320排CT VHP技术联合迭代算法在TAVR术前CTA中的应用价值  

Application Value of 320-Slice CT VHP Combined with Iterative Algorithm in Preoperative CTA of TAVR

作　　者：许兵 赵冰辉 朱洁 田冰 弓静 王敏杰 XU bing;ZHAO bing-hui;ZHU Jie;tIAN bing;GONG Jing;WANG Min-jie(Department of radiology,the First Affiliated Hospital of Naval Military Medical University,Shanghai 200433)

机构地区：[1]海军军医大学第一附属医院放射诊断科,上海200433

出　　处：《中国CT和MRI杂志》2021年第12期59-63,共5页Chinese Journal of CT and MRI

摘　　要：目的通过分析TAVR患者术前CTA主观及客观图像质量,探讨320排CT VHP技术联合迭代算法在TAVR术前评估的应用价值。方法前瞻性纳入心血管外科行主动脉瓣膜置换的患者,所有患者术前均行320排CT VHP技术进行CTA检查。按随机数字法分为80kV组、100kV组、120kV组。三组对比剂用量分别为0.9、1.1、1.2mL/kg体重;流速分别为:3、3.5、4mL/s。每组患者图像分别采用AIDR与FBP算法,最终得到六个亚组图像。比较三组各组图像质量。所有数据采用SPSS 21.0统计软件进行分析,P<0.05表示有统计学意义。结果每组各32人入组本研究。三组患者之间一般资料比较差异均无统计学意义。80kV组:AIDR算法在左、右颈总动脉及左、右股动脉层面的主观评分均高于FBP组(P<0.001);100kV组及120kV组:AIDR算法各层面的主观评分均高于FBP组(P<0.001);三组AIDR算法各层面的平均SD值均小于FBP组(P<0.001),CNR值均大于FBP组(P<0.001)。结论320排CT VHP技术联合迭代算法在管电压为80kV,100kV,120kV均能获得良好的图像质量,相对于FBP组图像质量更高。80kV相对120kV可以适当减少对比剂用量,100kV相对120kV可以适当降低辐射剂量。Objective To explore the application value of 320-slice CT VHP combined with the iterative algorithm in the preoperative evaluation of TAVR by analyzing the subjective and objective image quality of CTA in TAVR patients.Methods Patients who underwent aortic valve replacement in cardiovascular surgery were prospectively enrolled.All patients underwent preoperative 320-slice CT VHP for CTA examination.According to the random number method,they were divided into 80kV group,100kV group,120kv group.Contrastive agents for the three groups were 0.9mL/kg,1.1mL/kg,and 1.2mL/kg body weight,respectively.The flow rates were 3,3.5,and 4mL/s.AIDR and FBP algorithms were adopted for images of each group of patients,and six subgroups of images were finally obtained.The image quality of the three groups was compared.All data were analyzed using SPSS 21.0 statistical software,and P<0.05 indicated statistical significance.Results 32 participants in each group were enrolled in this study.There was no significant difference in general data between the three groups.In the 80kV group,the subjective scores of the AIDR algorithm in left and right common carotid artery and left and right femoral artery were higher than those in the FBP group(P<0.001).100kV group and 120kV group:Subjective scores of AIDR algorithm at all levels were higher than those of FBP group(P<0.001);The average SD values of each layer of AIDR algorithm in the three groups were all lower than those in the FBP group(P<0.001),and the CNR values were all higher than those in the FBP group(P<0.001).Conclusion 320-slice CT VHP technology combined with an iterative algorithm can obtain good image quality in the tube voltage of 80kV,100kV,and 120kV,and the image quality is higher than that of the FBP group.80kV compared with 120kV can appropriately reduce the dosage of contrast agent,100kV compared with 120kV can appropriately reduce the radiation dose.

关 键 词：320排CT 可变螺距技术 迭代算法 

分 类 号：R445.3[医药卫生—影像医学与核医学]