement of the element away from the center beam (10% mean square for shape). Although quantitative shape differences were small when the clavicle was in close opposition to the image receptor (3% mean square), important qualitative differences remained with large distances from the center beam (e.g., conoid tubercle presence/absence). The significance of these results for image superimposition and computer-automated-shape-based searches of radiographic libraries to find matching candidates is discussed.
生前和死后成像检查之间视角的变化（从X光片到X光片以及从表面扫描到X光片）可能会导致同一骨性结构呈现出不同的二维图像，从而使识别对比变得复杂。在本研究中，针对20个右侧标本，研究了与胸部X光片对比相关的因X光摄影定位和三维激光扫描导致的锁骨形状变化。结果表明，当源到图像接收器的距离较短、锁骨离图像接收器抬高以及锁骨远离中心射线时，锁骨形态会发生显著变化（形状的均方根为10%）。虽然当锁骨紧邻图像接收器时，定量的形状差异较小（均方根为3%），但当与中心射线距离较大时，仍存在重要的定性差异（例如，锥状结节的有无）。本文讨论了这些结果对于图像叠加以及基于形状的计算机自动搜索X光片库以寻找匹配候选图像的意义。
