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Postmortem computed tomography findings in the thorax - Experimental evaluation.

Hideki Hyodoh1, Jyunya Shimizu1, Masumi Rokukawa1

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Postmortem CT (PMCT) reveals distinct lung changes and pleural fluid accumulation patterns based on cause of death. These findings aid in determining time since death in forensic investigations.

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Area of Science:

  • Forensic pathology
  • Radiology
  • Postmortem imaging

Background:

  • Determining the time since death is crucial in forensic investigations.
  • Understanding postmortem changes in the lungs can provide valuable temporal information.
  • Postmortem CT (PMCT) offers a non-invasive method to assess these changes.

Purpose of the Study:

  • To investigate the time-related course of lung changes using PMCT in experimental fatal models.
  • To analyze the development of lung hypostasis and pleural space fluid based on cause of death.

Main Methods:

  • Experimental fatal models were created in 24 rabbits across four groups: drowning, hypothermia, bag suffocation, and control (Potassium Chloride).
  • CT scans were performed over a postmortem time course until putrefaction.
  • Percent of aerated lung volume (%ALV) and pleural space fluid were measured and statistically analyzed.

Main Results:

  • Intra-group analysis showed distinct periods of statistically different %ALV across groups (e.g., 1-24h in drowning, 5-6h in hypothermia).
  • Inter-group comparison revealed increased %ALV in suffocation and decreased %ALV in drowning within 12 hours.
  • Pleural space fluid detection times varied significantly by cause of death, with hypothermia showing the latest detection at 95 hours.

Conclusions:

  • Lung hypostasis and pleural space fluid collection patterns are specific to the cause of death.
  • These PMCT-observed changes are time-dependent, offering insights into postmortem intervals.