1
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Kolpan KE, Vadala J, Dhanaliwala A, Chao T. Utilizing augmented reality for reconstruction of fractured, fragmented and damaged craniofacial remains in forensic anthropology. Forensic Sci Int 2024; 357:111995. [PMID: 38513528 DOI: 10.1016/j.forsciint.2024.111995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 02/26/2024] [Accepted: 03/17/2024] [Indexed: 03/23/2024]
Abstract
Forensic anthropologists are often confronted with human remains that have been damaged due to trauma, fire, or postmortem taphonomic alteration, frequently resulting in the fracture and fragmentation of skeletal elements. The augmented reality (AR) technology introduced in this paper builds on familiar 3D visualization methods and utilizes them to make three dimensional holographic meshes of skeletal fragments that can be manipulated, tagged, and examined by the user. Here, CT scans, neural radiance fields (NeRF) artificial intelligence software, and Unreal Engine production software are utilized to construct a three-dimensional holographic image that can be manipulated with HoloLens™ technology to analyze the fracture margin and reconstruct craniofacial elements without causing damage to fragile remains via excessive handling. This allows forensic anthropologists a means of assessing aspects of the biological profile and traumatic injuries without risking further damage to the skeleton. It can also be utilized by students and professional anthropologists to practice refitting before reconstructing craniofacial fragments if refitting is necessary. Additionally, the holographic images can be used to explain complicated concepts in a courtroom without the emotional response related to using bony elements as courtroom exhibits.
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Affiliation(s)
- Katharine E Kolpan
- Department of Culture, Society and Justice, University of Idaho, 875 Perimeter Drive, Moscow, ID 83844, USA.
| | - Jeffrey Vadala
- Penn Neurology Virtual Reality Laboratory, University of Pennsylvania, Richards Medical Laboratories, 3700 Hamilton Walk, Philadelphia, PA 19104, USA
| | - Ali Dhanaliwala
- Department of Radiology, Penn Presbyterian Medical Center, 51 N. 39th Street, Philadelphia, PA 19104, USA
| | - Tiffany Chao
- Department of Otorhinolaryngology - Head and Neck Surgery, Penn Presbyterian Medical Center, 51 N. 39th Street, Philadelphia, PA 19104, USA
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2
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Henningsen MJ, Thorlacius-Ussing L, Jensen LG, Hansen K, Jacobsen C, Lou S, Villa C. 3D printed skulls in court - a benefit to stakeholders? Int J Legal Med 2023; 137:1865-1873. [PMID: 37391670 PMCID: PMC10567900 DOI: 10.1007/s00414-023-03054-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 06/20/2023] [Indexed: 07/02/2023]
Abstract
Forensic pathologists may use 3D prints as demonstrative aids when providing expert testimony in court of law, but the effects remain unclear despite many assumed benefits. In this qualitative study, the effects of using a 3D print, demonstrating a blunt force skull fracture, in court were explored by thematic analysis of interviews with judges, prosecutors, defence counsels, and forensic pathologists with the aim of improving the expert testimony. Five semi-structured focus groups and eight one-to-one interviews with a total of 29 stakeholders were transcribed ad verbatim and analysed using thematic analysis. The study found that a highly accurate 3D print of a skull demonstrated autopsy findings in detail and provided a quick overview, but sense of touch was of little benefit as the 3D print had different material characteristics than the human skull. Virtual 3D models were expected to provide all the benefits of 3D prints, be less emotionally confronting, and be logistically feasible. Both 3D prints and virtual 3D models were expected to be less emotionally confronting than autopsy photos. Regardless of fidelity, an expert witness was necessary to translate technical language and explain autopsy findings, and low-fidelity models may be equally suited as demonstrative aids. The court infrequently challenged the expert witnesses' conclusions and, therefore, rarely had a need for viewing autopsy findings in detail, therefore rarely needing a 3D print.
