Investigation of opacity development in the human eye for estimation of the postmortem interval

Cantürk, İsmail; Çelik, Safa; Şahin, M. Feyzi; Yağmur, Fatih; Kara, Sadık; Karabiber, Fethullah

doi:10.1016/j.bbe.2017.02.001

Cited by 11 publications

(9 citation statements)

References 15 publications

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“…The degenerated endothelial barrier of the cornea cannot prevent the flow of aqueous humor to the cornea, which results in opacity. Other causes of postmortem corneal opacity reported in the scientific literature include architectural destruction of the collagen fiber network, functional alteration of corneal endothelial layer, dysregulation of proteoglycan hydration, and ion concentration in corneal stroma (18–20).…”

Section: Medical Backgroundmentioning

confidence: 99%

Post‐mortem Iris Decomposition and its Dynamics in Morgue Conditions

Trokielewicz

Czajka

Maciejewicz

2020

Journal of Forensic Sciences

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With increasing interest in employing iris biometrics as a forensic tool for identification by investigation authorities, there is a need for a thorough examination and understanding of postmortem decomposition processes that take place within the human eyeball, especially the iris. This can prove useful for fast and accurate matching of antemortem with postmortem data acquired at crime scenes or mass casualties, as well as for ensuring correct dispatching of bodies from the incident scene to a mortuary or funeral homes. Following these needs of forensic community, this paper offers an analysis of the coarse effects of eyeball decay done from a perspective of automatic iris recognition. We analyze postmortem iris images acquired for a subject with a very long postmortem observation time horizon (34 days), in both visible light and near‐infrared light (860 nm), as the latter wavelength is used in commercial iris recognition systems. Conclusions and suggestions are provided that may aid forensic examiners in successfully utilizing iris patterns in postmortem identification of deceased subjects. Initial guidelines regarding the imaging process, types of illumination, and resolution are also given, together with expectations with respect to the iris features decomposition rates. Visible iris features possible for human, expert‐based matching persists even up to 407 h postmortem, and near‐infrared illumination is suggested for better mitigation of corneal opacity while imaging cadaver eyes (Post‐mortem iris decomposition and its dynamics in morgue conditions. ArXiv pre‐print, 2019).

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Section: Medical Backgroundmentioning

confidence: 99%

Post‐mortem Iris Decomposition and its Dynamics in Morgue Conditions

Trokielewicz

Czajka

Maciejewicz

2020

Journal of Forensic Sciences

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“…It is very important for the investigation of death in civil and criminal cases to accurately infer the time of death, such as civil investigation of life insurance fraud, identifying the victim and suspect, and accepting or rejecting the suspect’s alibi ( 2 ). Traditional inference methods of PMI are usually based on corpse temperature ( 3 ) and early corpse phenomena such as livor mortis ( 4 ), rigor mortis ( 5 ), and post-mortem turbidity of cornea ( 6 ); it is difficult to precisely confirm the time since death, because these methods are rough, subjective, and empirical, as well as are greatly affected by environmental factors ( 7 ).…”

Section: Introductionmentioning

confidence: 99%

Combining with lab-on-chip technology and multi-organ fusion strategy to estimate post-mortem interval of rat

Zhang

Long

et al. 2023

Front. Med.

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BackgroundThe estimation of post-mortem interval (PMI) is one of the most important problems in forensic pathology all the time. Although many classical methods can be used to estimate time since death, accurate and rapid estimation of PMI is still a difficult task in forensic practice, so the estimation of PMI requires a faster, more accurate, and more convenient method.Materials and methodsIn this study, an experimental method, lab-on-chip, is used to analyze the characterizations of polypeptide fragments of the lung, liver, kidney, and skeletal muscle of rats at defined time points after death (0, 1, 2, 3, 5, 7, 9, 12, 15, 18, 21, 24, 27, and 30 days). Then, machine learning algorithms (base model: LR, SVM, RF, GBDT, and MLPC; ensemble model: stacking, soft voting, and soft-weighted voting) are applied to predict PMI with single organ. Multi-organ fusion strategy is designed to predict PMI based on multiple organs. Then, the ensemble pruning algorithm determines the best combination of multi-organ.ResultsThe kidney is the best single organ for predicting the time of death, and its internal and external accuracy is 0.808 and 0.714, respectively. Multi-organ fusion strategy dramatically improves the performance of PMI estimation, and its internal and external accuracy is 0.962 and 0.893, respectively. Finally, the best organ combination determined by the ensemble pruning algorithm is all organs, such as lung, liver, kidney, and skeletal muscle.ConclusionLab-on-chip is feasible to detect polypeptide fragments and multi-organ fusion is more accurate than single organ for PMI estimation.

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“…Electrical conductivity changes have been proposed in the literature in relation to PMI, stablishing a positive relationship between the time after death and electrical conductivity [8]. Postmortem eye changes might be an important means to determine the PMI, different studies have explored relationship between the elapsed time after death and the opacity development of the corneal and non-corneal regions [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Death as a Process: Early Postmortem Changes Observed in the Agonal Stage of Terminal Patients

Torrent¹,

Muñoz²,

Torroella³

et al. 2017

Insights Anthropol

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Introduction: Agony can be defined as the preciding stage to death, in those situations where life is gradually extinguished. So that, agony is characterized by the cese of the vital functions. From the moment of death and throughout the decomposition process, a series of observable postmortem changes occur in the corpse. Early postmortem changes are rigor mortis, livor mortis, algor mortis and cornea drying. Aim:The aim of the present observational study is to monitor the clinical signs presented during agony and to determine those that are considered as early postmortem changes.Material and methods: Signs monitoring and data registration were carried out during 4 months at the Intensive Care Unit of Hospital of Blanes (Girona, Spain), 21 patients were daily evaluated during their stay at the hospital until the moment of their death. The inclusión criteria for the individuals enrolled in the study were: i) Being diagnosed of a terminal disease and ii) Being at the end of life period. The evaluated signs were: Pallor and cianosis, body temperature, lividities, rigidity, apnea, oral secretions, anuria, eye dehydratation.Results: General pallor was registered in 14 patients, 5 patients presented cyanosis. 12 patients presented rigidity in the cervical region, 5 patients presented rigidity in upper extremity and 8 individuals presented rigidity in the lower extremity; Lividities in upper extremities could be observed in 5 patients, and 7 patients presented lividities in lower extremities. Eye dryness was observed in 10 patients. All those signs are considered postmortem changes. Conclusion:This article highlights the concept of death as a process. And it should be taken into account either by healthcare professionals dealing with the living, in their late stage of life, and also by forensic scientist dealing with the dead.

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Investigation of opacity development in the human eye for estimation of the postmortem interval

Cited by 11 publications

References 15 publications

Post‐mortem Iris Decomposition and its Dynamics in Morgue Conditions

Post‐mortem Iris Decomposition and its Dynamics in Morgue Conditions

Combining with lab-on-chip technology and multi-organ fusion strategy to estimate post-mortem interval of rat

Death as a Process: Early Postmortem Changes Observed in the Agonal Stage of Terminal Patients

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