18 results on '"Lynnerup, Niels"'
Search Results
2. The Status of Forensic Anthropology in Europe and South Africa: Results of the 2016 FASE Questionnaire on Forensic Anthropology.
- Author
-
Obertová, Zuzana, Adalian, Pascal, Baccino, Eric, Cunha, Eugenia, De Boer, Hans H., Fracasso, Tony, Kranioti, Elena, Lefévre, Philippe, Lynnerup, Niels, Petaros, Anja, Ross, Ann, Steyn, Maryna, and Cattaneo, Cristina
- Subjects
FORENSIC anthropology ,GRADUATE education ,ANTHROPOLOGISTS ,QUESTIONNAIRES ,FORENSIC sciences ,SOUTH Africans - Abstract
One of the goals of the Forensic Anthropology Society of Europe (FASE) is to map the existing education and practice opportunities in the field of forensic anthropology in order to support the development of the discipline and to optimize the training courses provided by the Society. To address this goal, an online questionnaire was sent to European and South African practitioners of forensic anthropology and related disciplines in 2016. The results of the questionnaire showed that the status and roles of forensic anthropologists vary depending on the national legal systems, education, and employment status of the practitioners. Despite the fact that the expertise of forensic anthropologists has been increasingly requested in a variety of investigations and the spectrum of tasks has become broader, including identification of living persons, specialized education in forensic anthropology is still restricted to a few graduate and postgraduate programs in European countries and to annual FASE courses. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
3. Validation of the New Interpretation of Gerasimov's Nasal Projection Method for Forensic Facial Approximation Using CT Data.
- Author
-
Maltais Lapointe, Genevieve, Lynnerup, Niels, and Hoppa, Robert D.
- Subjects
- *
FACE perception , *BIOMETRIC identification , *FORENSIC anthropology , *FORENSIC anthropology laboratories , *FORENSIC science equipment , *FORENSIC sciences - Abstract
The most common method to predict nasal projection for forensic facial approximation is Gerasimov's two-tangent method. Ullrich H, Stephan CN ( J Forensic Sci, 2011; 56: 470) argued that the method has not being properly implemented and a revised interpretation was proposed. The aim of this study was to compare the accuracy of both versions using a sample of 66 postmortem cranial CT data. The true nasal tip was defined using pronasale and nasal spine line, as it was not originally specified by Gerasimov. The original guidelines were found to be highly inaccurate with the position of the nasal tip being overestimated by c. 2 cm. Despite the revised interpretation consistently resulting in smaller distance from true nasal tip, the method was not statistically accurate ( p > 0.05) in positioning the tip of the nose (absolute distance >5 mm). These results support that Gerasimov's method was not properly performed, and Ullrich H, Stephan CN ( J Forensic Sci, 2011; 56: 470) interpretation should be used instead. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
4. Quantitative Analysis of the Morphological Changes of the Pubic Symphyseal Face and the Auricular Surface and Implications for Age at Death Estimation.
- Author
-
Villa, Chiara, Buckberry, Jo, Cattaneo, Cristina, Frohlich, Bruno, and Lynnerup, Niels
- Subjects
QUANTITATIVE research ,DEATH rate ,COMPUTED tomography ,PELVIC bones ,BONE physiology ,FORENSIC sciences - Abstract
Age estimation methods are often based on the age-related morphological changes of the auricular surface and the pubic bone. In this study, a mathematical approach to quantify these changes has been tested analyzing the curvature variation on 3D models from CT and laser scans. The sample consisted of the 24 Suchey-Brooks ( SB) pubic bone casts, 19 auricular surfaces from the Buckberry and Chamberlain ( BC) 'recording kit' and 98 pelvic bones from the Terry Collection (Smithsonian Institution). Strong and moderate correlations between phases and curvature were found in SB casts (ρ 0.60-0.93) and BC 'recording kit' (ρ 0.47-0.75), moderate and weak correlations in the Terry Collection bones (pubic bones: ρ 0.29-0.51, auricular surfaces: ρ 0.33-0.50) but associated with large individual variability and overlap of curvature values between adjacent decades. The new procedure, requiring no expert judgment from the operator, achieved similar correlations that can be found in the classic methods. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
