Postmortem computed tomography (PMCT) and autopsy in deadly gunshot wounds--a comparative study.

Area of Science:

• Forensic Radiology
• Forensic Pathology
• Medical Imaging

Background:

• Postmortem computed tomography (PMCT) is increasingly used in evaluating deaths.
• Gunshot-related deaths present unique challenges for forensic analysis.
• Comparison between PMCT and autopsy is crucial for validating forensic criteria.

Purpose of the Study:

• To compare the effectiveness of PMCT and autopsy in determining forensic pathology criteria in gunshot-related deaths.
• To evaluate the performance of different reader groups (radiologists and a mixed group) in interpreting PMCT data.
• To assess the accuracy of PMCT in identifying specific injury characteristics.

Main Methods:

• 51 cases of gunshot-related deaths were analyzed using PMCT.
• Two reader groups evaluated PMCT data for number of shots, localization, caliber, direction, and associated injuries.
• Findings were compared against the gold standard of physical autopsy.

Main Results:

• A good overall correlation was observed between PMCT reader groups and autopsy findings.
• Discrepancy rates were 23.4% for group I (two radiologists) and 15.6% for group II (radiologist and pathologist).
• PMCT excelled in locating fragmented bullets, while autopsy was superior for most gunshot injury localizations.

Conclusions:

• PMCT is advantageous for locating fragmented bullets and fragment clouds.
• Physical autopsy remains superior for localizing most gunshot injuries.
• Combining radiologist and pathologist expertise in PMCT interpretation may offer slight advantages, particularly for caliber assessment.