摘要
目的探讨在单纯冠状动脉CT血管造影(CTA)对比剂用量下,256排Revolution CT行胸痛三联CTA的成像质量与强化效果。方法搜集30例因急性胸痛入院,使用256排Revolution CT在65 ml对比剂剂量下行胸痛三联CTA检查的患者为研究组,选取同时期、相同对比剂剂量下使用Revolution CT行单纯冠状动脉CTA检查的30例患者为对照组。测量两组右冠状动脉、左主干、左前降支、左回旋支的CT值、噪声,比较两组的信噪比(SNR)、对比噪声比(CNR)。将冠状动脉分为4个等级进行主观评价,评价冠状动脉各节段得分的差异,肺动脉及胸主动脉以CT值>200 HU作为满足诊断标准。两组计量资料的比较采用t检验或非参数秩和检验,等级资料的比较采用非参数秩和检验,P<0.05表示差异具有统计学意义。结果研究组与对照组右冠状动脉、左主干、左前降支、左回旋支的CT值(t/z=0.463、0.576、0.148、0.962,P=0.646、0.574、0.882、0.34,P均>0.05)、噪声(t/z=0.699、-1.309、-1.834、-0.702,P=0.487、0.190、0.067、0.486,P>0.05)、信噪比(t/z=-1.131、-0.858、1.941、0.098,P=0.258、0.391、0.057、0.328,P均>0.05)及右冠状动脉的CNR(t=0.531,P=0.598),无显著差异,研究组与对照组冠状动脉各节段主观评分无显著差异(P均>0.05),研究组肺动脉主干CT值为(558±85) HU,CT值均>200 HU,胸主动脉CT值为(486±110) HU,CT值均>200 HU。结论 256排Revolution CT在与单纯冠状动脉CTA相同对比剂剂量下行胸痛三联CTA检查,不仅可获得相同的冠状动脉图像,而且可获得良好的肺动脉及胸主动脉图像。
Objective The aim of study was to evaluate image quality and arterial enhancement of triple-rule-out(TRO) against a dedicated coronary CT angiography(CTA) protocols when using the same amount of contrast medium. Methods Sixty patients who underwent TRO(n=30) or CTA(n=30) protocols were enrolled in this study. Total contrast medium(65 ml) was kept constant. All scans were performed using a 256-row CT scanner(Revolution CT,GE Healthcare). The arterial enhancement and noise in right coronary artery( RCA),left main artery( LMA),left anterior descending( LAD) and left circumflex( LCX) artery were recorded. Signal-to-noise( SNR) and contrast-to-noise( CNR) ratio were calculated. Subjective image quality was evaluated on a four-point scale. A minimum arterial enhancement of 200 HU is required for the diagnosis of pulmonary trunk and ascending thoracic aorta. The student t-test( normal distributed value) and Mann-Whitney U test( non-normal distributed value) were used for qualitative and quantitative assessment,respectively. P < 0. 05 indicates the result is statistically significant. Results There was no significant difference in arterial enhancement( t/z = 0. 463,0. 576,0. 148,0. 962,P = 0. 646,0. 574,0. 882,0. 34,P > 0. 05),noise( t/z = 0. 699,-1. 309,-1. 834,-0. 702,P = 0. 487,0. 190,0. 067,0. 486,P > 0. 05) and SNR( t/z =-1. 131,-0. 858,1. 941,0. 098,P = 0. 258,0. 391,0. 057,0. 328,P > 0. 05) of RCA,LMA,LAD and LCX artery between TRO group and CTA group( P > 0. 05). CNR( t = 0. 531,P = 0. 598) of RCA revealed no difference between the two groups( PP > 0. 05).There was no significant difference in subjective scores of the coronary segments between TRO and the CTA group( P >0. 05). Conclusion TRO examination using 256-row Revolution CT can achieve comparable image quality and arterial enhancement of pulmonary trunk and ascending thoracic aorta against dedicated coronary CTA when using same amount of contrast medium.
作者
郭文文
王威
邵海磊
吴晓璐
肖旻
徐秋贞
GUO Wenwen;WANG Wei;SHAO Hailei(Department of Radiology,Southeast University Medical College,Affiliated Zhongda Hospital of Southeast University,Nanjing 210009,P.R.China)
出处
《临床放射学杂志》
CSCD
北大核心
2019年第11期2170-2175,共6页
Journal of Clinical Radiology
