Santos Armentia E, Tardáguila de la Fuente G, Castellón Plaza D, Delgado Sánchez-Gracián C, Prada González R, Fernández Fernández L, Tardáguila Montero F
Servicio de Radiodiagnóstico, Hospital Povisa, Vigo, Pontevedra, España.
Servicio de Radiodiagnóstico, Hospital Povisa, Vigo, Pontevedra, España.
Radiologia. 2014 May-Jun;56(3):241-6. doi: 10.1016/j.rx.2012.02.003. Epub 2012 May 15.
To study the differences in vascular image quality, bone subtraction, and dose of radiation of dual energy CT angiography of the supraaortic trunks using different tube voltages.
We reviewed the CT angiograms of the supraaortic trunks in 46 patients acquired with a 128-slice dual source CT scanner using two voltage protocols (80/140 kV and 100/140 kV). The "head bone removal" tool was used for postprocessing. We divided the arteries into 15 segments. In each segment, we evaluated the image quality of the vessels and the effectiveness of bone removal in multiplanar reconstructions (MPR) and in maximum intensity projections (MIP) with each protocol, analyzing the trabecular and cortical bones separately. We also evaluated the dose of radiation received.
Of the 46 patients, 13 were studied using 80/140 kV and 33 with 100/140 kV. There were no significant differences between the two groups in age or sex. Image quality in four segments was better in the group examined with 100/140 kV. Cortical bone removal in MPR and MIP and trabecular bone removal in MIP were also better in the group examined with 100/140 kV. The dose of radiation received was significantly higher in the group examined with 100/140 kV (1.16 mSv with 80/140 kV vs. 1.59 mSv with 100/140 kV).
Using 100/140 kV increases the dose of radiation but improves the quality of the study of arterial segments and bone subtraction.
研究使用不同管电压的双能量CT血管造影对上主动脉干血管图像质量、骨质去除及辐射剂量的差异。
我们回顾了46例患者使用128层双源CT扫描仪采用两种电压方案（80/140 kV和100/140 kV）获取的上主动脉干CT血管造影图像。使用“头部去骨”工具进行后处理。我们将动脉分为15段。在每一段中，我们评估了每种方案在多平面重建（MPR）和最大密度投影（MIP）中血管的图像质量以及骨质去除的效果，分别分析小梁骨和皮质骨。我们还评估了所接受的辐射剂量。
46例患者中，13例采用80/140 kV进行研究，33例采用100/140 kV。两组在年龄或性别上无显著差异。100/140 kV检查组在四个节段的图像质量更好。100/140 kV检查组在MPR和MIP中的皮质骨去除以及MIP中的小梁骨去除也更好。100/140 kV检查组所接受的辐射剂量显著更高（80/140 kV为1.16 mSv，100/140 kV为1.59 mSv）。
使用100/140 kV会增加辐射剂量，但可提高动脉节段研究及骨质去除的质量。
