Forensic image identification
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Rentgenové vyšetření je základní, nezbytnou a nejčastěji využívanou zobrazovací metodou v soudním lékařství. Slouží k zobrazení a lokalizaci cizích (rentgen kontrastních) předmětů v těle, k průkazu úrazových i chorobných změn a k antropologické identifikaci. Nejčastěji se využívá při hodnocení střelných poranění, bodnořezných poranění a dopravních úrazů; zcela nezastupitelné je pak při posuzování úmrtí, která souvisejí s týráním. Hlavním smyslem rentgenového vyšetření je hodnocení konvenční pitvou těžko přístupných kostěných struktur, predikce pitevního nálezu a volba optimální strategie postupu celé pitvy. Vedle rentgenového vyšetření se v současné době stále více uplatňují v soudním lékařství moderní zobrazovací metody, zejména počítačová tomografie a magnetická rezonance. Jejich aplikace na mrtvé tělo se označuje jako tzv. virtuální pitva.
X-ray is the most common, basic and essential imaging method used in forensic medicine. It serves to display and localize the foreign objects in the body and helps to detect various traumatic and pathological changes. X-ray imaging is valuable in anthropological assessment of an individual. X-ray allows non-invasive evaluation of important findings before the autopsy and thus selection of the optimal strategy for dissection. Basic indications for postmortem X-ray imaging in forensic medicine include gunshot and explosive fatalities (identification and localization of projectiles or other components of ammunition, visualization of secondary missiles), sharp force injuries (air embolism, identification of the weapon) and motor vehicle related deaths. The method is also helpful for complex injury evaluation in abused victims or in persons where abuse is suspected. Finally, X-ray imaging still remains the gold standard method for identification of unknown deceased. With time modern imaging methods, especially computed tomography and magnetic resonance imaging, are more and more applied in forensic medicine. Their application extends possibilities of the visualization the bony structures toward a more detailed imaging of soft tissues and internal organs. The application of modern imaging methods in postmortem body investigation is known as digital or virtual autopsy. At present digital postmortem imaging is considered as a bloodless alternative to the conventional autopsy.
Technický rozmach v oblastí zobrazovacích metód neobišiel ani súdne lekárstvo. V prípade forenznej antropológie všetky tieto metódy okrem spresnenia získaných informácií o mŕtvom tele rozširujú možnosti použitia v praxi aj pri identifikácii a určovaní veku živých osôb. Za použitia najnovšej dostupnej literatúry autori ponúkajú príklady praktického využitia konvenčnej rádiológie, počítačovej tomografie, magnetickej rezonancie, prípadne aj ultrasonografie v súdnolekárskej praxi.
Massive progress in developing even more precise imaging modalities influenced all medical branches including the forensic medicine. In forensic anthropology, an inevitable part of forensic medicine itself, the use of all imaging modalities becomes even more important. Despite of acquiring more accurate informations about the deceased, all of them can be used in the process of identification and/or age estimation. X – ray imaging is most commonly used in detecting foreign bodies or various pathological changes of the deceased. Computed tomography, on the other hand, can be very helpful in the process of identification, whereas outcomes of this examination can be used for virtual reconstruction of living objects. Magnetic resonance imaging offers new opportunities in detecting cardiovascular pathological processes or develompental anomalies. Ultrasonography provides promising results in age estimation of living subjects without excessive doses of radiation. Processing the latest information sources available, authors introduce the application examples of X – ray imaging, computed tomography, magnetic resonance imaging and ultrasonography in everyday forensic medicine routine, with particular focusing on forensic anthropology.
3D Multislice and Cone-beam computed tomography (CBCT) in forensic odontology has been shown to be useful not only in terms of one or a few of dead bodies but also in multiple fatality incidents. 3D Multislice and Cone-beam computed tomography and digital radiography were demonstrated in a forensic examination form. 3D images of the skull and teeth were analysed and validated for long ante mortem/post mortem intervals. The image acquisition was instantaneous; the images were able to be optically enlarged, measured, superimposed and compared prima vista or using special software and exported as a file. Digital radiology and computer tomography has been shown to be important both in common criminalistics practices and in multiple fatality incidents. Our study demonstrated that CBCT imaging offers less image artifacts, low image reconstruction times, mobility of the unit and considerably lower equipment cost.
