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Coronary CTA With ASIR Can Reduce Risk Of Radiation Exposure By 27%.

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Using the new coronary CTA (CT Angiography) image enhancement technique called adaptive statistical iterative reconstruction (ASIR) can reduce the risk of radiation exposure by 27%, as reported by a new study published in the September issue of the American Journal of Roentgenology (AJR), titled “Adaptive Statistical Iterative Reconstruction: Assessment of Image Noise and Image Quality in Coronary CT Angiography”.

The study compared more than 500 patients examined with CTA using filtered back projection (FBP) and coronary CTA using ASIR. FBP emitted a radiation dose of 4.1 mSv while ASIR emitted 2.3 mSv only, so there is 27% reduction of the radiation dose. The ASIR technique is primarily developed to be an image noise reduction technique. Beside reducing the risk of radiation exposure, two blinded experts graded image quality of the CTA exams on a 5-point Likert scale, and the ASIR images gained a higher Likert score. Jonathon Leipsic, MD, lead author of the study, said in a press statement, “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.”

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