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Radiation Dose Reduced For Abdominal CT

reduction has moved to the forefront of importance in medical imaging with new techniques being developed in an effort to bring doses down as low as possible. What difference can these techniques make? Researchers at aimed to find out.

“We conducted a study to quantify , comparing two years’ worth of data and 11,458 abdomen and pelvic CT exams,” said Dr. , lead author of the study. Data on 5,707 consecutive CT abdomen and pelvis exams without or longitudinal dose modulation was collected. The data was compared to 5,750 exams in which both techniques were applied. “We saw a 23% total radiation in the second group,” said Dr. Rydberg. “If you consider that there are about 20 million abdominal CT examinations done each year in the U.S. a 23% translates into between 1,000 and 3,000 fewer radiation induced cancers each year, if we use the same assumptions used for survivors of Hiroshima and Nagasaki” he said.

Iterative reconstruction is a mathematical process that is an integral part of the CT scanner that allows for good quality images with lower , said Dr. Rydberg. Longitudinal dose modulation changes the radiation dose based on the density of the part of the body being imaged, he said.

Source

Dr. Rydberg presented his study at the ARRS annual meeting in Washington, DC.
American Roentgen Ray Society