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New Imaging Algorithm Reduces Cumulative Radiation Exposure: Digital Radiography

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Digital Radiography: A new imaging algorithm, used for helping radiologist in reducing cumulative radiation ct_scan_deviceexposure, was implemented recently in large healthcare facility. The new algorithm was used in CT angiography (CTA) and CT perfusion study conducted on patients with aneurysmal subarachnoid hemorrhages. The study was published in the July issue of the American Journal of Roentgenology.

The new algorithm helps physicians to determine the most appropriate time points at which to detect vasospasm with CTA and CT perfusion imaging. Vasospasm means contraction in a blood vessel leading to vasoconstriction. The study was carried out at the New York Presbyterian Hospital, Weill Cornell Medical Center, in New York, NY. The study involved 60 patients with aneurysmal subarachnoid hemorrhages. These patients were divided into 30 in the baseline group, (before implementation of the imaging algorithm), and 30 patients in the post-algorithm group. Michael L. Loftus, MD, lead author of the study ,said "With the new algorithm, the mean number of CT examinations per patient was 5.8 compared with 7.8 at baseline, representing a decrease of 25.6 percent," he added "The number of CT perfusion examinations per patient decreased 32.1 percent. Overall, there was a 12.1 percent decrease in cumulative radiation exposure,"

Dr. Loftus continued "Our results are promising, showing that guidelines for utilization of CT can lead to reduced radiation exposure of individual patients and the population. Our overall goal is to apply to other patient populations this concept of imaging algorithms as utilization guidelines for CT," he concluded "Application of these methods to other patient populations with the high use of CT may reduce cumulative radiation exposure while the clinical benefits of imaging are maintained,"


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