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Next generation coronary CT angiography: in vitro evaluation of 27 coronary stents
Ist Teil von
European radiology, 2014-11, Vol.24 (11), p.2953-2961
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2014
Quelle
SpringerLink
Beschreibungen/Notizen
Objectives
To evaluate in-stent lumen visibility of 27 modern and commonly used coronary stents (16 individual stent types, two stents at six different sizes each) utilising a third-generation dual-source CT system.
Methods
Stents were implanted in a plastic tube filled with contrast. Examinations were performed parallel to the system's z-axis for all stents (i.e. 0°) and in an orientation of 90° for stents with a diameter of 3.0 mm. Two stents were evaluated in different diameters (2.25 to 4.0 mm). Examinations were acquired with a collimation of 96 × 0.6 mm, tube voltage of 120 kVp with 340 mAs tube current. Evaluation was performed using a medium-soft (Bv40), a medium-sharp (Bv49) and a sharp (Bv59) convolution kernel optimised for vascular imaging.
Results
Mean visible stent lumen of stents with 3.0 mm diameter ranged from 53.3 % (IQR 48.9 − 56.7 %) to 73.9 % (66.7 − 76.7 %), depending on the kernel used at 0°, and was highest at an orientation of 90° with 80.0 % (75.6 − 82.8 %) using the Bv59 kernel, strength 4. Visible stent lumen declined with decreasing stent size.
Conclusions
Use of third-generation dual-source CT enables stent lumen visibility of up to 80 % in metal stents and 100 % in bioresorbable stents.
Key Points
•
Blooming artefacts impair in–stent lumen visibility of coronary stents in CT angiography.
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CT enables stent lumen visibility of up to 80 % in metal stents.
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Stent lumen visibility varies with stent orientation and size.
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CT angiography may be a valid alternative for detecting in-stent restenosis.