Abstract: Objective To investigate the clinical application of triggered non-contrast enhanced (TRANCE) magnetic resonance imaging in varicose veins (VV) of lower extremities. Methods Thirty patients with 41 segments of veins were examined by TRANCE and Doppler ultrasonography (DUS). Pearson correlation analysis was used to analyze the signal ratio (SR) and vessel diameter ratio (VDR) of VV. The Likert score consistency of TRANCE images was evaluated between the two doctors and between before and after 2 weeks. The digital subtraction angiography (DSA) was used as the gold standard, the diagnostic efficiency and consistency of the two inspection methods were evaluated. Results SR was negatively correlated with VDR (r=-0.440，P＜0.05). The overall Likert score was lower in the pelvic segment than that of thigh segment (P＜ 0.05), and there was no significant difference in Likert scores between the thigh and calf segments. The two doctors had good consistency in Likert scores of the pelvic, thigh, and calf segments before and after 2 weeks, and the Likert scores elevated by the same doctor before and after 2 weeks. With surgical results as the gold standard, the sensitivity of TRANCE and DUS of 41 segments of VV were 94.59% and 86.49%, the specificity were 50.00% and 75.00%, and the accuracy were 90.24% and 85.37%, respectively. The diagnostic efficiency kappa value of the two methods was 0.617, indicating good consistency. Conclusion TRANCE can quantitatively analyze the degree of VV and has good image quality in the diagnosis of lower extremity varicose veins, and the diagnostic efficiency is consistent with DUS. It can be used as an important preoperative auxiliary examination method.

Key words: varicose veins, angiography, digital subtraction, ultrasonography, doppler, magnetic resonance angiography, triggered non-contrast enhanced magnetic resonance angiography