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【目的】探讨双源CT血管成像（CTA）在椎动脉沟环中的诊断价值。【方法】收集头颈部双源CTA检查中发现椎动脉沟环的患者62例的临床资料，分析椎动脉沟环分型并测量椎动脉直径。【结果】62例椎动脉沟环的分型：Ⅳ型38例，占61．3％，其中25例为双侧全环型，13例为单侧全环型（右侧8例、左侧4例）；Ⅲ型6例，占9．7％，为弧形骨桥弓顶部骨质中断，两端呈鸟嘴状；Ⅰ型及Ⅱ型18例，占29．0％，其中Ⅰ型（前半环）3例、Ⅱ型（后半环）15例。测量全环型椎动脉沟环上下径3．1～8．2（4．8±0．3）mm ，前后径4．2～9．1（7．1±0．3）mm ，同时测量寰椎椎动脉沟环处椎动脉直径1．8～5．9（3．7±0．8）m m ，椎动脉局部狭窄15例，狭窄程度10％～30％。【结论】双源CTA能够准确地显示寰椎椎动脉沟环形态及由其对椎动脉卡压所致的狭窄。“,”[Objective] To explore the value of dual-source CT angiography (DSCTA ) in the diagnosis of vertebral artery sulcus ring .[Methods]Clinical data of 62 patients with vertebral artery sulcus ring diagnosed by DSCTA were col-lected .The types of whole-ring-type vertebral artery sulcus ring were analyzed .The diameter of vertebral artery was measured .[Results] The types of 62 patients with vertebral artery included Ⅳ type in 38 patients(61 .3% ) in which 25 patients were bilateral whole-ring type and 13 patients were unilateral whole-ring type(8 patients with right side and 4 pa-tients with left side) ,Ⅲ type in 6 patients (9 .7% ) which were bone breaking in curve bone bridge arch with both beak-like sides ,typeⅠandⅡ in 18 patients(29 .0% ) in which 3 patients were type I anterior semi-ring and 15 patients were typeⅡ posterior semi-ring .The upper and lower diameters of whole-ring type vertebral artery sulcus ring were 3 .1~8 .2 (4 .8 ± 0 .3)mm and anteroposterior diameters were 4 .2~9 .1(7 .10 .3)mm .The diameter of vertebral artery in atlas ver-tebral artery sulcus ring was 1 .8~5 .9(3 .7 ± 0 .8)mm .Local stenosis of vertebral artery was found in 15 patients ,and the stenosis rate was 10% ~30% .[Conclusion]DSCTA can accurately display the shape of atlas vertebral artery sulcus ring and stenosis caused by vertebral artery entrapment .