甲状腺动脉多层螺旋CT血管成像

Angiography of Thyroid Arteries on Multislice Helical CT

目的:探讨CT血管成像显示甲状腺动脉的能力。方法:20例颈部无明显异常的受试者行16层螺旋CT动脉期增强扫描,采用容积再现(VR)、最大密度投影(MIP)等方法进行图像后处理,观察甲状腺动脉的显示情况。结果:双侧甲状腺上动脉主干共40支均清晰显示,起自颈外动脉起始部占50%、颈动脉分叉平面占30%、颈总动脉终末端占20%。喉上动脉在VR图像上显示率为25%,MIP图像为35%;甲状腺上动脉的2个终末支中前支在VR和MIP图像上显示率均显示,后支在VR图像上的显示率为60%,MIP图像上显示率为72.5%。甲状腺下动脉在VR图像上的显示率为65%,在MIP图像上为72.5%。甲状腺最下动脉未显示。结论:16层螺旋CT血管成像能满意显示甲状腺动脉的起源、走行、分布及变异情况。

Objective：To study the ability of multislice helical CT angiography showing thyroid arteries. Methods： Twenty cases with normal neck region were scanned using 16 slice helical CT with bolus tracking during arterial phase. The reconstructed data of arterial phase was used to reform thyroid arteries by volume rendering （VR） and maximum intensity projection （MIP）. The visualization of the reconstructed vessels was noted. Results：The bilateral superior thyroid arteries in all 20 cases were showed clearly. The cases that superior thyroid arteries arisen from the onset of external carotid artery were 50 %, the cases from the carotid artery bifurcation were 30 % and the cases from the end of common carotid artery were 20%. The cases that the superior laryngeal arteries were demonstrated were 25% on VR and 35% on MIP. In the two end branches of superior thyroid arteries,all anterior branches of them were demonstrated clearly on VR and MIP,and the cases that the posterior branches of them were demonstrated were 60% on VR and 72.5% on MIP. The cases that the inferior thyroid arteries were demonstrated were 65% on VR and 72.5% on MIP. The lowest thyroid arteries were not showed. Conclusion： It is available to get satisfactory images of the thyroid arteries by using multislice helical CT angiography. The origin,course,distribution and variation of them can be demonstrated.