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Related Experiment Video

Updated: May 5, 2026

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Estimation of postmortem time based on aorta narrowing in CT imaging.

Noboru Ishikawa1, Atsushi Nishida, Daisuke Miyamori

  • 1Department of Forensic Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 602-8566 Kyoto, Japan.

Journal of Forensic and Legal Medicine
|November 19, 2013
PubMed
Summary

Postmortem computed tomography (CT) can estimate time after death by analyzing abdominal aorta narrowing. This aorta narrowing, measured by a flatness ratio, increases significantly with postmortem interval.

Keywords:
Aorta narrowingCT imagingPostmortem time

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Area of Science:

  • Forensic Medicine
  • Radiology
  • Postmortem Imaging

Background:

  • Computed tomography (CT) is a valuable tool in forensic medicine, primarily for determining the cause of death.
  • The potential of CT imaging to provide information beyond the cause of death, such as the time since death, is an area of ongoing research.

Purpose of the Study:

  • To investigate the relationship between abdominal aorta narrowing and the postmortem interval using CT imaging.
  • To determine if CT-derived measurements of aorta narrowing can serve as a reliable indicator for estimating time after death.

Main Methods:

  • Examined the abdominal aorta narrowing in 140 forensic autopsy cases using computed tomography (CT).
  • Quantified aorta narrowing using a 'flatness ratio' (shorter axis divided by longer axis) below the diaphragm.
  • Correlated the flatness ratio with time after death, categorized into six distinct postmortem periods. Further validated findings in 15 cases with serial CT scans.

Main Results:

  • A significant, gradual decrease in the aorta flatness ratio was observed as the postmortem time increased.
  • This indicates a progressive narrowing of the abdominal aorta with a longer postmortem interval.
  • Serial CT imaging in 15 cases corroborated the findings of increasing aorta narrowing over time.

Conclusions:

  • Abdominal aorta narrowing, as visualized and quantified by postmortem CT, shows a strong correlation with the time elapsed since death.
  • This CT-based measurement offers a potential new method for estimating the postmortem interval in forensic investigations.