A new study published in the September issue of the American Journal of Roentgenology (AJR) shows that a new coronary CTA image enhancement technique called adaptive statistical iterative reconstruction (ASIR) can reduce radiation exposure by 27%.

The study compared over 500 patients screened with CTA using filtered back projection (FBP) and coronary CTA using ASIR. FBP emitted a radiation dose of 4.1 mSv compared to 2.3 mSv for ASIR, a 27% reduction.

The ASIR technique is actually designed as an image noise reduction technique. In addition to showing lower radiation, two blindedreaders graded image quality of the CTA exams on a 5-point Likert scale, and the ASIR images received a higher Likert score.

Jonathon Leipsic, MD, lead author of the study, commented 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.”

The study is titled “Adaptive Statistical Iterative Reconstruction: Assessment of Image Noise and Image Quality in Coronary CT Angiography” and authored by Leipsic, LaBounty, Heilbron, et al.

You can read the abstract and study online on the AJR website.

(Source: Press Release and Abstract)