Narrow your search

Library

KU Leuven (2)


Resource type

dissertation (2)


Language

English (2)


Year
From To Submit

2020 (1)

2019 (1)

Listing 1 - 2 of 2
Sort by

Dissertation
Potential of Temporomadibular Joint measures ob CBCTs fo human identification
Authors: --- ---
Year: 2019 Publisher: Leuven KU Leuven. Faculteit Geneeskunde

Loading...
Export citation

Choose an application

Bookmark

Abstract

Objectives: specific morphologic aspects of the temporomandibular joint (TMJ) on CBCT could be considered as an identifier for human identification. The aim of the current study was to quantify the potential of specific measures from TMJ on CBCT images, separate or combined, for subject identification. Methods: CBCTs of TMJ of 198 Slavic and Eastern origin patients were examined to find out which parameters of the joint were potential identifiers. Evaluation of parameters was performed using ICATVision and GIMP software. One representative slice where measurements were performed, for both planes, was chosen. Afterwards, nine landmarks on sagittal and 6 landmarks of frontal planes, for right and left sides simultaneously, were established. Width, height, length of TMJ were measured between the landmarks. Also, two angles were allocated. In total, 14 parameters were measured on the sagittal plane and 4 on the frontal plane. Whereupon, statistical analysis was done. At first step; sex and side were analyzed separately (univariate analysis) to find out if there is a significant difference between the left and right side and significant difference between males and females. In the next step; interaction between sex and sides were evaluated (multivariate analysis). Results: Periost density showed to be the most unique single measurement. The side of the joint does not make difference for the identifying purposes.There is no significant difference between right and left sides, however, there is a considerable (p<0,0001) impact of sex on some of the variables. When it comes for a combination of the variables, the most unique patterns of identifiers (12,12%) showed 26 parameters together. Conclusion: Considering discussed outcomes, the present study indicated the possibility for obtaining information from morphologic identifiers like TMJ. By combining 26 parameters of the joint it is possible to garner additional information which can be used for identification purposes in forensic practise.

Keywords


Dissertation
Postmortem bone marrow quantification based on full body CT's

Loading...
Export citation

Choose an application

Bookmark

Abstract

Background: Bone Marrow is well known to change with age, resulting in the conversion of red marrow to yellow123. Starting from the distal parts of the bones the conversion taking place towards the center. Active, red bone marrow is being replaced with nonhematopoietic cells, adipocytes. This is a constant process throughout life. Material and methods: We performed full-body postmortem CT scans analysis to quantify these changes. 116 scans were obtained in total, 61 Male and 55 Female. Manual delineations of the femur head, lumbar vertebrae, and the iliac crest were done in line with semi-automated whole-body skeleton segmentation to detect and calculate the changes. The skeleton segmentation was done by three segments: head, thorax and arms, and the lower limbs. Results: Strong correlation (p<0.05) was found between the density, volume of bone marrow, and age in all examined bone sites, excluding the volume of the iliac crest, probably due to the small size of the region. Postmortem interval did not show any significant effect on the density or volume of the bone. Meaningful difference was also discovered between sexes (p<0.05). Generally, men had more compact bone marrow until the age of 80, when the values for both sexes becomes equal. With the semi-automated method, the discrepancy between the age and sexes was visualized. Women from 20 to 40 years old tend to have the highest density of the bones. Moreover, the analysis showed skull to be the densest region of the body within all ages. Conclusion: Our results nicely correlated with the previous findings, proving the usage of CT modality for such purposes, providing potential workflow for age estimation. Further goal based on the present study would be to create a fully automated method of segmenting exclusively the bone marrow, which will significantly contribute to the forensic field.

Keywords

Listing 1 - 2 of 2
Sort by


Copyright ©2025 SemperTool