Artificial intelligence for human gunshot wound classification.

Journal: Journal of pathology informatics
Published Date: Dec 30, 2023

Abstract

Certain features are helpful in the identification of gunshot entrance and exit wounds, such as the presence of muzzle imprints, peripheral tears, stippling, bone beveling, and wound border irregularity. Some cases are less straightforward and wounds can thus pose challenges to an emergency room doctor or forensic pathologist. In recent years, deep learning has shown promise in various automated medical image classification tasks. This study explores the feasibility of using a deep learning model to classify entry and exit gunshot wounds in digital color images. A collection of 2418 images of entrance and exit gunshot wounds were procured. Of these, 2028 entrance and 1314 exit wounds were cropped, focusing on the area around each gunshot wound. A ConvNext Tiny deep learning model was trained using the Fastai deep learning library, with a train/validation split ratio of 70/30, until a maximum validation accuracy of 92.6% was achieved. An additional 415 entrance and 293 exit wound images were collected for the test (holdout) set. The model achieved an accuracy of 87.99%, precision of 83.99%, recall of 87.71%, and F1-score 85.81% on the holdout set. Correctly classified were 88.19% of entrance wounds and 87.71% of exit wounds. The results are comparable to what a forensic pathologist can achieve without other morphologic cues. This study represents one of the first applications of artificial intelligence to the field of forensic pathology. This work demonstrates that deep learning models can discern entrance and exit gunshot wounds in digital images with high accuracy.

Authors

  • Jerome Cheng
    Department of Pathology, University of Michigan, Ann Arbor, MI, USA.
  • Carl Schmidt
    Department of Pathology, University of Michigan, Ann Arbor, MI, USA.
  • Allecia Wilson
    Department of Pathology, University of Michigan, Ann Arbor, MI, USA.
  • Zixi Wang
    Biostatistics Department, School of Public Health, University of Michigan, Ann Arbor, MI, USA.
  • Wei Hao
    Biostatistics Department, School of Public Health, University of Michigan, Ann Arbor, MI, USA.
  • Joshua Pantanowitz
    Michigan Center for Translational Pathology, University of Michigan, Ann Arbor, MI, USA.
  • Catherine Morris
    Department of Pathology, University of Michigan, Ann Arbor, MI, USA.
  • Randy Tashjian
    Department of Pathology, University of Michigan, Ann Arbor, MI, USA.
  • Liron Pantanowitz
    Department of Pathology, University of Michigan, Ann Arbor, MI, USA.

Keywords

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