5. Surface Curvature of Pelvic Joints from Three Laser Scanners: Separating Anatomy from Measurement Error.
- Author
-
Villa, Chiara, Gaudio, Daniel, Cattaneo, Cristina, Buckberry, Jo, Wilson, Andrew S., and Lynnerup, Niels
- Subjects
FORENSIC sciences ,FORENSIC anthropology ,PELVIC bones ,OPTICAL scanners ,PUBIC symphysis ,CURVATURE ,SURFACE area - Abstract
Recent studies have reported that quantifying symphyseal and auricular surface curvature changes on 3D models acquired by laser scanners has a potential for age estimation. However, no tests have been carried out to evaluate the repeatability of the results between different laser scanners. 3D models of the two pelvic joints were generated using three laser scanners (Custom, Faro, and Minolta). The surface curvature, the surface area, and the distance between co-registered meshes were investigated. Close results were found for surface areas (differences between 0.3% and 2.4%) and for distance deviations (average <20 μm, SD <200 μm). The curvature values were found to be systematically biased between different laser scanners, but still showing similar trends with increasing phases/scores. Applying a smoothing factor to the 3D models, it was possible to separate anatomy from the measurement error of each instrument, so that similar curvature values could be obtained ( p < 0.05) independent of the specific laser scanner. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
6. The Use of CT Scans in Estimating Age at Death by Examining the Extent of Ectocranial Suture Closure.
- Author
-
Boyd, Kristen Leigh, Villa, Chiara, and Lynnerup, Niels
- Subjects
FORENSIC sciences ,FORENSIC anthropology ,AGE determination of animals ,COMPUTED tomography ,CRANIAL sutures - Abstract
We examined the utility of CT scans in the evaluation of degree of ectocranial suture closure. Five cranial points (left and right midcoronal positions, left and right midlambdoidal positions, and the lambda) were evaluated in 231 CT scans using a three-point scoring system (open, partial closed, and closed). The slice increment and thickness varied between three groups of the scans. The results showed a good correlation between degree of suture closure and increasing age in each group. Young individuals (<40 years) and old individuals (>60 years) could be clearly distinguished from the middle-aged individuals. ANOVA test revealed no difference between two groups of scans and between left and right sides ( p > 0.05). Interobserver agreement was good, especially considering the score by sides. The results of this study create the base for developing a robust and simple method to estimate the age at death using CT scans. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
7. Influence of Velocity on Variability in Gait Kinematics: Implications for Recognition in Forensic Science.
- Author
-
Yang, Sylvia X. M., Larsen, Peter K., Alkjær, Tine, Lynnerup, Niels, and Simonsen, Erik B.
- Subjects
CLOSED-circuit television ,GAIT in humans ,VELOCITY ,CRIME ,FORENSIC sciences ,HUMAN fingerprints - Abstract
Closed circuit television ( CCTV) footage is often available from crime scenes and may be used to compare perpetrators with suspects. Usually, the footage comprises incomplete gait cycles at different velocities, making gait pattern identification from crimes difficult. This study investigated the concurrence of joint angles throughout a gait cycle at three different velocities (3.0, 4.5, 6.0 km/h). Six datasets at each velocity were collected from 16 men. A variability range VR throughout the gait cycle at each velocity for each joint angle for each person was calculated. The joint angles at each velocity were compared pairwise, and whenever this showed values within the VR of this velocity, the case was positive. By adding the positives throughout the gait cycle, phases with high and low concurrences were located; peak concurrence was observed at mid-stance phase. Striving for the same velocity for the suspect and perpetrator is recommended. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
8. Variability and Similarity of Gait as Evaluated by Joint Angles: Implications for Forensic Gait Analysis.
- Author
-
Yang, Sylvia X.M., Larsen, Peter K., Alkjær, Tine, Simonsen, Erik B., and Lynnerup, Niels
- Subjects
GAIT disorders ,BIOMETRIC identification ,CLOSED-circuit television ,CRIMINAL investigation ,FORENSIC anthropology ,FORENSIC sciences ,DIAGNOSIS - Abstract
Closed-circuit television (CCTV) footage is used in criminal investigations to compare perpetrators with suspects. Usually, incomplete gait cycles are collected, making evidential gait analysis challenging. This study aimed to analyze the discriminatory power of joint angles throughout a gait cycle. Six sets from 12 men were collected. For each man, a variability range VR (mean ± 1 SD) of a specific joint angle at a specific time point (a gait cycle was 100 time points) was calculated. In turn, each individual was compared with the 11 others, and whenever 1 of these 11 had a value within this individual's VR, it counted as positive. By adding the positives throughout the gait cycle, we created simple bar graphs; tall bars indicated a small discriminatory power, short bars indicated a larger one. The highest discriminatory power was at time points 60-80 in the gait cycle. We show how our data can assess gait data from an actual case. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
