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Error estimation on extracorporeal trajectory determination from body scans.

F Riva1,2,3, U Buck4,5, K Buße4

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Summary

Reconstructing bullet trajectories using post-mortem computed tomography (PMCT) involves errors from tissue deformation and image translation. This study quantifies these errors to improve accuracy in forensic investigations.

Keywords:
3D trajectory reconstructionBullet trajectoryComputer TomographyError estimationForensicShooting incident reconstruction

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Area of Science:

  • Forensic Science
  • Biomechanical Engineering
  • Medical Imaging

Background:

  • Post-mortem computed tomography (PMCT) is increasingly used in forensic investigations.
  • Accurate reconstruction of extracorporeal trajectories is crucial for crime scene analysis.
  • Existing methods may introduce errors due to body positioning and data translation.

Purpose of the Study:

  • To quantify the magnitude of errors in bullet trajectory reconstruction using PMCT data.
  • To investigate the impact of altered gravitational pull on soft tissue.
  • To assess errors introduced during the translation of scanned images into virtual body representations.

Main Methods:

  • Simulated virtual shooting trajectories with known vertical angles through five subjects.
  • Marking simulated wound positions on subjects in upright positions.
  • Scanning subjects in a supine position using 3D surface scanning.
  • Seven experts determined trajectories from virtual body representations.
  • Analysis of discrepancies between known and determined trajectories.

Main Results:

  • The study provides an estimation of the combined errors introduced by body repositioning and virtual model translation.
  • Quantified the impact of gravitational effects on soft tissue deformation in trajectory analysis.
  • Identified specific error ranges for trajectory reconstruction based on PMCT data.

Conclusions:

  • The findings offer insights into the reliability of PMCT for bullet trajectory reconstruction.
  • Results can aid in refining methodologies for analyzing shooting incidents.
  • Highlights the importance of considering positional changes and data translation in forensic ballistics.