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Affiliation(s)
- Mikkel Jon Henningsen
- Section of Forensic Pathology, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
| | - Lykke Thorlacius-Ussing
- Section of Forensic Pathology, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Lotte Groth Jensen
- DEFACTUM, Public Health & Health Services Research, Central Denmark Region, Aarhus, Denmark
| | - Kasper Hansen
- Department of Forensic Medicine, Faculty of Health, Aarhus University, Aarhus, Denmark
| | - Christina Jacobsen
- Section of Forensic Pathology, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Stina Lou
- DEFACTUM, Public Health & Health Services Research, Central Denmark Region, Aarhus, Denmark
| | - Chiara Villa
- Section of Forensic Pathology, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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3
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Esposito M, Sessa F, Cocimano G, Zuccarello P, Roccuzzo S, Salerno M. Advances in Technologies in Crime Scene Investigation. Diagnostics (Basel) 2023; 13:3169. [PMID: 37891990 PMCID: PMC10605839 DOI: 10.3390/diagnostics13203169] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 10/08/2023] [Accepted: 10/09/2023] [Indexed: 10/29/2023] Open
Abstract
Crime scene investigation (CSI) is the complex act of reconstructing the dynamics that led to a crime and the circumstances of its perpetration. Crystallizing the CSI is a difficult task for the forensic pathologist; however, it is often requested by the public prosecutor and many judicial cases remain unsolved precisely for this reason. Recent years have seen an improvement in the ability of 3D scanning technology to obtain dense surface scans of large-scale spaces, for surveying, engineering, archaeology, and medical purposes such as forensics. The applications of this new technology are growing every day: forensic measurement of wounds in clinical reports, for example, reconstruction of traffic accidents, bullet trajectory studies in gunshot wounds, and 3D bloodstain pattern analysis. A retrospective analysis was conducted across all crime scene investigations performed by the forensic staff of the Department of Forensic Pathology of the University of Catania from January 2019 to June 2022. Inclusion criteria were the use of a laser scanner (LS), the use of a camera, a full investigative scene, and collection of circumstantial data thanks to the help of the judicial police. Cases in which the LS was not used were excluded. Out of 200 CSIs, 5 were included in the present study. In case number 1, the use of the LS made it possible to create a complete scale plan of the crime scene in a few hours, allowing a ship to be quickly returned to the judicial police officer. In case 2 (fall from a height), the LS clarified the suicidal intent of the deceased. In case number 3 it was possible to reconstruct a crime scene after many years. In case 4, the LS provided a great contribution in making a differential diagnosis between suicide and homicide. In case 5, the LS was fundamental for the COVID team in planning the study of COVID-19 pathways and areas within a hospital with the aim of reduction of nosocomial transmission. In conclusion, the use of the LS allowed the forensic staff to crystallize the investigative scene, making it a useful tool.
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Affiliation(s)
| | - Francesco Sessa
- Department of Medical, Surgical and Advanced Technologies "G.F. Ingrassia", University of Catania, 95121 Catania, Italy
| | - Giuseppe Cocimano
- Department of Mental and Physical Health and Preventive Medicine, University of Campania "Vanvitelli", 80121 Napoli, Italy
| | - Pietro Zuccarello
- Laboratory of Forensic Toxicology, Department "G.F. Ingrassia", University of Catania, 95124 Catania, Italy
| | - Salvatore Roccuzzo
- Department of Medical, Surgical and Advanced Technologies "G.F. Ingrassia", University of Catania, 95121 Catania, Italy
| | - Monica Salerno
- Department of Medical, Surgical and Advanced Technologies "G.F. Ingrassia", University of Catania, 95121 Catania, Italy
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4
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Shah SWA, Xu Q, Ullah MW, Zahoor, Sethupathy S, Morales GM, Sun J, Zhu D. Lignin-based additive materials: A review of current status, challenges, and future perspectives. ADDITIVE MANUFACTURING 2023; 74:103711. [DOI: 10.1016/j.addma.2023.103711] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/23/2024]
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5
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Flaherty TM, Byrnes JF, Maddalena A. Misgendering a transgender woman using FORDISC 3.1: A case study. Forensic Sci Int Synerg 2023; 7:100342. [PMID: 37415608 PMCID: PMC10320518 DOI: 10.1016/j.fsisyn.2023.100342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 06/07/2023] [Accepted: 06/09/2023] [Indexed: 07/08/2023]
Abstract
•FORDISC was unable to classify a transgender woman despite her extensive gender-affirming medical care, including Facial Feminization Surgeries.•This case study demonstrates that there is a need for forensic anthropologists to educate themselves on cases that may involve transgender people.•The use of a biocultural approach will allow forensic anthropologists to better identify marginalized individuals, including transgender women.
