CAJ | 학술논문

目的通过模拟冠状动脉 CT 血管成像(CTA)中应用双扇区重建时心率变化可能导致的时相错位,评价双扇区重建中时相一致性对冠状动脉显示的影响.资料与方法30例患者采用回顾性心电门控扫描行冠状动脉 CTA 检查,对右冠状动脉垂直走行段行图像重建,包括:①75%单扇区重建;②75%双扇区重建;③前一个心动周期以 R-R 间期75%为中心,后一个心动周期分别以69%、72%、78%、81%为中心进行双扇区重建.选择各次重建均包含的3个轴面,从血管中心密度、面积、形态(横、纵径比值)、边缘锐利度评价冠状动脉显示情况.结果 ①75%双扇区重建与75%单扇区重建比较,各参数差异均无统计学意义(P>0.05);②其余各次双扇区重建分别与75%单扇区重建比较,各参数差异均有统计学意义(P<0.05),且差异随时相间隔增大而增大.结论??双扇区重建中时相一致性是保证重建图像准确性的关键因素,心率变化导致的时相差可以改变所显示冠状动脉的形态和特征,并进而可能造成对冠状动脉狭窄评价的偏差.
목적통과모의관상동맥 CT 혈관성상(CTA)중응용쌍선구중건시심솔변화가능도치적시상착위,평개쌍선구중건중시상일치성대관상동맥현시적영향.자료여방법30례환자채용회고성심전문공소묘행관상동맥 CTA 검사,대우관상동맥수직주행단행도상중건,포괄:①75%단선구중건;②75%쌍선구중건;③전일개심동주기이 R-R 간기75%위중심,후일개심동주기분별이69%、72%、78%、81%위중심진행쌍선구중건.선택각차중건균포함적3개축면,종혈관중심밀도、면적、형태(횡、종경비치)、변연예리도평개관상동맥현시정황.결과 ①75%쌍선구중건여75%단선구중건비교,각삼수차이균무통계학의의(P>0.05);②기여각차쌍선구중건분별여75%단선구중건비교,각삼수차이균유통계학의의(P<0.05),차차이수시상간격증대이증대.결론??쌍선구중건중시상일치성시보증중건도상준학성적관건인소,심솔변화도치적시상차가이개변소현시관상동맥적형태화특정,병진이가능조성대관상동맥협착평개적편차.
Purpose To evaluate the influence of data consistency on image quality of coronary CT angiography (CTA) with bi-sector reconstruction, by simulating phase mismatch that may occur in patients with arrhythmia. Materials and Methods 30 cases with normal findings on coronary CTA using ECG gated spiral scan were included. Targeted retrospective reconstructions of the vertical portion of right coronary artery were performed including half-reconstruction at 75% R-R interval, bi-sector reconstruction at 75%, bi-sector reconstructions with data centered 75% of the first cardiac cycle and those centered at 69%, 72%, 78% and 81% of the second cardiac cycle respectively. Three slices reconstructed with bi-sector reconstruction algorithm in all bi-sector reconstructions were used for analysis in each case. Central density of vessel enhancement, cross-sectional area, shape of vessel (depicted by ratio of long axis/short axis) and sharpness of vessel margin were analyzed to evaluate image quality. Results ① There was no significant difference between the parameters with half reconstruction and bi-sector reconstruction at 75% R-R interval (P>0.05).② The parameters with all other bi-sector reconstructions were significantly different from those with half reconstruction (P<0.05), while the difference increased as the phase mismatch increasesd. Conclusion Phase matching is critical to the accuracy of CTA in bi-sector reconstruction. Mismatch caused by heart rate variation may lead to alteration of the characteristics of coronary artery, with possible subsequent bias on stenosis evaluation.