Abstract：Objective To evaluate the impact of left or right side ulnar vein injection on the quality of cervical CTA examination.
Methods Eighty patients who had neck CTA examination from June 2018 to December 2018 were enrolled in this study.
Patients were divided into the left elbow vein group (group A, n=40) and the right elbow vein group (group B, n=40) according
to different injection sites of the contrast agent. CT enhancement value of bilateral common carotid artery, percentage of CT
enhancement value 250 HU of common carotid artery, contrast-filling condition of cervical collateral vein contrast agent and
interference condition of periclavicular vein on injection side were analyzed by interpretation and statistical analysis. Results
The enhancement values of bilateral common carotid arteries in group A and group B were 428.2±134.9, 424.9±122.8 (group A)
and 451.2±115.7, 438.9±136.3 (group B), respectively. The differences between the two groups were not statistically significant
(t=-0.799, P=0.429; t=0.467, P=0.643). The rate of CT number ≥250 HU was lower in Group A (82.5%) than in Group B
(95%). The contrast agent concentration in jugular collateral vein was higher in Group A than Group B (χ2=4.588, P=0.032).
The artifact of subclavian vein was no significant difference (χ2=2.143, P=0.143). Conclusion The right side elbow injection
of contrast agent can effectively avoid artifact interference of veins in the neck and improve the image quality of carotid
angiography.
