低剂量对比剂在64排CT头颈部血管联合成像中的应用

Application of Low Dose Contrast Medium in 64-slice Spiral CT Angiography of Craniocervical Arteries

目的评价低剂量对比剂在头颈部CT血管联合成像中的动脉分级能力及图像质量效果。资料与方法搜集1183例行64排CT头颈部血管联合成像患者的资料,按对比剂注射剂量不同将患者分为低剂量组(n=708)和常规剂量组(n=475)。观察容积重建图像上患者颈总动脉、颈内动脉颈段、颈内动脉岩骨段至颅内段、大脑前动脉及其主要分支血管的显示情况,根据最大密度投影上血管质量评分判定图像质量。结果两组头颈部动脉血管及脑内较大分支在容积重建图像上显示良好,且最大密度投影图像上多数血管显示清晰,边缘光滑锐利。低剂量组和常规剂量组各段血管的显示率及图像质量评分差异均无统计学意义(P>0.05)。结论低剂量对比剂在CT头颈部联合成像上可以很好地显示颅内血管,且具有较高的图像质量。

Purpose To assess the effect of low dose contrast medium in arteries grades and the scoring of image quality in CT angiography of craniocervical arteries. Materials and Methods Imaging data of 1183 patients with 64-slice spiral CT angiography of craniocervical arteries were randomly divided into two groups： low dose contrast medium group （708 cases） and conventional dose contrast medium group （475 cases）. Display of the vessels on volume rendering images were observed, including common carotid arteries, cervical segment of internal carotid arteries, petrous segment to cerebral segment of internal carotid arteries, anterior cerebral arteries and their main branches. The image quality was evaluated on maximum intensity projection images. Results The craniocervical arteries and greater rami of cerebral arteries of the two groups were well displayed on volume rendering images. On maximum intensity projection, most of the arteries showed clearly with glabrous and sharp borders. There was no significant difference in revealing rate of arteries grades and image quality scores between the two groups （P0.05）. Conclusion Low dose contrast medium of CT angiography can display craniocervical arteries and the intracranial arteries very well with high image quality.