摘要
Abstract
Objective To investigate the image quality and radiation dose of CT coronary angiography using 3D adaptive iterative dose reduction in overweight patients. Methods Eighty consecutive overweight patients with suspected coronary artery disease underwent coronary CT angiography with 640- slice CT scanner, the patients were randomly divided into two groups:the tube voltage was 120 kV in group A and 100 kV in group B. Al raw data were reconstructed by software FBP and 3D AIDR in CT system and two new subgroups in group A and B were created (A1, A2 and B1, B2), respectively.The values SI, SD, SNR, CNR, and image quality scores were compared between subgroups A1 and A2, and subgroups B1 and B2. The values of SI, SD, SNR, CNR and image quality scores were also compared between B2 and A1. Results The value of E in group B was decreased by 46%compared to group A.There was significant difference in mean image quality scores between groups A1 and A2 (P<0.05) and between groups B1 and B2 (P<0.05). There was no significant difference in mean image quality scores between groups A1 and B2. The values of SD in group A1 were significantly higher and SNR and CNR were lower than those in group A2 (P<0.05). The values of SD in group B1 were significantly higher and SNR and CNR were lower than those in group B2(P<0.05). There was significant difference in SI between group A1 and group B2 (P<0.05), but no difference in SD, SNR, CNR between two groups (P>0.05). Conclusion The 3D AIDR reconstruction algorithm can significantly improve the image quality of coronary artery in the equivalent dose, which are helpful for the image interpretable in the low dose for overweight patients.关键词
640层CT/超重/3D AIDR迭代重建法/冠状动脉CT血管造影/辐射剂量Key words
640- slice CT/Overweight patients/3D AIDR Iterative Reconstruction/Coronary CT angiography/Radi-ation dose
