Cargando…

Bloodstain Pattern Analysis: implementation of a fluid dynamic model for position determination of victims

Bloodstain Pattern Analysis is a forensic discipline in which, among others, the position of victims can be determined at crime scenes on which blood has been shed. To determine where the blood source was investigators use a straight-line approximation for the trajectory, ignoring effects of gravity...

Descripción completa

Detalles Bibliográficos
Autores principales: Laan, Nick, de Bruin, Karla G., Slenter, Denise, Wilhelm, Julie, Jermy, Mark, Bonn, Daniel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4476491/
https://www.ncbi.nlm.nih.gov/pubmed/26099070
http://dx.doi.org/10.1038/srep11461
_version_ 1782377609612492800
author Laan, Nick
de Bruin, Karla G.
Slenter, Denise
Wilhelm, Julie
Jermy, Mark
Bonn, Daniel
author_facet Laan, Nick
de Bruin, Karla G.
Slenter, Denise
Wilhelm, Julie
Jermy, Mark
Bonn, Daniel
author_sort Laan, Nick
collection PubMed
description Bloodstain Pattern Analysis is a forensic discipline in which, among others, the position of victims can be determined at crime scenes on which blood has been shed. To determine where the blood source was investigators use a straight-line approximation for the trajectory, ignoring effects of gravity and drag and thus overestimating the height of the source. We determined how accurately the location of the origin can be estimated when including gravity and drag into the trajectory reconstruction. We created eight bloodstain patterns at one meter distance from the wall. The origin’s location was determined for each pattern with: the straight-line approximation, our method including gravity, and our method including both gravity and drag. The latter two methods require the volume and impact velocity of each bloodstain, which we are able to determine with a 3D scanner and advanced fluid dynamics, respectively. We conclude that by including gravity and drag in the trajectory calculation, the origin’s location can be determined roughly four times more accurately than with the straight-line approximation. Our study enables investigators to determine if the victim was sitting or standing, or it might be possible to connect wounds on the body to specific patterns, which is important for crime scene reconstruction.
format Online
Article
Text
id pubmed-4476491
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher Nature Publishing Group
record_format MEDLINE/PubMed
spelling pubmed-44764912015-06-24 Bloodstain Pattern Analysis: implementation of a fluid dynamic model for position determination of victims Laan, Nick de Bruin, Karla G. Slenter, Denise Wilhelm, Julie Jermy, Mark Bonn, Daniel Sci Rep Article Bloodstain Pattern Analysis is a forensic discipline in which, among others, the position of victims can be determined at crime scenes on which blood has been shed. To determine where the blood source was investigators use a straight-line approximation for the trajectory, ignoring effects of gravity and drag and thus overestimating the height of the source. We determined how accurately the location of the origin can be estimated when including gravity and drag into the trajectory reconstruction. We created eight bloodstain patterns at one meter distance from the wall. The origin’s location was determined for each pattern with: the straight-line approximation, our method including gravity, and our method including both gravity and drag. The latter two methods require the volume and impact velocity of each bloodstain, which we are able to determine with a 3D scanner and advanced fluid dynamics, respectively. We conclude that by including gravity and drag in the trajectory calculation, the origin’s location can be determined roughly four times more accurately than with the straight-line approximation. Our study enables investigators to determine if the victim was sitting or standing, or it might be possible to connect wounds on the body to specific patterns, which is important for crime scene reconstruction. Nature Publishing Group 2015-06-22 /pmc/articles/PMC4476491/ /pubmed/26099070 http://dx.doi.org/10.1038/srep11461 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Laan, Nick
de Bruin, Karla G.
Slenter, Denise
Wilhelm, Julie
Jermy, Mark
Bonn, Daniel
Bloodstain Pattern Analysis: implementation of a fluid dynamic model for position determination of victims
title Bloodstain Pattern Analysis: implementation of a fluid dynamic model for position determination of victims
title_full Bloodstain Pattern Analysis: implementation of a fluid dynamic model for position determination of victims
title_fullStr Bloodstain Pattern Analysis: implementation of a fluid dynamic model for position determination of victims
title_full_unstemmed Bloodstain Pattern Analysis: implementation of a fluid dynamic model for position determination of victims
title_short Bloodstain Pattern Analysis: implementation of a fluid dynamic model for position determination of victims
title_sort bloodstain pattern analysis: implementation of a fluid dynamic model for position determination of victims
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4476491/
https://www.ncbi.nlm.nih.gov/pubmed/26099070
http://dx.doi.org/10.1038/srep11461
work_keys_str_mv AT laannick bloodstainpatternanalysisimplementationofafluiddynamicmodelforpositiondeterminationofvictims
AT debruinkarlag bloodstainpatternanalysisimplementationofafluiddynamicmodelforpositiondeterminationofvictims
AT slenterdenise bloodstainpatternanalysisimplementationofafluiddynamicmodelforpositiondeterminationofvictims
AT wilhelmjulie bloodstainpatternanalysisimplementationofafluiddynamicmodelforpositiondeterminationofvictims
AT jermymark bloodstainpatternanalysisimplementationofafluiddynamicmodelforpositiondeterminationofvictims
AT bonndaniel bloodstainpatternanalysisimplementationofafluiddynamicmodelforpositiondeterminationofvictims