Coronary artery stent imaging using an integrated electronics detector and#br# different slice reconstructions: in vitro experience
1. Department of Radiology, the First Affiliated Hospital of China Medical University, Shenyang 110001, China;
2. Career Department, Siemens Healthcare CT, Shenyang 110001, China
Abstract：Objective: To assess the visualization improvement for different coronary stents especially ≤3 mm, using different image slice thickness reconstructed by integrated electronics. Methods: Eight different coronary stents with inner diameter of 3.5 mm, 3 mm and 2.5 mm were placed in plastic tubes filled with contrast agent(iohexol 350 mgI/mL) diluted with saline to make sure that the CT value of contrast was about 350 HU at 120 kVp. The whole phantom was then settled in an oil tank to mimic the pericardium fatty environment. All the CT scanning data was acquired using Siemens Definition Flash with a integrated electronics detector under prospective coronary CTA mode. Images were reconstructed into 0.5, 0.6 and 0.75 mm slice thickness. Two experienced radiologists blinded to each other evaluated the image quality, image noise, artificial lumen narrowing(ALN), lumial attenuation difference and attenuation-to-noise ratio(ANR). Results: Among the 3 groups, 0.5 mm images reconstructed were rated best for clearly showing the details of the stents and the inner-lumen situations(Kappa=0.797). The ALN value of 0.5 mm group was the lowest(40.69%±4.16%), and was superior to 0.6 and 0.75 mm groups(P=0.043, 0.018, P<0.05). But the differences of luminal attenuation and ANR among the three groups were not significant(P>0.05). With the increasing of the iterative reconstruction slice thickness, the image noise decreased, but the differences between 0.5 mm and 0.6 mm groups were not statistically significant(P>0.05). Conclusion: Stent visualization can be benefited from 0.5 mm slice thickness image for more accurate lumen narrowing assessment and lower image noise.
金士琪1，王彦懿1，杨 帆1，初金刚1，于 扬2，戴 旭1. 集成电子探测器联合迭代重建技术不同层厚重建对#br# 冠脉支架显示的影响：体外实验研究[J]. 中国临床医学影像杂志, 2016, 27(7): 467-470.
JIN Shi-qi1, WANG Yan-yi1, YANG Fan1, CHU Jin-gang1, YU Yang2, DAI Xu1. Coronary artery stent imaging using an integrated electronics detector and#br# different slice reconstructions: in vitro experience. JOURNAL OF CHINA MEDICAL IMAGING, 2016, 27(7): 467-470.
[1]Harald S, Murat O, Rainer R, et al. 64-Versus 16-slice CT angiography for coronary artery stent assessment: in vitro experience[J]. Invest Radiol, 2006, 41(1): 22-27.
（下转481页）
（上接470页）
[2]Ehara M, Surmely JF, Kawai M, et al. Diagnostic accuracy of 64-slice computed tomography for detecting angiographically significant coronary artery stenosis in an unselected consecutive patient population: comparison with conventional invasive angiography[J]. Cir J Off J Jap Cir Soc, 2006, 70(5): 564-571.
[3]Patel MR, Dehmer GJ, Hirshfeld JW, et al. ACCF/SCAI/STS/AATS/AHA/ASNC 2009 Appropriateness Criteria for Coronary Revascularization: a report by the American College of Cardiology Foundation Appropriateness Criteria Task Force, Society for Cardiovascular Angiography and Interventions, Society of Thoracic Surgeons, American Association for Thoracic Surgery, American Heart Association, and the American Society of Nuclear Cardiology Endorsed by the American Society of Echocardiography, the Heart Failure Society of America, and the Society of Cardiovascular Computed Tomography[J]. J Am Coll Cardiol, 2009, 53(6): 530-553.
[4]Florian A, Grigorios K, Waldemar H, et al. Performance of dual source versus 256-slice multi-slice CT in the evaluation of 16 coronary artery stents[J]. Eur J Radiol, 2013, 82(4): 601-607.
[5]Fabian M, Lotus D, André P, et al. Stenosis quantification in coronary CT angiography: impact of an itegrated circuit detector with iterative reconstruction[J]. Invest Radiol, 2013, 48(1): 32-40.
[6]Donati OF, Burg MC, Desbiolles L. High-pitch 128-slice dual-source CT for the assessment of coronary stents in a phantom model[J]. Acad Radiol, 2010, 17(11): 1366-1374.
[7]Eisentopf J, Achenbach S, Ulzheimer S, et al. Low-dose dual-source CT angiography with iterative reconstruction for coronary artery stent evaluation[J]. Jacc Cardiovascular Imaging, 2013, 6(4): 458-465.
[8]Ulrich A, Burg MC, Raupach R, et al. Coronary stent imaging with dual-source CT: assessment of lumen visibility using different convolution kernels and postprocessing filters[J]. Acta Radiol, 2015, 56(1): 42-50.
[9]王彦懿，初金刚，于扬，等. 不同迭代重建强度对冠状动脉小内径支架显示影响的体外实验[J]. 中国医学影像技术，2015，31（8）：1271-1275.
[10]Achenbach S, Ropers U, Kuettner A, et al. Randomized comparison of 64-slice single- and dual-source computed tomography coronary angiography for the detection of coronary artery disease[J]. Jacc Cardiovasc Imaging, 2008, 1(2): 177-186.
[11]Spiczak JV, Morsbach F, Winklhofer S, et al. Coronary artery stent imaging with CT using an integrated electronics detector and iterative reconstructions: first in vitro experience[J]. J Cardiovasc Comput Tomogr, 2013, 7(4): 215-222.
[12]Yang WJ, Chen KM, Pang LF, et al. High-definition computed tomography for coronary artery stent imaging: a phantom study[J]. Kor J Radiol Offic J Kor Radiol Soc, 2012, 13(1): 20-26.
[13]Martin C. Effective dose: how should it be applied to medical exposures[J]. Br J Radiol, 2014, 80(956): 639-647.
[14]Fabian M, Sebastian B, Wanner GA, et al. Reduction of metal artifacts from hip prostheses on CT images of the pelvis: value of iterative reconstructions[J]. Radiology, 2013, 268(1): 237-244.
[15]André F, Müller D, Korosoglou G, et al. In vitro assessment of coronary artery stents in 256-multislice computed tomography angiography[J]. Bmc Research Notes, 2014, 7(1): 1-10.
