Department of Technology, Sør-Trøndelag University College, Trondheim, Norway.
Eur J Vasc Endovasc Surg. 2011 Sep;42(3):332-9. doi: 10.1016/j.ejvs.2011.05.014. Epub 2011 Jul 22.
DynaCT(®) is a method for obtaining computed tomography (CT)-like images using a C-arm system. Our aim was to compare the accuracy of these images to multidetector CT (MDCT) images prior to endovascular aortic repair (EVAR).
A non-consecutive group of 20 elective patients were prospectively exposed to MDCT and one additional DynaCT before EVAR. Six arterial measurements and nine anatomical areas were chosen to: (1) visualise the peri-aortic soft tissue and assess the possibility to diagnose a potential haemorrhage from a ruptured aneurysm and (2) make the pre-treatment measurements before insertion of stent graft. Differences between modalities and readers were statistically compared using a linear mixed model.
For maximum aortic diameter, a significant difference of 1.3 mm was found between techniques (p = 0.043). Visibility scores were significantly better for all areas in MDCT data. Pre-treatment evaluation with DynaCT before EVAR was possible for all areas; evaluation of the iliac arteries were suboptimal due to a limited imaging volume size. Significant inter-reader differences were found for all anatomical areas.
The result indicates that DynaCT gives sufficient information to determine the correct treatment and for selecting the proper stent graft before EVAR. A limited volume size reduces the evaluation of the iliac arteries.
DynaCT(®) 是一种使用 C 臂系统获取计算机断层扫描（CT）样图像的方法。我们的目的是在血管内主动脉修复（EVAR）之前，比较这些图像与多排 CT（MDCT）图像的准确性。
一组 20 名非连续的择期患者前瞻性地接受了 MDCT 和一次额外的 DynaCT 检查，然后进行 EVAR。选择了六个动脉测量值和九个解剖区域：（1）可视化主动脉周围软组织并评估诊断破裂性动脉瘤潜在出血的可能性；（2）在植入支架移植物之前进行治疗前测量。使用线性混合模型对不同模式和读者之间的差异进行了统计学比较。
在最大主动脉直径方面，两种技术之间存在 1.3 毫米的显著差异（p = 0.043）。MDCT 数据的所有区域的可视性评分均明显更好。在 EVAR 之前使用 DynaCT 进行治疗前评估是可能的；由于成像体积有限，髂动脉的评估效果不佳。所有解剖区域的读者之间都存在显著的差异。
结果表明，DynaCT 提供了足够的信息来确定正确的治疗方法，并在 EVAR 之前选择合适的支架移植物。体积有限会降低对髂动脉的评估。
