CT Helps Identify Bullet Trajectories

OAK BROOK, Ill. — Multidetector computed tomography (MDCT) provides an efficient, effective way to analyze wounds from bullets and explosive devices, according to a study published online and in the March issue of Radiology.

"The information provided by MDCT has the potential to improve patient care and aid in both military and civilian forensic investigations," said the study's lead author, Les R. Folio, D.O., M.P.H., from the Uniformed Services University in Bethesda, Md.

U.S. troops stationed in Iraq and Afghanistan face threats from increased sniper activity and the use of improvised explosive devices. Current clinical reports of wounds from bullets and bomb fragments do not include the progression of the trajectory or the direction of the wound path, despite the fact that ballistic injuries are not necessarily confined to a single anatomic structure.

While research has shown the value of CT in the analysis of ballistic wound paths, there is no widely accepted method for consistently and accurately pinpointing wound paths and determining the trajectory angles.

For the study, researchers evaluated the accuracy of MDCT-based ballistic wound path identification. They had a marksman shoot six shots from a rifle into two simulated legs made from various synthetic materials to optimally represent real tissue. The legs were tilted at six different angles based on common sniper heights and distances.

After the leg phantoms were scanned with 64-channel MDCT, several radiologists independently reviewed the CT images and recorded entrance and exit sites for the bullet trajectories. The angles measured on MDCT corresponded closely with those calculated from coordinates with actual shooting angles. Dr. Folio and his team concluded that radiologists could estimate the location of a sniper or an explosive device by extrapolating trajectories identified on MDCT when other factors, such as sniper distance and the victim's position, are known.

source: RSNA