ASIR technique reduces radiation dose associated with coronary CTA by 27 percent
A new low-dose coronary computed tomography angiography (CTA) technique called adaptive statistical iterative reconstruction (ASIR) can reduce the radiation dose associated with coronary CTA by 27 percent, according to a study in the September issue of the American Journal of Roentgenology (www.ajronline.org). Coronary CTA is a common heart imaging test that helps determine if fatty or calcium deposits have narrowed a patient's coronary arteries. ASIR is a technique that allows radiologists to reduce the noise in an image and improve image quality (like adjusting a TV antenna to make a "fuzzy" image sharper) while reducing the radiation dose.
The large multicenter study included 574 patients undergoing coronary CTA at three imaging centers. Comparisons were performed between consecutive groups initially using the standard CTA method using filtered back projection (FBP) and subsequently ASIR with regard to patient and scan characteristics, radiation dose, and diagnostic study quality.
"There was a 44 percent reduction in the median radiation dose between the FBP and ASIR cohorts (4.1 mSv vs. 2.3 mSv)," said Jonathon Leipsic, MD, lead author of the study. "After adjustment for scan settings, ASIR was associated with a 27 percent reduction in radiation dose compared with FBP," he said.
"Our study results show that ASIR permits reduction in tube current while imparting a statistically significant reduction in radiation dose due to the direct relationship between tube current and dose," said Leipsic.
"ASIR represents a novel method of radiation dose reduction that appears additive to existing techniques," he said.
- Iterative reconstruction technique significantly reduces patient radiation dose during CT scansWed, 19 Aug 2009, 7:22:19 EDT
- ASIR technique significantly reduces already low radiation dose from CT colonographyMon, 21 Jun 2010, 13:37:12 EDT
- Modified technique significantly reduces radiation dose delivered during ECG-triggered coronary CTA examsTue, 23 Mar 2010, 12:08:28 EDT
- Radiation dose can be reduced for 'triple rule-out' coronary CT angiographyFri, 3 Apr 2009, 13:43:30 EDT
- Coronary CTA a cost-effective alternative to cardiac catheterization for the evaluation of CADWed, 21 Apr 2010, 16:07:26 EDT
Articles on the same topic
- ASIR technique significantly reduces radiation dose associated with abdominal CT scansFri, 20 Aug 2010, 13:08:35 EDT
- ASIR technique significantly reduces radiation dose associated with abdominal CT scansfrom PhysorgFri, 20 Aug 2010, 17:14:08 EDT
- ASIR technique reduces radiation dose associated with coronary CTA by 27 percentfrom PhysorgFri, 20 Aug 2010, 13:07:09 EDT
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