“Estimating the risks associated with ionizing radiation is complex,” said James Koonce, M.D., lead author of the study. “Many variables such as patient size, age, and the region of the body being imaged all effect the total risk. Our study looked at how the overall risks associated with abdominal/pelvic CT scans depend on patient sex and age,” stated Dr. Koonce.

The study, performed at the Medical University of South Carolina (Charleston, SC, USA) included 51 patients who underwent routine contrast-enhanced abdominal and pelvic CT examinations. “We found that the estimated radiation risk for a 31-year-old [0.91 per 1,000] was about double that for a 74-year-old [0.47 per 1,000]. The median radiation risk to 25 males was 0.61 per 1,000 and for 26 females was 0.74 per 1,000,” said Dr. Koonce.

The study was presented May 3, 2010, at the American Roentgen Ray Society (ARRS) 2010 annual meeting, held in San Diego, CA, USA. “Clinicians ordering imaging tests must use their best clinical judgment to select patients with a reasonable pre-test probability that the diagnosis afforded by CT will give valuable information to effect patient management. Knowing the risk involved with radiation exposure to a patient during an abdominal/pelvic CT allows for more accurate risk benefit evaluation when a physician is deciding whether or not to order an exam,” concluded Dr. Koonce.

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Medical University of South Carolina