The evaluation of circle of willis detected by 3D-TOF MRA in unilateral internal carotid artery occlusion patients

PANG Libo; YANG Benqiang; DUAN Yang

Abstract：Objective Via analyzing the type of circle of willis by 3D-TOF MRA,to investigate clinical significance of collateral circulation of circle of willis in patients with interal carotid artery occlusion.Methods 1439 patients were subjected to 3D-TOF MRA on head and,meanwhile,underwent the examination of MR plain scan and diffusion imaging.Of those patients,845 were male and 594 were female,aged from 23 to 89 years old,with an average of (57.1 ± 9.5) years.The original images of 3D-TOF MRA were reconstructed.Results In this work,type] (circle of willis) accounted for 47.46％ (683 cases),type Ⅱ accounted for 38.71％ (557 cases),type Ⅲ accounted for 6.25％ (90 cases),and type Ⅳ accounted for 7.57％ (109 cases).There were 60 cases of intracal interal carotid artery occlusion,30 cases were type Ⅰ (circle of willis),21 cases were type Ⅱ,3 cases were type Ⅲ,6 cases were type Ⅳ.53 cases were acute stage infarction,among which 16 presented with a large area infarction,22 with watershed infarction,15 with small focus infarction,7 with negative acute stage lesion,and 2 with piamater arterial anastomosis.In a large area infarction cases,5 cases were type Ⅰ (circle of willis),6 cases were type Ⅱ,0 was type Ⅲ,and 5 were type Ⅳ.Conclusion 3D-TOF MRA can provide reference for the relation of clinical evaluation of circle of willis type and the change of collateral circulation of circle of willis in interal carotid artery occlusion with cerebral infarction degree.