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6
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Carew RM, French J, Morgan RM. Drilling down into ethics: A thematic review of ethical considerations for the creation and use of 3D printed human remains in crime reconstruction. Sci Justice 2023; 63:330-342. [PMID: 37169458 DOI: 10.1016/j.scijus.2023.03.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 03/01/2023] [Accepted: 03/20/2023] [Indexed: 04/03/2023]
Abstract
The existing literature contains some exploration of the ethics concerning human remains in forensic and virtual anthropology. However, previous work has stopped short of interrogating the underlying ethical concepts. The question of how people understand and apply these concepts in practice, and what it means to act ethically, remain underexplored. This thematic review explores the ethical considerations that contribute to the creation and use of 3D printed human remains for forensic purposes. The three main branches of ethical theory are outlined to explore how they may apply to forensic practice. Key themes relating to 3D printing human remains in forensic contexts were explored to better understand the ethics landscape, ethical challenges, and the current guidelines in place. Through this thematic review, nine ethics principles were identified as key principles for guiding best practice: anonymity, autonomy, beneficence, consent, context, justice, non-maleficence, proportionality, and transparency. It is suggested that these principles could be incorporated into adaptable guidelines going forward to support ethical practice. The findings also suggest that holistic ethics cognition training may have value in supporting forensic scientists in ethical decision-making, together with procedural and structural design that may promote best practice and reduce cognitive load.
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7
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Carew RM, French J, Rando C, Morgan RM. Exploring public perceptions of creating and using 3D printed human remains. FORENSIC SCIENCE INTERNATIONAL: REPORTS 2023. [DOI: 10.1016/j.fsir.2023.100314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023] Open
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8
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Lo M, Mariconti E, Nakhaeizadeh S, Morgan RM. Preparing computed tomography images for machine learning in forensic and virtual anthropology. Forensic Sci Int Synerg 2023; 6:100319. [PMID: 36852172 PMCID: PMC9958428 DOI: 10.1016/j.fsisyn.2023.100319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 02/02/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023]
Affiliation(s)
- Martin Lo
- UCL Department of Security and Crime Science, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK,UCL Centre for the Forensic Sciences, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK,Corresponding author. UCL Department of Security and Crime Science, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK.
| | - Enrico Mariconti
- UCL Department of Security and Crime Science, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK
| | - Sherry Nakhaeizadeh
- UCL Department of Security and Crime Science, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK,UCL Centre for the Forensic Sciences, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK
| | - Ruth M. Morgan
- UCL Department of Security and Crime Science, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK,UCL Centre for the Forensic Sciences, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK
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9
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Errickson D, Carew RM, Collings AJ, Biggs MJP, Haig P, O'Hora H, Marsh N, Roberts J. A survey of case studies on the use of forensic three-dimensional printing in England and Wales. Int J Legal Med 2022; 136:1605-1619. [PMID: 35939108 PMCID: PMC9576664 DOI: 10.1007/s00414-022-02872-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 08/02/2022] [Indexed: 11/23/2022]
Abstract
3D printing has rapidly developed and been applied in forensic science due to its use in creating demonstrations for courts of law. Much of the literature on this specific topic has focused on the use of 3D printed models in academia, the potential influence on a jury, and its use as a long-term documentation process, but with few actual forensic case examples. This paper offers an insight into the development of 3D printing in forensic practice and how 3D printing is currently being used in the criminal justice system in England and Wales. A series of case reports were gathered from multiple police forces and forensic practitioners in the UK to identify how 3D printing was being used. These discussions established who was requesting 3D printed exhibits, what type of technologies were being utilised, what type of exhibits were being printed, and resulting feedback for the use of 3D printed material within a criminal case. As a result, this research demonstrates the current use of 3D printing in England and Wales, discussing the associated cases that have been known to incorporate 3D prints. Likewise, this work explores the limitations that have been encountered by forensic practitioners and identifies a series of research questions that should be considered in future investigations.
