64-slice computed tomography assessment of coronary artery stents:: a phantom study

被引:34
作者
Mahnken, AH
Mühlenbruch, G
Seyfarth, T
Flohr, T
Stanzel, S
Wildberger, JE
Günther, RW
Kuettner, A
机构
[1] Rhein Westfal TH Aachen, Dept Diagnost Radiol, D-52074 Aachen, Germany
[2] Siemens Med Solut, Forchheim, Germany
[3] Rhein Westfal TH Aachen, Inst Med Stat, Aachen, Germany
[4] Univ Tubingen, Tubingen, Germany
关键词
coronary vessels; stents and prostheses-computed tomography CT; multidetector row-coronary vessels; CT-computed tomography (CT); angiography;
D O I
10.1080/02841850500406779
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Purpose: To compare the use of a new 64-slice computed tomography (CT) scanner with 16-slice CT in the visualization of coronary artery stent lumen. Material and Methods: Eight different coronary artery stents, each with a diameter of 3 mm, were placed in a static chest phantom. The phantom was positioned in the CT gantry at an angle of 0 degrees and 45 degrees towards the z-axis and examined with both a 64-slice and a 16-slice CT scanner. Effective slice thickness was 0.6 min with 64-slice CT and I mm with 16-slice CT. A reconstruction increment of 0.3 mm was applied in both scanners. Image quality was assessed visually using a 5-point grading scale. Stent diameters were measured and compared using paired Wilcoxon tests. Results: Artificial lumen reduction was significantly less with 64-slice than with 16-slice CT. Average visible stent lumen was 53.4% using 64-slice CT and 47.5% with 16-slice MSCT. Most severe artifacts were seen in stents with radiopaque markers. Using 64-slice CT, image noise increased by approximately 30% due to thinner slice thickness. Conclusion: Improved spatial resolution of 64-slice CT resulted in superior assessment of coronary artery stent lumen compared to 16-slice CT. However, a relevant part of the stent lumen is still not assessable with multi-slice CT.
引用
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页码:36 / 42
页数:7
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