可变螺距技术(VHP)在冠状动脉旁路移植术后CTA复查中的检测效能  

Detection Efficiency of Variable Pitch Technique(VHP)in CTA Review after Coronary Artery Bypass Grafting

作　　者：耿纪刚 李笑石 朱寅虎 李馨 金大永 易成刚 秦越 GENG Ji-gang;LI Xiao-shi;ZHU Yin-hu;LI Xin;JIN Da-yong;YI Cheng-gang;QIN Yue(Department of Imaging,Xi'an Daxing Hospital,Xi'an 710016,Shaanxi Province,China;Plastic Surgery,First Affiliated Hospital of Air Force Military Medical University,Xi'an 710032,Shaanxi Province,China)

机构地区：[1]西安大兴医院影像科,陕西西安710016 [2]空军军医大学第一附属医院整形外科,陕西西安710032

出　　处：《中国CT和MRI杂志》2023年第3期89-92,共4页Chinese Journal of CT and MRI

基　　金：陕西省重点研发计划项目(2019SF-036)。

摘　　要：目的分析可变螺距技术(VHP),在冠状动脉旁路移植(CoronaryArteryBypassGrafts,CABG)术后CTA复查的检测效能。方法前瞻性选取本院2020年1月至7月60例CABG术后需进行冠状动脉CTA复查的患者,将患者按随机数字法分成A、B两组,每组30例。VHP技术编为A组,常规扫描技术为B组。对两组图像质量进行主、客观评价,并记录两组检查的总辐射剂量;主观评价采用双盲法五级评分,分别对两组图像的桥血管进行打分并统计。客观评价采用测量桥血管近端吻合口、血管中段、血管远端吻合口的CT值和SD值并计算信噪比(SNR)和对比噪声比(CNR)。所得数据利用统计学软件进行比较。结果主观评价中.A组与B组能完.成诊断的桥血管数量分别.为97根(951.%)与93根(969%),无统计学差异(P=08980,P>005)。客观评价中,两组图像在CT值、SD.值、SNR值及CNR值上的对比无统.计学差异.(P>005.),A组平均辐射剂量为(DLP=5563.0±355.6mGyc.m),B组平均辐射剂量为(DLP=9.8960±5222mGycm),两组之间有显著差异(P<005)。结论冠脉动脉搭桥术后CTA复查采用VHP技术可以在保证图像质量前提下,将辐射剂量显著减低,值得在日常工作中推广应用。Objective To analyze the detection efficiency of variable pitch technique(VHP)in CTA review after coronary artery bypass grafts(CABG).Methods Prospectively select 60 patients in our hospital who need to undergo coronary CTA reexamination after CABG from January to July 2020,and divide the patients into two groups A and B according to the random number method,with 30 cases in each group.VHP technology is classified as group A,and conventional scanning technology is classified as group B.Subjectively and objectively evaluate the image quality of the two groups,and record the total radiation dose of the two groups;the subjective evaluation adopts a five-level doubleblind scoring method,and scores and counts the grafts of the two groups of images.The objective evaluation was to measure the CT value and SD value of the proximal anastomosis of the graft vessel,the middle of the vessel,and the distal end of the vessel,and calculate the signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR).The data obtained were compared using statistical software.Results In the subjective evaluation,the number of graft vessels that can be diagnosed in group A and group B were 97(95.1%)and 93(96.9%),respectively,with no statistical difference(P=0.8980,P>0.05).In the objective evaluation,there was no statistical difference in CT value,SD value,SNR value and CNR value between the two groups of images(P>0.05).The average radiation dose of group A was(DLP=556.30±35.56mGy.cm).The average radiation dose of group B was(989.60±52.22mGy.cm),and there was a significant difference between the two groups(P<0.05).Conclusion The use of VHP technology in the CTA review after coronary artery bypass graft surgery can significantly reduce the radiation dose under the premise of ensuring the image quality,and it is worthy of popularization and application in daily work.

关 键 词：冠状动脉旁路移植术 冠状动脉CT血管成像术 可变螺距技术 宽体探测器 

分 类 号：R445.3[医药卫生—影像医学与核医学]