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Affiliation(s)
- D Errickson
- Cranfield Forensic Institute, Cranfield University, College Road, Bedford, MK43 0AL, UK.
| | - R M Carew
- School of Life Sciences, Coventry University, Priory Street, Coventry, CV1 5FB, UK
| | - A J Collings
- School of Chemical and Physical Sciences, Keele University, Stafordshire, ST5 5BG, UK
| | - M J P Biggs
- East Midlands Forensic Pathology Unit, University of Leicester, Robert Kilpatrick Building, Leicester, LE2 7LX, UK
| | - P Haig
- South West Forensics Imaging Hub, Police HQ, Exeter, Middlemoor, UK
| | - H O'Hora
- South West Forensics Imaging Hub, Police HQ, Exeter, Middlemoor, UK
| | - N Marsh
- Metropolitan Police, 109 Lambeth Road, London, SE1 7LP, UK
| | - J Roberts
- School of Biological and Environmental Sciences, Liverpool John Moores University, Exchange Station, Liverpool, L2 2QP, UK
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10
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Application of 3D printing in assessment and demonstration of stab injuries. Int J Legal Med 2022; 136:1431-1442. [PMID: 35657431 PMCID: PMC9375752 DOI: 10.1007/s00414-022-02846-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 05/23/2022] [Indexed: 11/17/2022]
Abstract
In stabbing related fatalities, the forensic pathologist has to assess the direction of wound track (thus, the direction of the stabbing) and the weapon’s possible characteristics by examining the stab wound. The determination of these characteristics can be made only with a high level of uncertainty, and the precise direction of the stabbing is often difficult to assess if only soft tissues are injured. Previously reported techniques used for the assessment of these wound characteristics have substantial limitations. This manuscript presents a method using today’s easily accessible three-dimensional (3D) printing technology for blade-wound comparison and wound track determination. Scanning and 3D printing of knives is a useful method to identify weapons and determine the precise stabbing direction in a stabbing incident without compromising the trace evidence or the autopsy results. Ballistic gel experiment, and dynamic stabbing test experiments prove the method can be applied in safety, without compromising the autopsy results. Identification of the exact knife is not possible with complete certainty but excluding certain knives will decrease the number of necessary DNA examinations, hence it can lower the burden on forensic genetic laboratories. The method addresses many of the shortcomings of previously used methods of probe insertion or post-mortem CT. Insertion of the printed knife into the wound gives a good visual demonstration of the stabbing direction, thus easing the forensic reconstruction of the stabbing incident. After combining the 3D printing with photogrammetry, the achieved 3D visualization is useful for courtroom demonstration and educational purposes.
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11
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Wang H, Yu H, Zhou X, Zhang J, Zhou H, Hao H, Ding L, Li H, Gu Y, Ma J, Qiu J, Ma D. An Overview of Extracellular Matrix-Based Bioinks for 3D Bioprinting. Front Bioeng Biotechnol 2022; 10:905438. [PMID: 35646886 PMCID: PMC9130719 DOI: 10.3389/fbioe.2022.905438] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Accepted: 04/26/2022] [Indexed: 12/20/2022] Open
Abstract
As a microenvironment where cells reside, the extracellular matrix (ECM) has a complex network structure and appropriate mechanical properties to provide structural and biochemical support for the surrounding cells. In tissue engineering, the ECM and its derivatives can mitigate foreign body responses by presenting ECM molecules at the interface between materials and tissues. With the widespread application of three-dimensional (3D) bioprinting, the use of the ECM and its derivative bioinks for 3D bioprinting to replicate biomimetic and complex tissue structures has become an innovative and successful strategy in medical fields. In this review, we summarize the significance and recent progress of ECM-based biomaterials in 3D bioprinting. Then, we discuss the most relevant applications of ECM-based biomaterials in 3D bioprinting, such as tissue regeneration and cancer research. Furthermore, we present the status of ECM-based biomaterials in current research and discuss future development prospects.