Podstatou rekognície ako jednej z foriem kriminalistickej identifikácie je znovupoznávanie, ktoré sa môže uskutočniť iba vtedy, pokiaľ vo vedomí človeka existuje pamäťová stopa, ktorá sa vzťahuje k určitej kriminalisticky relevantnej udalosti. Obraz zafixovaný v pamäťovej stope si znovupoznávajúca osoba vybaví v priebehu rekognície vo forme predstavy, ktorú porovnáva s odrazom (momentálnym vnímaním) predvádzaného (ukazovaného) objektu vo svojom vedomí. Príspevok sa zaoberá základným vymedzením, podstatou, významom ako aj subjektmi rekognície, pričom konkrétnejšie sa zapodieva zvláštnosťami jej jednotlivých druhov. Ďalšia časť článku podrobnejšie rozoberá jednotlivé faktory, ktoré ovplyvňujú presnosť pamäte očitého svedka, vrátane rekognície a sú rozdelené na tie, ktoré môžu, a na tie, ktoré nemôžu kontrolovať orgány činné v trestnom konaní.
Recognition of human individuals plays a major role in forensic identification. It occurs only if person's mind contains a memory trace which relates to a relevant event. The person creates an image in their mind from their memory trace while they compare it to their current reflection (representation) of the observed object. This article explains definition and meaning of recognition, participants' role, and discusses various categories and their characteristic attributes in recognition. The content then moves to the factors which influence eyewitness's memory accuracy including recognition and distinguishes between the factors law enforcement can and cannot affect.
- MeSH
- kriminální psychologie * metody MeSH
- kriminologie * metody MeSH
- lidé MeSH
- paměť * MeSH
- psychický stres komplikace MeSH
- rozpoznávání (psychologie) * MeSH
- zločin MeSH
- zločinci * MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- přehledy MeSH
Forensic dentistry plays a major role in body identification. The dental examination is very accurate and also, nowadays, in the time of a comprehensive fingerprint and DNA assessment, objectively supported. The identification, which is based on the dental documentation, leads up to 43-89% of a successful process. The purpose of the study is to describe the techniques employed by forensic odontology to identify human remains and also to provide details of some of the novel developments within this area. Comparative methods of dental identification of the unknown subject with pre-mortem clinical records, X-ray images, implant presence, superimposition and DNA analysis confirm the identity of the individual. It was shown that dental identification of a person is based on unique individual characteristics of the dentition and dental restorations, relative resistance of the mineralised dental tissues and dental restorations to changes resulting from decomposition and harsh environmental extremes such as conditions of temperature and violent physical forces.
- MeSH
- DNA fingerprinting MeSH
- DNA izolace a purifikace MeSH
- lidé MeSH
- mikroskopie elektronová rastrovací * MeSH
- počítačové zpracování obrazu MeSH
- rentgendiagnostika panoramatická MeSH
- software MeSH
- soudní stomatologie metody MeSH
- trvalá zubní náhrada MeSH
- zubní slitiny chemie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Forensic dental identification has employed traditionally 2D digital radiological imaging techniques. More recently, 3D cone beam computer tomography (CBCT) data, widely applied in clinical dentistry, have been gradually used. The purpose of this study was to compare the precision and quality of 2D digital orthopantomogram (OPG) and 2D OPG images generated from cone beam computed tomography (CBCT). The study sample consisted of 50 patients with archived conventional 2D OPG and 3D CBCT images. Patients signed an informed consent form to take part in our study. Measurements of the mandible, teeth and dental restorations were taken by two observers on calibrated 2D OPG and 3D CBCT-to-OPG images using measurement functionalities of DOPLHIN software. Acquired dimensions were compared side by side and images of fillings were superimposed. For better visual comparison and more efficient image registration, the methods of spline interpolation were used. The pairs of absolute measurements obtained from conventional OPG and CBCT-to-OPG-converted images were highly correlated (p < 0.05). However, larger, and horizontally measured distances were revealed to be more affected than shorter vertically taken measurements. In relative terms, CBCT-generated width/length indices of the canines and the first molars ranged from 84% to 99.8% of those acquired from traditional OPGs. In addition, corresponding points on the teeth and fillings were compared side by side and in superimposition. The average coincidence of images was 6.1%. The results revealed that for selected metric variables 2D OPGs and 3D CBCT-generated OPGs were complementary and could be used for forensic comparisons.
