The Clinical Feasibility Of The Coronary Stent Imaging Using Coronary CTA With Double-low Pattern

Background and purpose:With the rapid development of intracoronary stent implantation,the follow-up examination become more and more important,coronary CT Angiography is a very effective examination,but it can influence patients' health because of its radiation damage and contrast-induced damage,the "double-low"pattern with low voltage as well as low concentration contrast medium is considered to be a very effective way to decrease the damages induced by CT examination.The aim of this study is to evaluate the feasibility of the coronary stent imaging by means of low voltage as well as low concentration contrast medium.Methods:A total of 36 patients with coronary stents in our hospital were filtered retrospectively,and been respectively assigned into two groups:in one group(normal group),patients were scanned by a tube voltage of 120KV after administration of high concentration of 350mgI/mL iodixanol,in the other group(double-low group),patients were scanned by a tube voltage of 100KV after administration of low concentration of 270mgI/mL iohexol.then analyze the differences of image quality between the two groups through subjective and objective assessment.Results:There is difference of image quality between the two groups in subjective assessment(p<0.05),and the image quality of coronary stent in double-low group is better than that of the normal group.there are no differences of image quality between two groups in assessment of CT value of the root of the aorta and the value of lumen noise(p>0.05).and the average effective radiation dosage of double-low group is only 63%of that of normal group.Conclusion:The results of the study confirm that we can attain the equivalent image quality of coronary stent using coronary CTA with low voltage and low concentration of contrast,at the same time,the patients will suffer lesser radiation.