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Affiliation(s)
- Haonan Wang
- Department of Radiology, The Second Affiliated Hospital of Shandong First Medical University, Tai’an, China
- Department of Clinical Medicine, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Huaqing Yu
- Department of Radiology, The Second Affiliated Hospital of Shandong First Medical University, Tai’an, China
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Xia Zhou
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Jilong Zhang
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Hongrui Zhou
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Haitong Hao
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Lina Ding
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Huiying Li
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Yanru Gu
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Junchi Ma
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Jianfeng Qiu
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
| | - Depeng Ma
- Department of Radiology, The Second Affiliated Hospital of Shandong First Medical University, Tai’an, China
- Department of Radiology, Shandong First Medical University and Shandong Academy of Medical Sciences, Tai’an, China
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12
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Image segmentation of post-mortem computed tomography data in forensic imaging: Methods and applications. FORENSIC IMAGING 2022. [DOI: 10.1016/j.fri.2021.200483] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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13
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Johnson DA, Jani G, Pandey A. Application of 3D Scanning and 3D Printing in Forensic Practices - A Preliminary Survey among Forensic Practitioners in India. FORENSIC IMAGING 2022. [DOI: 10.1016/j.fri.2022.200498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Carew RM, French J, Morgan RM. Suitability of 3D printing cranial trauma: Prospective novel applications and limitations of 3D replicas. FORENSIC SCIENCE INTERNATIONAL: REPORTS 2021. [DOI: 10.1016/j.fsir.2021.100218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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15
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Carew RM, French J, Morgan RM. 3D forensic science: A new field integrating 3D imaging and 3D printing in crime reconstruction. Forensic Sci Int Synerg 2021; 3:100205. [PMID: 34746730 PMCID: PMC8556510 DOI: 10.1016/j.fsisyn.2021.100205] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Accepted: 10/13/2021] [Indexed: 11/17/2022]
Abstract
3D techniques are increasingly being used by forensic scientists in crime reconstruction. The proliferation of 3D techniques, such as 3D imaging and printing being employed across the various stages of the forensic science process, means that the use of 3D should be considered as a distinct field within forensic science. '3D Forensic Science' ('3DFS') is therefore presented in this paper as a field that brings together a range of 3D techniques and approaches that have been developed within different areas of forensic science for achieving crime reconstructions and interpreting and presenting evidence. It is argued that by establishing this distinct field, defining its boundaries, and developing expertise, best practice and standards, the contribution of 3DFS to the criminal justice system can be maximised and the accuracy and robustness of crime reconstruction endeavours can be enhanced.
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Affiliation(s)
- Rachael M. Carew
- UCL Department of Security and Crime Science, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK
- UCL Centre for the Forensic Sciences, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK
| | - James French
- UCL Department of Security and Crime Science, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK
- UCL Centre for the Forensic Sciences, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK
| | - Ruth M. Morgan
- UCL Department of Security and Crime Science, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK
- UCL Centre for the Forensic Sciences, University College London, 35 Tavistock Square, London, WC1H 9EZ, UK
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Johnson A, Jani G, Carew R, Pandey A. Assessment of the accuracy of 3D printed teeth by various 3D printers in forensic odontology. Forensic Sci Int 2021; 328:111044. [PMID: 34653828 DOI: 10.1016/j.forsciint.2021.111044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 04/16/2021] [Accepted: 10/04/2021] [Indexed: 11/16/2022]
Abstract
Additive manufacturing technology has benefited many sectors, and its use in forensic sciences has opened up a variety of new opportunities for analysing and exhibiting forensic materials. However, to perform analytical procedures on 3D printed bones and teeth in forensic odontology, the metric and morphological precision of the printed replicas must first be validated. To address this, the present study was undertaken using 12 extracted human teeth that were 3D printed using five different techniques. Manual measurements and a digital mesh comparison were used to evaluate the metric precision of all samples. The findings showed that the printed replicas were accurate to within 0.5 mm of the actual teeth. It was suggested that Digital Light Processing (DLP) prints be used for potential forensic odontology applications based on measurements, digital comparison, and ease of use.
