QUALITY CONTROL OF LOWER LIMB ARTERY IMAGING BY 320 - SLICE SPIRAL CT AND ITS EFFECT IN ARTERIAL STENOSIS ASSESSMENT

FENG LI, JINGZHONG WANG, FENG CAO, HUI CHEN, WANBI WANG

Radiology Department, Xiangyang Central Hospital (Affiliated Hospital of Hubei University of Arts and Science), Xiangyang, 441021, China

Objective: This study aims to evaluate specific effect of 320-slice spiral CT in assessment of lower limb arterial stenosis, analyze the specific factors affecting imaging quality of lower limb artery by 320-slice spiral CT, and propose effective counter- measures.

Methods: The 400 patients receiving 320-slice spiral CT of lower limb arterial imaging examination in our hospital from March 2014 to March 2016 were included in the study. The differences in relevant parameters of general data, clinical manifesta- tion and scanning were analyzed, the specific factors affecting lower limb artery imaging quality were analyzed; According to the standard of spiral CT imaging, arterial stenosis of the patients was divided into 4 levels by considering general data, respectively less than 50%, 50%-75%, 76% -99%, occlusion. The specific effect of lower limb artery imaging by 320 - slice spiral CT under different grades of arterial stenosis was analyzed.

Results: As can be seen from the imaging results, the higher the level of arterial stenosis is, the higher the sensitivity and specificity of 320-slice spiral CT in evaluation of lower limb artery imaging is, especially sensitivity. There are significant differ- ences between the different levels (P <0.05); The imaging quality of lower limb artery by 320 - slice spiral CT is affected by such factors as contrast agent velocity, contrast agent concentration, contrast agent dose, delay time, scanning parameters, vascular calcification, patient age and reconstruction technique (P <0.05).

Conclusion: Lower limb artery imaging by 320 - slice spiral CT has a high sensitivity and specificity, which enjoys great value in clinical application.