9. Photogrammetric Documentation of Regions of Interest at Autopsy-A Pilot Study.
- Author
-
Slot, Liselott, Larsen, Peter K., and Lynnerup, Niels
- Subjects
PHOTOGRAMMETRY ,DOCUMENTATION ,AUTOPSY ,PHYSICAL measurements ,FORENSIC pathology ,HUMAN body - Abstract
In this pilot study, the authors tested whether photogrammetry can replace or supplement physical measurements made during autopsies and, based on such measurements, whether virtual computer models may be applicable in forensic reconstructions. Photogrammetric and physical measurements of markers denoting wounds on five volunteers were compared. Virtual models of the volunteers were made, and the precision of the markers' locations on the models was tested. Twelve of 13 mean differences between photogrammetric and physical measurements were below 1 cm, which indicates that the photogrammetric method has a high accuracy. The precision of the markers' location on the models was somewhat less, although the method is still promising and potentially superior to the current procedures used for reconstructions. The possibility to measure any distance on a body, even after the autopsy is concluded and the corpse is no longer available, is one of the biggest benefits of photogrammetry. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
10. The Lateral Angle Revisited: A Validation Study of the Reliability of the Lateral Angle Method for Sex Determination Using Computed Tomography ( CT),.
- Author
-
Morgan, Jennifer, Lynnerup, Niels, and Hoppa, Robert D.
- Subjects
- *
SEX determination of human remains , *TEMPORAL bone , *COMPUTED tomography , *AUTOPSY , *FORENSIC anthropology - Abstract
This article presents the results of a validation study of a previously published method of sex determination from the temporal bone. The purpose of this study was to evaluate the lateral angle method for the internal acoustic canal for accurately determining the sex of human skeletal remains using measurements taken from computed tomography ( CT) scans. Previous reports have observed that the lateral angle size in females is significantly larger than in males. The method was applied to an independent series of 77 postmortem CT scans (42 males, 35 females) to validate its accuracy and reliability. The mean lateral angle of the internal acoustic canal was found to be larger in females (46.5°) than in males (43.4°). However, the difference was not statistically significant and the sex differences reported in previous studies were not substantiated. In light of the observed results, the lateral angle method appears to be of minimal practical use in forensic anthropology and archeology. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
11. The Lateral Angle Revisited: A Validation Study of the Reliability of the Lateral Angle Method for Sex Determination Using Computed Tomography ( CT),.
- Author
-
Morgan, Jennifer, Lynnerup, Niels, and Hoppa, Robert D.
- Subjects
SEX determination of human remains ,TEMPORAL bone ,COMPUTED tomography ,AUTOPSY ,FORENSIC anthropology - Abstract
This article presents the results of a validation study of a previously published method of sex determination from the temporal bone. The purpose of this study was to evaluate the lateral angle method for the internal acoustic canal for accurately determining the sex of human skeletal remains using measurements taken from computed tomography ( CT) scans. Previous reports have observed that the lateral angle size in females is significantly larger than in males. The method was applied to an independent series of 77 postmortem CT scans (42 males, 35 females) to validate its accuracy and reliability. The mean lateral angle of the internal acoustic canal was found to be larger in females (46.5°) than in males (43.4°). However, the difference was not statistically significant and the sex differences reported in previous studies were not substantiated. In light of the observed results, the lateral angle method appears to be of minimal practical use in forensic anthropology and archeology. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