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Affiliation(s)
- Abraham Johnson
- Laboratory of Forensic Odontology, School of Forensic Science, National Forensic Sciences University, Gujarat, India.
| | - Gargi Jani
- Laboratory of Forensic Odontology, School of Forensic Science, National Forensic Sciences University, Gujarat, India.
| | - Rachael Carew
- UCL Department of Security and Crime Science, 35 Tavistock Square, London WC1H 9EZ, UK; UCL Centre for the Forensic Sciences, 35 Tavistock Square, London WC1H 9EZ, UK.
| | - Astha Pandey
- School of Forensic Science, National Forensic Sciences University, Gujarat, India.
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Rizwal AA, Azahar N, Reduwan NH, Yusof MYPM. Superimposed polygonal approximation analysis comparing 2D photography and 3D scanned images of bite marks on human skin. EGYPTIAN JOURNAL OF FORENSIC SCIENCES 2021. [DOI: 10.1186/s41935-021-00233-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Preservation of bite marks evidence has always been a major problem in forensic odontology due to progressive loss of details as time passes. The use of 2D photographs has been widely used to document forensic evidence and preserving bite marks; however, there are limitations to this method. This study aims to measure the accuracy of the 3D scanned image in comparison to 2D photograph registration of experimental bite marks. Thirty volunteers performed self-exertions of a bite mark on the respective forearm of subjects. A 2D photograph and 3D scanned image was immediately registered following bite mark exercise using a conventional camera and Afinia EinScan-Pro 2X PLUS Handheld 3D Scanner, respectively. The outlines of the bite mark were transformed into a polygonal shape. Next, the polygonal approximation analysis was performed by an arbitrary superimposition method. The difference between surface areas of both images was calculated (2D photographs ̶ 3D scanned images).
Results
A paired t test was used to measure significance with α = 0.05. The mean surface area of 2D photographs and 3D scanned images is 31.535 cm2 and 31.822 cm2, respectively. No statistical difference was found between both mean surface areas (p > 0.05). The mean error (ME) is 0.287 ± 3.424 cm2 and the mean absolute error (MAE) is 1.733 ± 1.149 cm2.
Conclusion
Bite marks registered with the 3D scanned image are comparable to the standard 2D photograph for bite mark evaluations. The use of a 3D scan may be adopted as a standard operating procedure in the forensic application, especially for evidence preservation.
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18
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A review of visualization techniques of post-mortem computed tomography data for forensic death investigations. Int J Legal Med 2021; 135:1855-1867. [PMID: 33931808 PMCID: PMC8354982 DOI: 10.1007/s00414-021-02581-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 03/16/2021] [Indexed: 11/17/2022]
Abstract
Postmortem computed tomography (PMCT) is a standard image modality used in forensic death investigations. Case- and audience-specific visualizations are vital for identifying relevant findings and communicating them appropriately. Different data types and visualization methods exist in 2D and 3D, and all of these types have specific applications. 2D visualizations are more suited for the radiological assessment of PMCT data because they allow the depiction of subtle details. 3D visualizations are better suited for creating visualizations for medical laypersons, such as state attorneys, because they maintain the anatomical context. Visualizations can be refined by using additional techniques, such as annotation or layering. Specialized methods such as 3D printing and virtual and augmented reality often require data conversion. The resulting data can also be used to combine PMCT data with other 3D data such as crime scene laser scans to create crime scene reconstructions. Knowledge of these techniques is essential for the successful handling of PMCT data in a forensic setting. In this review, we present an overview of current visualization techniques for PMCT.
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Jani G, Johnson A, Marques J, Franco A. Three-dimensional(3D) printing in forensic science–An emerging technology in India. ANNALS OF 3D PRINTED MEDICINE 2021. [DOI: 10.1016/j.stlm.2021.100006] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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