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Identification score for robust and secure identification using ante- and post-mortem skull CT scans.

Marie-Edith Richard1,2, Corentin Provost1,2, Tania Delabarde3,4,5

  • 1Institute of Psychiatry and Neuroscience of Paris (IPNP), Université Paris Cité, INSERM U1266, 75014, Paris, France.

International Journal of Legal Medicine
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Summary

A new IDScore method uses computed tomography (CT) slices for subject identification, overcoming data security issues with ante-mortem CT (AMCT) images. This approach achieves 100% sensitivity and specificity for identifying individuals.

Keywords:
Computed tomographyForensic radiologyHuman identificationSinus

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Area of Science:

  • Forensic Radiology
  • Medical Imaging Analysis
  • Human Identification

Background:

  • Paranasal sinuses offer unique anatomical features for comparative identification between post-mortem CT (PMCT) and ante-mortem CT (AMCT).
  • Data security concerns impede the transfer of raw AMCT images for identity verification.

Purpose of the Study:

  • To develop and validate an identification score (IDScore) using CT slices for subject identification.
  • To address ethical and regulatory challenges associated with accessing AMCT data.

Main Methods:

  • Derivation of IDScore involved 98 patients with two AMCTs ≥1 year apart, with radiologists assessing slice similarity (ethmoid, frontal sinus, Left Semi-Circular Canal).
  • Validation used 27 PMCTs with comparative AMCTs, involving 5 comparison procedures per PMCT (1 concordant, 4 discordant).
  • Two radiologists scored ethmoid and frontal CT slice similarity (-2 to +2), with IDScore as the average sum.

Main Results:

  • IDScore demonstrated perfect discrimination between identical subjects with 100% sensitivity and 100% specificity.
  • Predetermined thresholds for IDScore ( > +2 for positive, < -1 for negative identification) were effective.
  • The study involved 135 comparison procedures in total.

Conclusions:

  • IDScore enables remote subject identification without needing complete raw AMCT images.
  • This method effectively bypasses ethical and regulatory hurdles in accessing AMCT data for identification.
  • IDScore offers a secure and efficient solution for forensic identification using CT imaging.