- MeSH
- digitální zubní radiografie metody MeSH
- lidé MeSH
- mandibula MeSH
- počítačová tomografie s kuželovým svazkem metody MeSH
- rentgendiagnostika panoramatická metody MeSH
- senzitivita a specificita MeSH
- soudní stomatologie * metody MeSH
- trvalá zubní náhrada MeSH
- zuby MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- srovnávací studie MeSH
While assessing skeletal injuries in human skeletal remains, forensic anthropologists are frequently presented with fractured, fragmented, or otherwise modified skeletal remains. The examination of evidence and the mechanisms of skeletal injuries often require that separate osseous elements be permanently or temporarily reassembled or reconstructed. If not dealt with properly, such reconstructions may impede accurate interpretation of the evidence. Nowadays, routine forensic examinations increasingly incorporate digital imaging technologies. As a result, a variety of PC-assisted imaging techniques, collectively referred to as the virtual approach, have been made available to treat fragmentary skeletal remains. The present study employs a 3D virtual approach to assess mechanisms of skeletal injuries, and provides an expert opinion of causative tools in three forensic cases involving human skeletal remains where integrity was compromised by multiple peri- or postmortem alterations resulting in fragmentation and/or incompleteness. Three fragmentary skulls and an incomplete set of foot bones with evidence of perimortem fractures (gunshot wounds) and sharp force trauma (saw marks) were digitized using a desktop laser scanner. The digitized skeletal elements were reassembled in the virtual workspace using functionalities incorporated in AMIRA® version 5.0 software, and simultaneously in real physical space by traditional reconstructive approaches. For this study, the original skeletal fragments were substituted by replicas built by 3D printing. Inter-method differences were quantified by mesh-based comparison after the physically reassembled elements had been re-digitized. Observed differences were further reinforced by visualizing local variations using colormaps and other advanced 3D visualization techniques. In addition, intra-operator and inter-operator error was computed. The results demonstrate that the importance of incorporating the virtual approach into the assessment of skeletal injuries increases with the complexity and state of preservation of a forensic case. While in relatively simple cases the virtual approach is a welcome extension to a traditional approach, which merely facilitates the analysis, in more complex and extensively fragmentary cases such as multiple gunshot wounds or dismemberment, the virtual approach can be a crucial step in applying the principles of gunshot wounds or sharp force traumatic mechanisms. The unrestricted manipulation with digital elements enabling limitless repairs and adjustments to a "best-case scenario" also produced smaller inter-operator variation in comparison to the traditional approach.
- MeSH
- 3D tisk MeSH
- dospělí MeSH
- fraktury kostí patologie MeSH
- fraktury lebky patologie MeSH
- kosti nohy (od hlezna dolů) zranění patologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- penetrující rány patologie MeSH
- počítačová simulace * MeSH
- počítačové zpracování obrazu * MeSH
- soudní antropologie metody MeSH
- střelné rány patologie MeSH
- zobrazování trojrozměrné MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- kazuistiky MeSH
In today's biometric and commercial settings, state-of-the-art image processing relies solely on artificial intelligence and machine learning which provides a high level of accuracy. However, these principles are deeply rooted in abstract, complex "black-box systems". When applied to forensic image identification, concerns about transparency and accountability emerge. This study explores the impact of two challenging factors in automated facial identification: facial expressions and head poses. The sample comprised 3D faces with nine prototype expressions, collected from 41 participants (13 males, 28 females) of European descent aged 19.96 to 50.89 years. Pre-processing involved converting 3D models to 2D color images (256 × 256 px). Probes included a set of 9 images per individual with head poses varying by 5° in both left-to-right (yaw) and up-and-down (pitch) directions for neutral expressions. A second set of 3,610 images per individual covered viewpoints in 5° increments from -45° to 45° for head movements and different facial expressions, forming the targets. Pair-wise comparisons using ArcFace, a state-of-the-art face identification algorithm yielded 54,615,690 dissimilarity scores. Results indicate that minor head deviations in probes have minimal impact. However, the performance diminished as targets deviated from the frontal position. Right-to-left movements were less influential than up and down, with downward pitch showing less impact than upward movements. The lowest accuracy was for upward pitch at 45°. Dissimilarity scores were consistently higher for males than for females across all studied factors. The performance particularly diverged in upward movements, starting at 15°. Among tested facial expressions, happiness and contempt performed best, while disgust exhibited the lowest AUC values.
