Kenneth K. Lau, Presenter: Nothing to Disclose

Nicholas David Ardley, Abstract Co-Author: Nothing to Disclose

Kevin Buchan, Abstract Co-Author: Employee, Koninklijke Philips NV

Theodore Lau, Abstract Co-Author: Nothing to Disclose

CT abdominal angiography (CTA) plays a vital role in diagnosing and monitoring conditions such as stenosis, occlusion, thrombo-embolism, aneurysm, dissection, endoleak and gastrointestinal bleed. Its advantages in comparison to digital subtraction angiography (DSA) are shorter acquisition time, non-invasive nature and less procedural complications. Vessel wall calcification may cause beam-hardening artifact that obscures the vessel lumen. The latest Iterative model reconstruction (IMR) is a knowledge-based algorithm that improves low contrast resolution, reduces image noise and artifact. The aim of this exhibit is to assess the diagnostic utility of IMR in CTA.

The data sets of CTA of thoracic and abdominal aorta, pulmonary, renal, mesenteric arteries, carotid and cerebral arteries of 156 patients were reconstructed using IMR and iDose IRs. 1. The vessel contours and definitions were better visualized down to small vessel with IMR than iDose due to image noise reduction. 2. Less beam-hardening artifacts from vessel wall calcified plaques allow accurate luminal assessment. 3.The presence of embolism and dissection were better depicted on IMR CTA. IMR is superior to conventional iterative reconstruction and aids more accurate vascular pathology assessment .  

http://abstract.rsna.org/uploads/2014/14019026/14019026_snlw.pdf

Lau, K, Ardley, N, Buchan, K, Lau, T, Advanced Iterative Model Reconstruction in Improving Image Quality of CT Angiography.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14019026.html