Automatic CT-based finite element model generation for temperature-based death time estimation: feasibility study and sensitivity analysis.
Int J Legal Med
; 131(3): 699-712, 2017 May.
Article
en En
| MEDLINE
| ID: mdl-28091724
ABSTRACT
Temperature-based death time estimation is based either on simple phenomenological models of corpse cooling or on detailed physical heat transfer models. The latter are much more complex but allow a higher accuracy of death time estimation, as in principle, all relevant cooling mechanisms can be taken into account.Here, a complete workflow for finite element-based cooling simulation is presented. The following steps are demonstrated on a CT phantom Computer tomography (CT) scan Segmentation of the CT images for thermodynamically relevant features of individual geometries and compilation in a geometric computer-aided design (CAD) model Conversion of the segmentation result into a finite element (FE) simulation model Computation of the model cooling curve (MOD) Calculation of the cooling time (CTE) For the first time in FE-based cooling time estimation, the steps from the CT image over segmentation to FE model generation are performed semi-automatically. The cooling time calculation results are compared to cooling measurements performed on the phantoms under controlled conditions. In this context, the method is validated using a CT phantom. Some of the phantoms' thermodynamic material parameters had to be determined via independent experiments.Moreover, the impact of geometry and material parameter uncertainties on the estimated cooling time is investigated by a sensitivity analysis.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Cambios Post Mortem
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Simulación por Computador
/
Análisis de Elementos Finitos
Tipo de estudio:
Diagnostic_studies
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Qualitative_research
Límite:
Humans
Idioma:
En
Revista:
Int J Legal Med
Asunto de la revista:
JURISPRUDENCIA
Año:
2017
Tipo del documento:
Article
País de afiliación:
Alemania