Technique Drastically Reduces Patient Radiation Dose During CT Angiography

Forty patients were evaluated using retrospective gating and 40 more were evaluated using prospective gating. "In comparison, image quality was equivalent,” said W. Dennis Foley, M.D., lead author of the study. "In regards to radiation dose, the dose was three times higher with retrospective gating,” he said. The radiation dose using prospective gating was approximately 14 mSv compared to 43.3 mSv using retrospective gating. Radiation exposure continues to be a concern during CT procedures. However our study is significant because it shows radiologists are able to significantly decrease the radiation dose delivered to the patient during CT angiography.”

The study was published in the October 2009 issue of the American Journal of Roentgenology (AJR).

"Prospective ECG-gated CT angiography is a technically robust, noninvasive imaging technique for the evaluation of vascular disease. It is safer than conventional angiography and the patient benefits from having it done intravenously rather than through the arteries,” Dr. Foley concluded.

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