In this study, the authors evaluated the performance characteristics of contrast-enhanced electron-beam tomography (EBT) with three-dimensional reconstruction in defining the coronary artery lumen in healthy subjects. Thirty patients with normal coronary angiograms by selective coronary arteriography (SCA) underwent contrast-enhanced EBT examination. Measured parameters included degree of luminal enhancement, intravascular contrast-to-noise ratio (CNR), and diameter and length of visualized lumen. Ventricular cavity, aortic blood pool, and coronary artery attenuation were found to be significantly different before and after intravenous injection of contrast material (p < 0.001). CNR decreased from proximal to distal segments within each vessel (p < 0.001), with a peak of 11.2 ±2.3 occurring in the proximal left anterior descending coronary artery (LAD) to a low of 4.8 2.0 in the distal left circumflex (LCX). Luminal diameters visualized by EBT had no significant difference with that of SCA (p > 0.05). Therefore, EBT angiography with three-dimensional reconstruction allows for noninva sive coronary arteriography revealing long segments of the major coronary arteries in normal subjects.
在这项研究中,作者评估了增强电子束断层摄影术(EBT)与三维重建在定义健康受试者冠状动脉腔内的性能特征。30名正常冠状动脉造影结果显示正常的患者接受了增强EBT检查。测量的参数包括腔内增强程度、血管内对比噪音比(CNR)、可视化腔的直径和长度。在静脉注射造影剂前后,心室腔、主动脉血池和冠状动脉的衰减在统计学上存在显著差异(p < 0.001)。CNR在每个血管内从近端到远端段逐渐降低(p < 0.001),在近端左前降冠状动脉(LAD)达到峰值11.2 ± 2.3,而在远端左回旋支(LCX)降至4.8 ± 2.0。EBT可视化的腔径与造影术(SCA)无显著差异(p > 0.05)。因此,具有三维重建的EBT血管造影术可实现非侵入性冠状动脉造影,揭示正常受试者主要冠状动脉的长段。