Ultrasound shear-wave elastography applicability in estimation of post-mortem time

Author:

Mosadegh Mohsen1,Khazaei Mehdi1,Abdollahpour Zohreh D2,Alahyari Sam3,Moharamzad Yashar1,Emamhadi Mohammadali4,Aram Samira5,Abolbaghaei Mojtaba5,Sanei Taheri Morteza1ORCID

Affiliation:

1. Radiology Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran

2. Clinical Applications Department, TANASA TEB NOVIN Co, Tehran, Iran

3. Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran

4. Forensic Medicine Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran

5. Legal Medicine Research Center, Legal Medicine Organization, Tehran, Iran

Abstract

Introduction Post-mortem rigidity of the tissues is one of the basic principles in forensic medicine to estimate the time of death. Qualitative methods to determine the stiffness of the corpse may have some limitations. Methods that provide quantitative values may be useful. We intended to evaluate the applicability of ultrasound shear-wave elastography of the tissues to estimate the post-mortem interval (PMI). Methods For 80 corpses, shear-wave elastography of the liver, sartorius muscle, testis, thyroid and parotid was performed before autopsy. Based on the forensic reports as the reference method to define post-mortem interval, the corpses were divided into four groups: group 0 (PMI < 24 hours), group 1 (PMI ≥24 hours and <48 hours), group 2 (PMI ≥ 48 hours and <72 hours), and group 3 (PMI ≥ 72 hours). There were 24, 38, 13, and 5 corpses, respectively, in groups 0, 1, 2, and 3. Results A significant rise in the elasticity values in comparison to elasticity of normal tissues in live adults was seen very early in the post-mortem period. Between-group comparisons showed that a significant difference in the liver elasticity was present among the groups. The mean (SD) liver elasticity was 10.29 (±0.83) in group 0, 14.98 (±1.56) in group 1, 12.49 (±1.09) in group 2, and 15.64 (±1.68) kilopascals (kPa) in group 3 ( P = 0.035). Nevertheless, elasticity measurements in other tissues were not helpful in distinguishing post-mortem interval groups. Conclusion It is possible to use liver quantitative shear-wave elastography to estimate the time of death.

Publisher

SAGE Publications

Subject

Radiology Nuclear Medicine and imaging,Radiological and Ultrasound Technology

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