Revolution CT行冠状动脉联合胸腹主动脉成像

CT angiography of coronary artery combined with thoracoabdominal aorta using Revolution CT

目的观察Revolution CT用于冠状动脉联合胸腹主动脉CT血管造影(CTA)的价值。方法采用Revolution CT分别对A组、B组、C组各40例疑诊冠状动脉和/或主动脉病变患者行冠状动脉联合胸腹主动脉CTA、常规冠状动脉CTA及常规胸腹主动脉CTA。记录患者有效辐射剂量(ED),比较A组与B组、A组与C组CT值、噪声比(SNR)及对比噪声比(CNR)的差异,评价图像质量。结果A组与B组冠状动脉各目标分支血管CT值差异无统计学意义(P均>0.05);左回旋支SNR及CNR差异有统计学意义(t=2.84、2.61,P均<0.05),其余各分支血管SNR、CNR差异无统计学意义(P均>0.05)。A组与C组主动脉髂总动脉分叉处CT值差异有统计学意义(t=3.63,P<0.05),膈肌水平主动脉SNR、CNR差异均有统计学意义(t=-2.92、-2.76,P均<0.05),其余主动脉分支CT值、SNR、CNR差异均无统计学意义(P均>0.05)。A组冠状动脉CTA所致ED[(3.00±0.39)mSv]与B组[(3.03±0.42)mSv]差异无统计学意义(t=-0.91,P>0.05);A组胸腹主动脉CTA所致ED[(4.60±1.09)mSv]低于C组[(10.88±1.15)mSv,t=-17.79,P<0.05]。结论采用Revolution CT行冠状动脉联合胸腹主动脉CTA图像质量佳,且可显著降低ED。

Objective To investigate the value of Revolution CT for CT angiography(CTA)of coronary artery combined with thoracoabdominal aorta.Methods Totally 120 patients with suspected coronary artery and/or aortic diseases underwent CTA of coronary artery combined with thoracic and abdominal aorta(group A),coronary artery alone(group B)as well as thoracic and abdominal aorta(group C)using Revolution CT,respectively(each n=40).The effective radiation dose(ED)was recorded,and CT value,signal noise ratio(SNR)and contrast noise ratio(CNR)were compared between group A and group B,also between group A and group C.Results There was no statistical difference of CT value of target branches of coronary artery between group A and group B(all P>0.05),nor of SNR and CNR of other branches(all P>0.05),while significant differences of SNR and CNR were found of left circumflex artery(t=2.84,2.61,both P<0.05).There were significant differences of CT value of common iliac artery bifurcation between group A and group C(t=3.63,P<0.05),also of SNR and CNR of aorta at diaphragm level between group A and group C(t=-2.92,-2.76,both P<0.05),but no of CT value,SNR nor CNR of other vascular branches(all P>0.05).There was no significant difference of ED between group A and group B during coronary artery CTA([3.00±0.39]mSv vs[3.03±0.42]mSv,t=-0.91,P>0.05),while ED of patients in group A([4.60±1.09]mSv)was lower than that in group C([10.88±1.15]mSv)during CTA of thoracic and abdominal aorta(t=-17.79,P<0.05).Conclusion CTA of coronary artery combined with thoracoabdominal aorta using Revolution CT might obtain satisfactory imaging quality and significantly reduce ED.