| QIAN Yu-e,HU Hong-jie,WANG Dan,WANG Gao-feng,JIANG Feng,ZHANG Shi-zheng.Assessment of coronary artery stent and radiation dose using dual source CT[J].Chinese Journal of Radiological Medicine and Protection,2011,31(3):366-369 |
| Assessment of coronary artery stent and radiation dose using dual source CT |
| Received:January 16, 2011 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.03.033 |
| KeyWords:Dual source CT Coronary artery stent Radiation dose |
| FundProject: |
| Author Name | Affiliation | | QIAN Yu-e | Department of Radiology , Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China | | HU Hong-jie | Department of Radiology , Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China | | WANG Dan | Department of Radiology , Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China | | WANG Gao-feng | Department of Radiology , Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China | | JIANG Feng | Department of Radiology , Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China | | ZHANG Shi-zheng | Department of Radiology , Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou 310016, China |
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| Abstract:: |
| Objective To compare a prospective ECG-gated high-pitch spiral technique (Flash) and conventional retrospective ECG-gated spiral technique for the image quality of coronary artery stent and radiation dose with a dual source CT. Methods One hundred and fifty five coronary stents in one hundred and twenty patients (mean age 64.9±10.6 years, heart rates≤65 bpm) were examined using a dual source CT. All patients were divided in two groups, receiving either Flash or conventional coronary artery CT angiography separately. After images of coronary artery were reconstructed using both the smooth (B26) and sharp (B46) kernel, the coronary stent image quality and stent lumen were scored by two observers individually using four point scale (1=excellent, 4=unvaluable). The effective radiation dose of volume CT dose index (CTDIvol, mGy) and dose length product (DLP, mGy×cm) were also calculated for each patient. χ2 -test analysis of image quality andt-test analysis of radiation dose were used respectively for statistical difference between two groups. Results Interobserver agreement for stent image quality was good ( Kappa =0.764, P <0.001). The mean scores were 1.61±0.77 and 1.65±0.82 in Flash group and conventional group respectively. There was no significant difference in image quality between the two groups ( χ2 =0.865, P =0.834). The effective radiation dose in Flash group was significantly lower than that in conventional group. The mean values of CTDIvol were 3.24±1.21 in Flash group and 31.26±10.79 in conventional group (t=19.83, P <0.001), and the mean values of DLP in Flash group and conventional group were 54.61±19.88 and 468.30±174.88, respectively (t=18.06, P <0.001). Conclusions Compared with the conventiaonal coronary artery CT angiography, the Flash coronary artery CT angiography technique has a similar coronary stent image quality, but at a lower radiation dose in patients with heart rates lower than 65 beats per minute. |
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