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Early Postmortem Interval Estimation in Forensic Radiology: A Proof-of-Concept Study Using qMRMI and Tractography in

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Estimating early postmortem interval (PMI) is challenging. This study introduces quantitative magnetic resonance molecular imaging (qMRMI) as a novel tool for early PMI estimation, showing promising results in a pig heart model.

Keywords:
Forensic radiology; postmortem protein degradation; pig heart; qMRMI; PMI estimation; postmortem imaging; PMMR

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Area of Science:

  • Forensic Science
  • Radiology
  • Biomedical Imaging

Background:

  • Estimating postmortem interval (PMI) is crucial in forensic science but often limited by current methods.
  • Advancements in radiological techniques offer potential solutions for improving PMI determination.
  • Early postmortem interval (ePMI) estimation remains a significant challenge in forensic investigations.

Purpose of the Study:

  • To propose and evaluate a novel approach for ePMI estimation using quantitative magnetic resonance molecular imaging (qMRMI).
  • To assess the feasibility of using qMRMI to detect postmortem degradation changes in cardiac tissue.
  • To explore the potential of qMRMI as a tool for early postmortem interval determination.

Main Methods:

  • Utilized a pig heart, chosen for its anatomical similarity to human hearts.
  • Performed magnetic resonance imaging (MRI) scans at two time points: 3.5 hours (T0) and 24 hours (T1) postmortem.
  • Monitored changes in Fractional Anisotropy (FA), tractography, and susceptibility weighted imaging related to heart degradation.

Main Results:

  • Observed time-dependent variations in MRI parameters, including decreasing FA and AD, and increasing ADC and RD.
  • These changes correlate with the progressive disorganization of myocyte architecture postmortem.
  • Demonstrated measurable degradation processes using qMRMI between 3.5 and 24 hours after death.

Conclusions:

  • Postmortem qMRMI shows potential as a powerful tool for early postmortem interval estimation.
  • Preliminary findings suggest qMRMI can detect significant postmortem cardiac tissue changes.
  • Further research with larger sample sizes and more time points is necessary to validate these results.