12. Variability of Bodily Measures of Normally Dressed People Using PhotoModeler® Pro 5.
- Author
-
Larsen, Peter K., Hansen, Lone, Simonsen, Erik B., and Lynnerup, Niels
- Subjects
FORENSIC sciences ,FORENSIC anthropology ,PHOTOGRAMMETRY ,BODY weight ,WEIGHTS & measures ,STATURE ,BODY size ,RANGE of motion of joints ,CRIMINALS ,TELEVISION in security systems - Abstract
Photogrammetry is used in forensic science to help identify perpetrators from crime scenes by way of surveillance video, but the reproducibility of manually locating hidden body-points such as the joints remains to be established. In this study, we quantified the inter- and intra-observer variability of bodily measures of clothed individuals in two different poses and examined whether body segment lengths could be used to distinguish between people of similar stature. Stature was reproduced within ±1.5 cm in both the intra- and inter-observer study. Segment lengths were best reproduced when flexion in the joints was present in the intra-observer study, but only the length of the trunk could be used to distinguish between people of similar height. The reproducibility between the two poses was low. Other measures than stature should be used with caution and with the perpetrator and suspect in the same pose. Consistent guidelines for locating body-points should be developed. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
13. Gait Analysis in Forensic Medicine.
- Author
-
Larsen, Peter K., Simonsen, Erik B., and Lynnerup, Niels
- Subjects
TELEVISION in security systems ,SECURITY systems ,GAIT disorders ,BIOCHEMISTRY ,PARAMETERS (Statistics) ,SURVEILLANCE radar ,KNEE ,HEEL bone ,ELECTRONIC surveillance - Abstract
Recordings from video surveillance systems are used as evidence from crime scenes. It would be useful to perform comparisons between disguised perpetrators and suspects based on their gait. We applied functional anatomical and biomechanical knowledge to analyze the gait of perpetrators, as recorded on surveillance video. Using a structured checklist, which addresses the single body segments during gait, we were able to give a statement concerning the gait patterns. Characteristic parameters were, e.g., varus instability in the knee at heel strike, and larger lateral flexion of the spinal column to one side than the other. Based on these characteristic features, we are able to state with reasonable certainty whether the suspect could be the perpetrator, but it is not possible to identify the perpetrator positively. Nevertheless, we have been involved in several cases where the court has found that this type of gait analysis was a valuable tool. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
14. Comparison of Handmarks in Manual Strangulation: An Experimental Study.
- Author
-
Kristensen, Mie E., Lynnerup, Niels, and Sejrsen, Birgitte
- Subjects
- *
HUMAN fingerprints , *FORENSIC sciences , *FORENSIC anthropology , *AUTOEROTIC asphyxia , *LABORATORIES , *ANTHROPOMETRY - Abstract
A police case with a strangulated woman with fingermarks on the neck and two suspects identifying each other as the perpetrator set off a laboratory experiment. Twenty-one males participated in the study. Blue paint was applied to their fingers, after which they grasped a neck dummy and pressed hard as if strangulating someone. The imprint was removed from the dummy, and their hands were photographed. Five imprints were randomly chosen and superimposed on the hand photographs in blind trials. In no cases did we match an imprint to the correct hand. However, in four cases we matched the imprint with several hands, one of which was the correct one. This means we were able to exclude nonmatches in 4/5 cases. Overall, matching of hands and fingermarks is difficult and inconclusive. Objective criteria for matching are difficult to establish, and matching is probably best suited for cases with specific anatomical features. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
15. Person Identification by Gait Analysis and Photogrammetry.
- Author
-
Lynnerup, Niels and Vedel, Jens
- Subjects
- *
COMPUTER software , *FORENSIC sciences , *CRIMINAL investigation , *FORENSIC anthropology , *IMAGE analysis , *IDENTIFICATION - Abstract
Presents a study on the use of gait analysis and photogrammetry in person identification. Analysis and comparison of surveillance images from a bank robbery with images of suspect; Comparison of images of the suspect with the perpetrator in order to note bodily features and proportions that might indicate concordance as well as incongruity; Use of the computer software Photomodeler Pro in the study.
- Published
- 2005
- Full Text
- View/download PDF
16. Third molar development in a contemporary Danish 13-25year old population.
- Author
-
Arge, Sara, Boldsen, Jesper Lier, Wenzel, Ann, Holmstrup, Palle, Jensen, Niels Dyrgaard, and Lynnerup, Niels
- Subjects
- *
DENTITION , *THIRD molars , *DATABASES , *CHRONOLOGY , *FORENSIC dentistry - Abstract
We present a reference database for third molar development based on a contemporary Danish population. A total of 1302 digital panoramic images were evaluated. The images were taken at a known chronological age, ranging from 13 to 25years. Third molar development was scored according to the Köhler modification of the 10-stage method of Gleiser and Hunt. We found that third molar development was generally advanced in the maxilla compared to the mandible and in males compared to females; in addition, the mandibular third molar mesial roots were generally more advanced in development than were the distal roots. There was no difference in third molar development between the left and right side of the jaws. Establishing global and robust databases on dental development is crucial for further development of forensic methods to evaluate age. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
