Next generation coronary CT angiography: in vitro evaluation of 27 coronary stents

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. 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. 0A degrees) and in an orientation of 90A degrees 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 x 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. Mean visible stent lumen of stents with 3.0 mm diameter ranged from 53.3 % (IQR 48.9 -aEuro parts per thousand 56.7 %) to 73.9 % (66.7 -aEuro parts per thousand 76.7 %), depending on the kernel used at 0A degrees, and was highest at an orientation of 90A degrees with 80.0 % (75.6 -aEuro parts per thousand 82.8 %) using the Bv59 kernel, strength 4. Visible stent lumen declined with decreasing stent size. Use of third-generation dual-source CT enables stent lumen visibility of up to 80 % in metal stents and 100 % in bioresorbable stents. aEuro cent Blooming artefacts impair in-stent lumen visibility of coronary stents in CT angiography. aEuro cent CT enables stent lumen visibility of up to 80 % in metal stents. aEuro cent Stent lumen visibility varies with stent orientation and size. aEuro cent CT angiography may be a valid alternative for detecting in-stent restenosis.