Research On The Application Of Dual-source CT Coronary Artery Angiography

Objective To analyze the relationship between various affect factors and image quality, and to explore appropriate solutions.Materials and Methods We consecutively enrolled 926 patients in this study. To collect the scanning parameters of all cases ,such as average heart rate ,heart rate change, the data of cardiac cycle, FOV,Pitch values ,the volume and rate of iodinated contrast media, trigger threshold, trigger time et al and evaluate the images quality, analysis of the scan parameters and the relationship between image quality and affect factors.Results Of several factors, the average heart rate, heart rate, the FOV and the image quality was statistically significant correlation. Average heart rate or heart rate changes and the image quality were negatively correlated; FOV was positively correlated with the image quality. The others factors associated with the image quality were not statistically.Conclusion①Without usingβ-receptor blocking to control heart rate ,success rate of the DSCT coronary angiography image is 99.03%, good rate of image is 95.68%.②When the heart rate≤80bpm , we can get excellent images in the systolic and diastolic two phases; If heart rate> 80bpm we generally get excellent images only in the systolic phase. The turning point that the best reconstruction window moved from the systolic to diastolic is the heart rate 80bpm.③Average heart rate and the image quality was negatively correlated. Image quality decreased with faster heart rate.④Heart rate change and the image quality was negatively correlated. When the heart rate > 20bpm, DSCT coronary angiography significantly decreased, and even cause failure.⑤FOV was positively correlated with the image quality. Too small FOV (≤160mm) to scan, image quality can also cause a certain degree decreasing. Objective To investigate the diagnosis value of congenital coronary artery anomalies (CCA) with dual-source CT coronary angiography and analysis the best display method, imaging and clinical significance of different types of CCA.Materials and Methods The data of dual-source CT coronary Angiography (DSCTCA) from 3011 patients were analyzed. All CCA cases were depicted with various post-processing method. The depiction rate and CT findings of CCA were summarized and the clinical significance of different types of CCA was analysis integrating the clinical data.Results A total of 749 cases of CCA were found in the 3011 patients who undergoing DSCTCA,giving the detect rate of 24.84% (749/3011),including anomalies of origin of 59 cases(The depiction rate is 1.96% and the proportions is 7.89%),myocardial bridge of 682 cases (The depiction rate is 22.65% and the proportions is 91.18%),and abnormal termination of 7 cases (The depiction rate is 0.23% and the proportions is 0.93%).Conclusion DSCT coronary angiography could diagnose CCA perfectly. It could be used as the first choose of imaging tools for suspected CCA.Of many post-processing methods, VR image is the best to show CCA.MB-MCA is the most common CCA. Coronary artery origin anomalies are the CCA with high potential risk.