17. Height estimations based on eye measurements throughout a gait cycle.
- Author
-
Yang, Sylvia X. M., Larsen, Peter K., Alkjær, Tine, Juul-Kristensen, Birgit, Simonsen, Erik B., and Lynnerup, Niels
- Subjects
- *
GAIT in humans , *EYE , *FORENSIC sciences , *ANTHROPOMETRY , *CRIMINAL investigation , *GENETIC markers - Abstract
Anthropometric measurements (e.g. the height to the head, nose tip, eyes or shoulders) of a perpetrator based on video material may be used in criminal cases. However, several height measurements may be difficult to assess as the perpetrators may be disguised by clothes or headwear. The eye height (EH) measurement, on the other hand, is less prone to concealment. The purpose of the present study was to investigate: (1) how the eye height varies during the gait cycle, and (2) how the eye height changes with head position. The eyes were plotted manually in APAS for 16 test subjects during a complete gait cycle. The influence of head tilt on the EH was investigated in 20 healthy men. Markers were attached to the face and the subjects were instructed to stand relaxed, tilt their head to the right, to the left, forward and backward. The marker data for the right eye were used to calculate the EH. The respective deviation and SD from the relaxed standing EH and the EH in the Frankfurt plane, left tilted, right tilted, forward tilted and backward tilted, in addition to the corresponding head tilt angles were calculated. There was no correlation between the height of the subject and the maximum vertical displacement of the EH throughout the gait cycle nor between height of the subjects and the variation of the EH throughout the gait cycle. The average maximum vertical displacement for the test subject group was 4.76 cm (±1.56 cm). The average EH was lower when the subjects were standing in the relaxed position than in the Frankfurt plane. The average EH was higher in the relaxed position than when the subjects tilted their heads, except when they tilted their heads backwards. The subjects had a slightly larger range of motion to the right than to the left, which was not significant. The results of this study provide a range for eye height estimates and may be readily implemented in forensic case work. It can be used as a reference in height estimates in cases with height measurements based on time of the gait cycle and based on the degree of head tilt from video material. Our data also provide descriptive statistics which may be helpful when comparing eye height measurements of a perpetrator with one or more suspects. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
18. Transition analysis applied to third molar development in a Danish population.
- Author
-
Arge, Sara, Wenzel, Ann, Holmstrup, Palle, Jensen, Niels D., Lynnerup, Niels, and Boldsen, Jesper L.
- Subjects
- *
STATISTICAL models , *PROGRAMMING languages , *RADIOGRAPHS , *FORENSIC sciences , *DENTISTRY , *PANORAMIC radiography , *THIRD molars , *DENTAL maturity - Abstract
Introduction: Age assessment based on dental development is often requested in order to assess whether an individual is older or younger than 18 years of age. There are several statistical approaches to estimate age based upon third molar development. The aim of this study was to apply the principles of transition analysis (TA) to a Danish reference material and to evaluate whether it was indicated to include a model that allows for logistic non-linearity as opposed to applying a model only allowing for logistic linearity. For this we chose to use the generalized additive model (gam) and the generalized linear model (glm), respectively.Material and Method: A cross-sectional sample comprising 1302 panoramic radiographs of Danish subjects in the chronological age range of 13-25 years was included. All present third molars had been scored according to the 10-stage method of Gleiser and Hunt. Each transition from one stage to the subsequent stage was analyzed according to the statistical approach of TA and fitted with both the generalized linear model (glm) and the generalized additive model (gam). In order to assess whether gam or glm was more parsimonious for each transition individually, the Akaikon information criterion (AIC) was applied.Results: The results emphasized the importance of applying a statistical model that sufficiently captures the spread of the age estimate. The AIC values showed that some transitions were sufficiently described by glm whereas for others the gam curves fitted significantly better.Conclusion: We recommend that for an age assessment tool based on TA, both a fitting allowing for non-linearity and one allowing only for linearity should be included. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.