Division of Neuroradiology, Department of Radiology, Brigham and Women's Hospital, 75 Francis Street, Boston, MA, 02115, USA,
Neuroradiology. 2013 Oct;55(10):1183-8. doi: 10.1007/s00234-013-1228-8. Epub 2013 Jul 11.
Premature or delayed triggering of semiautomatic contrast tracking during intracranial computed tomographic angiography can occur due to artifact from dense contrast in the superior vena cava or brachiocephalic veins near the anterior aortic arch. We determine if placement of bolus tracking region-of-interest in the posterior thoracic aorta can prevent suboptimal intracranial arterial opacification.
Intracranial computed tomography angiographies from 80 patients performed on the same scanner were retrospectively evaluated. Thirty-seven consecutive patients with bolus tracking region-of-interest (ROI) placed in the anterior thoracic aorta (group A) and 43 consecutive patients with ROI placed in the posterior thoracic arch (group B) were identified. Two neuroradiologists scored the quality of intracranial computed tomography angiography on a four-point scale. Quantitative measurement of intracranial arterial opacification was also performed. The proportions of patients with poorest quality score as well as the proportions of the patients with the worst degree of intracranial arterial opacification (<10th percentile) were compared between groups A and B using two-sample proportion test.
Qualitative evaluation of the intracranial computed tomography angiography showed 4 (11%) patients in group A with poor quality (score of 1), while all patients in group B scored 2 or higher (p = 0.028). Seven (19%) patients in group A had the lowest quantitative score (mean arterial opacification < 10th percentile) while 1 (2.5%) patient in group B had the lowest score (p = 0.018).
Bolus tracking in the posterior thoracic aorta reduces the chance of suboptimal intracranial computed tomography angiography.
在颅内 CT 血管造影中，由于上腔静脉或头臂静脉中密集对比剂的伪影靠近主动脉弓前，半自动对比跟踪可能会过早或延迟触发。我们确定在后胸主动脉中放置团注跟踪感兴趣区是否可以防止颅内动脉显影不佳。
回顾性评估了在同一台扫描仪上进行的 80 例颅内 CT 血管造影。确定了 37 例连续在前胸主动脉（A 组）放置团注跟踪 ROI（感兴趣区）的患者和 43 例连续在后胸弓（B 组）放置 ROI 的患者。两位神经放射学家对颅内 CT 血管造影的质量进行了四点评分。还进行了颅内动脉显影的定量测量。使用两样本比例检验比较 A 组和 B 组中最差质量评分患者的比例以及颅内动脉显影最差程度（<第 10 百分位）患者的比例。
颅内 CT 血管造影的定性评估显示，A 组有 4 例（11%）患者质量差（评分为 1），而 B 组所有患者的评分均为 2 或更高（p=0.028）。A 组 7 例（19%）患者的定量评分最低（平均动脉显影<第 10 百分位），而 B 组只有 1 例（2.5%）患者的评分最低（p=0.018）。
在后胸主动脉中进行团注跟踪可降低颅内 CT 血管造影效果不佳的机会。
