Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

An Automatic System for Matching Dental Records

22.09.2003


The ADIS must match this pair of x-rays. The teeth match, but the images are flipped [and different how else, if any?].
Credit: Robert M. Howell, DDS


In its most significant challenge, the ADIS must be able to match x-ray pairs in which one image shows the same teeth at a different angle, as in this pair of matching x-rays.
Credit: Robert M. Howell, DDS


By matching bicuspid to bicuspid and filling to filling, forensic investigators use dental records to give a John or Jane Doe a real name. Researchers from West Virginia University, Michigan State University and the University of Miami are combining advanced image-processing techniques with elements of logic to accelerate and improve the accuracy of identity matches.

The researchers are working on an Automated Dental Identification System (ADIS) that will compare a database of dental x-rays with x-rays of an unidentified victim. Currently, the FBI’s National Crime Information Center uses a text-based database with manually coded descriptions of an individual’s teeth and jaw.

Supported by a National Science Foundation Digital Government award, the team is led by West Virginia University computer science professor Hany Ammar and includes professors Robert Howell at West Virginia, Anil Jain at Michigan State and Mohamed Abdel-Mottaleb at Miami, as well as FBI collaborators in the Criminal Justice Information Services division.



By using x-ray images directly, the system keeps the fine-grained details that are lost when humans do the coding and can spot underlying image structures that are difficult to assess by eye. Still, image-based searching presents new challenges. Most significantly, an x-ray image is affected by the position of the camera with respect to the head, unlike fingerprints inked directly onto a sheet of paper.

“There are ways to standardize the angle at which an x-ray is taken, but they are complicated and not all dentists’ offices would be able to apply them,” said team member Robert Howell, a professor of oral pathology at West Virginia. Central to ADIS is evaluation of the computer science techniques available for aligning images taken at different angles.

In addition, ADIS must apply a certain amount of expert logic. For example, ADIS has to understand, to some degree, which types of restorations—fillings, crowns and the like—could logically have happened since an earlier x-ray and which would be impossible. For example, a missing tooth cannot reappear in a later x-ray, but a broken tooth in an early x-ray could have been repaired or crowned.

From a large database of dental x-rays, ADIS will produce a short list of a few possible matches with a minimum of human intervention. The results will either contain the matching case or correctly return no matches when no match exists, with an error tolerance comparable to that of FBI’s fingerprint matching system. Human investigators will still make the final comparisons against the short match list.

NSF Media Contact: David Hart, 703-292-7737, dhart@nsf.gov

NSF Digitial Government Program: http://www.digitalgovernment.org/

NSF Program Officer: Lawrence Brandt, 703-292-8980, lbrandt@nsf.gov
Principal Investigator: Hany Ammar, 304-293-0405 x2514, hany.ammar@mail.wvu.edu
Robert Howell, 304-293-2671, howell@hsc.wvu.edu

David Hart | NSF
Further information:
http://www.nsf.gov/od/lpa/news/03/tip030922.htm#first
http://www.digitalgovernment.org/

More articles from Health and Medicine:

nachricht Fast-tracking T cell therapies with immune-mimicking biomaterials
16.01.2018 | Wyss Institute for Biologically Inspired Engineering at Harvard

nachricht Dengue takes low and slow approach to replication
12.01.2018 | Duke University

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: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

White graphene makes ceramics multifunctional

16.01.2018 | Materials Sciences

Breaking bad metals with neutrons

16.01.2018 | Materials Sciences

ISFH-CalTeC is “designated test centre” for the confirmation of solar cell world records

16.01.2018 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>