Ling-Ling Gu, Abstract Co-Author: Nothing to Disclose

Hong Yu MD, PhD, Abstract Co-Author: Nothing to Disclose

Shiyuan Liu PhD, Abstract Co-Author: Nothing to Disclose

Yan Jiang MD, Presenter: Employee, Koninklijke Philips NV

To evaluate the benefit of knowledge based iterative reconstruction (IMR, Philips Healthcare) for coronary CT angiography in patients with coronary stents.

23 patients with 19 coronary stents were studied with a retrospective ECG-gated helical technique using 256-MDCT scanner. Image data were reconstructed with both FBP and IMR techniques. Image quality (IQ) and diagnostic confidence (DC)were evaluated by two radiologists blindly using a three-point scale (1[poor] to 3 [excellent]), the results and in-stent assessable lumen, artificial lumen narrowing were compared between IMR and FBP reconstructions using paired-t test. Artificial lumen narrowing = (nominal stent diameter - visible lumen diameter) / nominal stent diameter.

Image quality was significantly better for IMR images compared to FBP images (2.14±0.65 vs 1.71±0.46; P<0.01). In-stent assessable lumen measured on IMR images were larger than those measured on FBP images (2.46±0.60mm vs 2.16±0.62mm,p=0.01).Artificial lumen narrowing was reduced by IMR versus FBP(24.7±10.0 vs 34.3±9.4,p<0.01)

IMR improves image quality and diagnostic confidence of coronary CT angiography in patients with stents, and contributes to a more accurate assessment of the in-stent lumen.

IMR improves image quality and diagnostic confidence of coronary CT angiography in patients with stents, and contributes to a more accurate assessment of the in-stent lumen.

Gu, L, Yu, H, Liu, S, Jiang, Y, Evaluation of Coronary Stents with Coronary CT Angiography: Comparison of Knowledge Based Iterative Reconstruction and Filtered Back Projection (FBP) Techniques.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14016122.html