U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights

Repeated CT Scans May Be Protective
Published: November 07, 2011
Posted: January 12, 2012

Public concern about exposure to ionizing radiation includes the effects of medical diagnostic procedures that use radiation, such as x-ray computed tomography (CT) scans. DOE researchers at McMaster University are investigating the biological effects and adaptive responses induced by single and repeated CT scans in C57BL/6 mice. They found that mice exposed to a single CT scan exhibited transient genotoxicity, enhanced apoptosis (programmed cell death), and characteristics of radiation sensitization. Interestingly, exposure to repeated CT scans resulted in small, but significant reductions in these effects. The repeated CT scan protocol also reduced the effects of subsequent larger radiation exposures in the animals. Results from repeated CT scans support the notion that frequent mild levels of oxidative stress allow for the maintenance of a healthy cell population by fostering the death of unstable and damaged cells. Parallel studies of similarly irradiated groups of mice are now underway to measure whether the different exposure protocols affect lifetime cancer risk.

Reference: Phan, N., M. De Lisio, G. Parise, and D. R. Boreham. 2011. "Biological Effects and Adaptive Response from Single and Repeated Computed Tomography Scans in Reticulocytes and Bone Marrow of C57BL/6 Mice," Radiation Research. DOI: 10.1667/RR2532.1. (Reference link)

Contact: Noelle Metting, SC-23.2, (301) 903-8309
Topic Areas:

  • Legacy: Low Dose Radiation, Radiobiology

Division: SC-23.2 Biological Systems Science Division, BER


BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

May 10, 2019
Quantifying Decision Uncertainty in Water Management via a Coupled Agent-Based Model
Considering risk perception can improve the representation of human decision-making processes in age [more...]

May 09, 2019
Projecting Global Urban Area Growth Through 2100 Based on Historical Time Series Data and Future Scenarios
Study provides country-specific urban area growth models and the first dataset on country-level urba [more...]

May 05, 2019
Calibrating Building Energy Demand Models to Refine Long-Term Energy Planning
A new, flexible calibration approach improved model accuracy in capturing year-to-year changes in bu [more...]

May 03, 2019
Calibration and Uncertainty Analysis of Demeter for Better Downscaling of Global Land Use and Land Cover Projections
Researchers improved the Demeter model’s performance by calibrating key parameters and establi [more...]

Apr 22, 2019
Representation of U.S. Warm Temperature Extremes in Global Climate Model Ensembles
Representation of warm temperature events varies considerably among global climate models, which has [more...]

List all highlights (possible long download time)