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Quantification of Perspective-Induced Shape Change of Clavicles at Radiography and 3D Scanning to Assist Human Identification

Authors

  • Carl N. Stephan Ph.D.,

    Corresponding author
    1. Joint POW/MIA Accounting Command, Central Identification Laboratory, Hickam Air Force Base, HI
    2. School of Biomedical Sciences, The University of Queensland, Brisbane, Australia
    • Additional information and reprint requests:

      Carl N. Stephan, Ph.D.

      School of Biomedical Sciences

      The University of Queensland

      St Lucia, Qld 4072

      Australia

      E-mail: c.stephan@uq.edu.au.

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  • Pierre Guyomarc'h Ph.D.

    1. Joint POW/MIA Accounting Command, Central Identification Laboratory, Hickam Air Force Base, HI
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  • Presented in part at the 22nd Congress of the International Academy of Legal Medicine, Istanbul, Turkey, 2012. Supported, in part, by two appointments to the Postgraduate Research Participation Program at the Joint POW/MIA Accounting Command-Central Identification Laboratory, administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the U.S. Department of Energy and the JPAC-CIL. The views and opinions contained herein are solely those of the authors and are not to be construed as official, or as views of the U.S. Department of Defense and/or any of the U.S. Armed Forces.

Abstract

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.

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