Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Yellow Dates Bruising

04.11.2004


Optical technology can give the answer to when bruising happened and how. This can be important for cases of violent crime.

In court, a bruise can sometimes be important evidence. And the age of the bruise can be instrumental if a person is to be charged for the injuries in a crime. A cross-functional research team with the Norwegian University of Scence and Technology (NTNU) is currently developing a method, based on optical technology, for dating bruises. The method will be quick and inexpensive. It does not involve incision in the body, and it would provide a reasonably accurate measurement of bruise’s age.

Today, a bruise’s age is decided by the naked eye. The method is subjective, based on the coroner’s personal knowledge and experience. It is, however, impossible to decide exactly the age of the bruise. The dating will therefore be very approximate. International research shows that coroners date approximately every second bruise incorrectly, and that the margin of error can be up to a week. The bruises are divided into three categories: The fresh that have occured in the last one to two days, bruises that are a “few days old”, and bruising that occured “several days ago”. Technology that is more accurate in determining the age of the skin bruises will in some cases be of importance to the outcome of a trial.



A bruise lasts from one to two weeks. At first it tends to be reddish, then blue-violet, then green, yellow and finally brownish. Researchers use the natural breakdown of the red-coloured material in the blood, haemoglobin, to find the age of the bruise. After a few days, the haemoglobin breaks down into other chemical combinations – that have other colours. “It is the yellow coloured material, bilirubin, that we measure the amount of,” explains project leader Lise Lyngsnes Randeberg at NTNU.

-The naked eye will not perceive this colour until after about two days, while with reflection spectropy we reveal bilirubin after about one day. After about four days the bilirubin amount in the bruise is at its maximum, and afterwards gradually decreases.” The theoretical base for the technology has been developed by Professor Lars Svaasand. The technology is in principle simple: a lamp sends out a white light towards the bruise. White light contains all the colours of the rainbow. The light that reflects from the skin is measured with a spectrometer. More precisely, the spectrometer measures how much of the different colours are reflected back. This will show how far along the bruise has come in its path. From the reflected light, the researchers can measure the amount of blood in the bruise and the oxygen in the blood. Based on these factors, Randeberg is developing an algorithm that will be the key to analysing bruises.

It is possible that bruise technology can be used in several areas. Researchers say that this may come to be used to determine more precisely the time of a victim’s death. International firms in medical technology find this research very interesting, and the team hopes that in a few years the technological results of their work will be common in, among other places, hospital emergency rooms.

Lise Randeberg | alfa
Further information:
http://www.ime.ntnu.no/eng/

More articles from Health and Medicine:

nachricht World first: Massive thrombosis removed during early pregnancy
20.07.2017 | Universitätsspital Bern

nachricht Therapy of preterm birth in sight?
19.07.2017 | Universitätsspital Bern

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

Im Focus: On the way to a biological alternative

A bacterial enzyme enables reactions that open up alternatives to key industrial chemical processes

The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....

Im Focus: The 1 trillion tonne iceberg

Larsen C Ice Shelf rift finally breaks through

A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...

Im Focus: Laser-cooled ions contribute to better understanding of friction

Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision

Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

The technology with a feel for feelings

12.07.2017 | Event News

 
Latest News

NASA looks to solar eclipse to help understand Earth's energy system

21.07.2017 | Earth Sciences

Stanford researchers develop a new type of soft, growing robot

21.07.2017 | Power and Electrical Engineering

Vortex photons from electrons in circular motion

21.07.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>