5thEuropeanIABPAconferenceFinal programm
5thEuropeanIABPAconferenceFinal programm
5thEuropeanIABPAconferenceFinal programm
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
The 5 th European<br />
Internaonal Associaon<br />
of Bloodstain Paern Analysts<br />
(IABPA) Conference<br />
Rome 2015<br />
50 shades of red:blood stain age estimation<br />
using hyperspectral imaging<br />
Gerda Edelman ‐ NFI<br />
Abstract<br />
The red appearance of blood is due to<br />
the absorption properties of oxygenated<br />
hemoglobin. After blood leaves the body<br />
circulation, its color changes from bright<br />
red to dark brown. When measured<br />
quantitatively using hyperspectral imaging,<br />
this color change can be used to<br />
estimate the age of blood stains. By<br />
analysing the reflectance spectra of<br />
blood stains, we are able to determine<br />
the concentration change of oxyhemoglobin,<br />
methemoglobin and hemichrome<br />
- all reaction products of hemoglobin.<br />
The relative amount of these hemoglobin<br />
derivatives can in turn be used to<br />
calculate the age blood, without destroying<br />
or even touching the stain. We<br />
evaluated this method in the laboratory<br />
and studied the influence of environmental<br />
circumstances, human variability<br />
and colored substrates on the results.<br />
Recently, a new custom-made hyperspectral<br />
camera was developed to perform<br />
measurements at the crime scene.<br />
This camera will be demonstrated in a<br />
workshop. The theoretical background<br />
will be explained in this talk.<br />
Biography<br />
Gerda Edelman is a scientist specialized in forensic<br />
applications of hyperspectral imaging.<br />
She was part of a research group at the Academic<br />
Medical Center (AMC) in Amsterdam who<br />
developed a method for the age estimation of<br />
blood stains using hyperspectral imaging. In<br />
2014, she successfully defended her PhD research<br />
on the spectral analysis of blood stains<br />
at the crime scene. Gerda Edelman is currently<br />
employed as a researcher within the Mobile<br />
Forensic Team of the Netherlands Forensic Institute<br />
(NFI). Her role is to improve existing,<br />
and develop new, innovative techniques to be<br />
used by her crime scene investigation colleagues<br />
in the field. Together with the AMC,<br />
she is currently validating the technique for<br />
bloodstain age estimation to make it applicable<br />
in forensic casework<br />
58
Change language