Abstract：Objective To obtain optimal images for portal vein blood vessels under low radiation dose and
low contrast agent condition, the present study performed image capturing via application of dual-energyportal venous phase scan mode, as well as reconstructing images via fusion coefficient reconstruction
model. Methods Sixty patients that were going to undergo portal vein angiography were randomly
divided into A, B groups, and each group contained 30 cases. Group A was conducted dual-energy
scanning with the dosage of contrast agent of 1 mL/kg. Group B was conducted normal scanning with
the traditional single energy of 120 kV, the contrast agent dosage of 1.2 mL/kg. The CT value of the
portal vein and the noise of the images were measured, the value of the SNR and CNR were calculated.
In addition, the quality of the images was evaluated by two radiologists under a model of five points.
Finally, SPSS 17.0 software were utilized to conducting statistical analysis on the data of the images.
Results The CT value of the portal vein Group A and group B were separately more than 175 HU and
124 HU. There was a statistical difference between these two groups. Compared with group B, the image
quality of group A was obviously improved, and the image scores were significantly higher than that of
group B. The image score of group A was (4.4±0.5), and the image score of group B was (3.8±0.38).
It was statistically significant between these two groups (P<0.05). The radiation dose of group A was
lower than that of group B, with a decrease of 35%. Conclusion High quality of portal vein blood vessel
image could be obtained by using double energy scanning and fusion coefficient reconstruction model
to reconstructed images. Meanwhile, the radiation dose was lower and the contrast agent dosage was
decreased nearly by 35%. However, compared with the traditional single energy scanning, the portal
vein blood vessels average CT value of the dual-energy scanning was increased by more than 60 HU.
Therefore, it is worthy of clinical expansion.
李剑，石磊，刘豹，王栋，
杨红兵，刘从伟，吴志斌，
石明国. 低辐射剂量和低对比剂用量在门静脉血管成像技术的应用[J]. 中国医疗设备, 2017, 32(5): 11-14.
LI Jian, SHI Lei, LIU Bao,
WANG Dong, YANG Hong-bing,
LIU Cong-wei, WU Zhi-bin,
SHI Ming-guo. Applications of Low Radiation Dose and Low Contrast Agent in Portal
Vein Vascular Imaging. China Medical Devices, 2017, 32(5): 11-14.
