Adaptive Statistical Iterative Reconstruction: Assessment of Image Noise and Image Quality in Coronary CT Angiography

• DOI: 10.2214/ajr.10.4285
• Publication Date: 2010-08-20T18:35:19Z
• Authors: Jonathon Leipsic; Troy M. LaBounty; Brett Heilbron; James K. Min; G. B. John Mancini; Fay Y. Lin; Carolyn Taylor; Allison Dunning; James P. Earls
• Keywords: Image noise; Statistical noise

The purpose of our study was to determine the effect Adaptive Statistical Iterative Reconstruction (ASIR) on cardiac CT angiography (CTA) signal, noise, and image quality.We evaluated 62 consecutive patients at three sites who underwent clinically indicated CTA using an ASIR-capable 64-MDCT scanner a low-dose technique. Studies were reconstructed filtered back projection (FBP), ASIR-FBP composites 20-80% ASIR, 100% ASIR. signal noise measured in aortic root each four coronary arteries. Two blinded readers graded quality 5-point Likert scale determined proportion interpretable segments. All segments included for analysis regardless size.In comparison with FBP (0% ASIR), use 20%, 40%, 60%, 80%, ASIR resulted reduced between groups (-7%, -17%, -26%, -35%, -43%, respectively; p < 0.001) without difference (p = 0.60). There significant differences (0%, ASIR) scores (1.5, 2.1, 3.7, 3.8, 2.0, 1.1, (88.7%, 89.3%, 90.5%, 90.4%, 88.0%, 87.3%, 0.001). 40% 60% had highest largest In FBP, associated higher increased 0.001 all).ASIR reduction significantly impacted quality. When low tube current technique, reconstruction or improved compared reconstruction.