- MeSH
- algoritmy * MeSH
- automatizované rozpoznávání obličeje * metody MeSH
- biometrická identifikace metody MeSH
- dospělí MeSH
- hlava - pohyby fyziologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladý dospělý MeSH
- obličej anatomie a histologie MeSH
- počítačové zpracování obrazu metody MeSH
- postura těla fyziologie MeSH
- výraz obličeje * MeSH
- zobrazování trojrozměrné MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
Image analysis methods commonly used in forensic anthropology do not have desirable robustness properties, which can be ensured by robust statistical methods. In this paper, the face localization in images is carried out by detecting symmetric areas in the images. Symmetry is measured between two neighboring rectangular areas in the images using a new robust correlation coefficient, which down-weights regions in the face violating the symmetry. Raw images of faces without usual preliminary transformations are considered. The robust correlation coefficient based on the least weighted squares regression yields very promising results also in the localization of such faces, which are not entirely symmetric. Standard methods of statistical machine learning are applied for comparison. The robust correlation analysis can be applicable to other problems of forensic anthropology.
- MeSH
- dospělí MeSH
- lidé MeSH
- lineární modely MeSH
- mladiství MeSH
- mladý dospělý MeSH
- obličej anatomie a histologie MeSH
- počítačové zpracování obrazu MeSH
- soudní antropologie MeSH
- statistické modely MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mladiství MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
The virtual approach in physical and forensic anthropology is increasingly used to further analyze human remains, but also to propose new didactic means for visualization and dissemination of scientific results. Computerized facial approximation (FA) offers an alternative to manual methods, but usually requires a complete facial skeleton to allow for the estimation of the facial appearance of an individual. This paper presents the case of Tycho Brahe, Danish astronomer born during the XVIth century, whose remains were reanalyzed at the occasion of a short exhumation in 2010. Cranial remains of Brahe were poorly preserved, with only a partial facial skeleton, and virtual anthropology tools were used to estimate the missing parts of his skull. This 3D restoration was followed by a FA using TIVMI-AFA3D, subsequently textured with graphic tools. The result provided an interesting estimate that was compared with portraits of the astronomer. The impact of the missing data estimation was investigated by performing FAs on 10 complete test subjects and the same 10 subjects after cropping and estimating 50% of the landmarks (reproducing the preservation state of Tycho Brahe's cranial remains). The comparison between the FA based on the complete and incomplete skulls of the same subject produced a visual assessment of the estimation impact on FAs which is relatively low. This procedure is an alternative to manual methods and offers a reproducible estimate of a face based on incomplete cranial remains. Although the case report concerns a historical individual, the robust automatic estimation of missing landmarks followed by a FA has value for forensic caseworks as a support to the identification process.
- MeSH
- anatomická značka MeSH
- dějiny 16. století MeSH
- dějiny 17. století MeSH
- lebka anatomie a histologie MeSH
- lidé MeSH
- obličej anatomie a histologie MeSH
- počítačové zpracování obrazu * MeSH
- software * MeSH
- soudní antropologie metody MeSH
- významné osobnosti MeSH
- zobrazování trojrozměrné MeSH
- Check Tag
- dějiny 16. století MeSH
- dějiny 17. století MeSH
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- historické články MeSH
