Optimized intravenous Flat Detector CT for non-invasive visualization of intracranial stents: first results
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Tobias Struffert & Stephan Kloska & Tobias Engelhorn & Yu Deuerling-Zheng & Sabine Ott & Marc Doelken & Marc Saake & Martin Kِhrmann & Arnd Doerfler
- چاپ و سال / کشور: 2010
Description
Objective As stents for treating intracranial atherosclerotic stenosis may develop in-stent re-stenosis (ISR) in up to 30%, follow-up imaging is mandatory. Residual stenosis (RS) is not rare. We evaluated an optimised Flat Detector CT protocol with intravenous contrast material application (i.v. FD-CTA) for non-invasive follow-up. Methods In 12 patients with intracranial stents, follow-up imaging was performed using i.v. FD-CTA. MPR, subtracted MIP and VRT reconstructions were used to correlate to intra-arterial angiography (DSA). Two neuroradiologists evaluated the images in anonymous consensus reading and calculated the ISR or RS. Correlation coefficients and a Wilcoxon test were used for statistical analysis. Results In 4 patients, no stenosis was detected. In 6 patients RS and in two cases ISR by intima hyperplasia perfectly visible onMPR reconstructions of i.v. FD-CTAwere detected. Wilcoxon’s test showed no significant differences between the methods (p>0.05). We found a high correlation with coefficients of the pairs DSA/ FD-CT MIP r=0.91, DSA/ FD-CT MPR r=0.82 and FD-CT MIP/ FD-CT MPR r=0.8. Conclusion Intravenous FD-CTA could clearly visualise the stent and the lumen, allowing ISR or RS to be recognised. FD-CTA provides a non-invasive depiction of intracranial stents and might replace DSA for non-invasive follow-up imaging.
Eur Radiol (2011) 21:411–418 DOI 10.1007/s00330-010-1931-3 Received: 23 May 2010 / Revised: 4 July 2010 / Accepted: 26 July 2010 / Published online: 14 August 2010
