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Summation of CT Scans Simplifies Probe Repositioning During Radiofrequency Ablation LEESBURG, Va -- September 4, 2008 -- Merging multiple CT images increases the accuracy of probe repositioning during radiofrequency ablation treatments of various lesions, according to a study in the September issue of the American Journal of Roentgenology. "During radiofrequency ablation the probe often needs to be repositioned in order to effectively treat an entire lesion," said author John M. Gemery, MD, Department of Radiology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire. "During radiofrequency ablation it is hard to determine the areas that have already been treated when moving the probe around. Looking at summated images of several CT scans allows one to quickly check where the ablation probe has been." There have been 40 patients successfully treated using the summation method. According to Dr. Gemery, probe repositioning has most commonly been used on patients who have lesions within the liver and kidneys, but it has also been used on lesions found in the lungs and bones. "The summation method allows for 3 or more probe placements to be seen at one time. It is very easy to use and it is helpful. It gives you a rapid and accurate picture of where the lesion has been treated," said Dr. Gemery. "On a single slice scanner it takes about 30 seconds to summate CT scans of different probe placements into a single set of images. On modern scanners with more powerful computers summation is even quicker." SOURCE: The American Roentgen Ray Society E-mail this page to a friend or colleague! To print, use this version