Anatomic variations of Willis circle by 64-slice volume CT digital subtraction angiography
- VernacularTitle:Willis环解剖变异的64层容积CT数字减影血管造影研究
- Author:
Wenhao FANG
;
Fajin LU
;
Lijuan ZHANG
;
Peng XIE
;
Qi LI
- Publication Type:Journal Article
- Keywords:
Willis circle of;
anatomic variation;
CT angiography;
X-ray;
3-D reconstruction
- From:Journal of Third Military Medical University
2003;0(14):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the normal anatomy and variation of Willis circle by 64-slice volume CT digital subtraction angiography(VCTDSA).Methods VCTDSA data of 174 patients with cephalocervical and cephalic scanning in our hospital from February 2006 to September 2008 were analyzed.Developmental condition,shape,size,integrity,and perforating branches of Willis circle were observed.Results(1) Hypoplasia was displayed in any component vessels of Willis circle.Incidence rate of hypoplasia was 20.1% in left posterior communicating artery,16.1% in right posterior communicating artery,13.8% in right anterior cerebral artery A1,9.2% in right posterior cerebral artery P1,7.3% in anterior communicating artery,6.3% in left posterior cerebral artery P1,and 3.4% in left anterior cerebral artery A1.Congenital arterial absence occurred more frequently in right posterior communicating artery(54.6%),left posterior communicating artery(52.3%),and anterior communicating artery(15.8%).(2) Hypoplasia or congenital absence of posterior circulation and anterior-posterior circulation occurred with a rate of 55.8% and 29.8% respectively.Integrity of Willis circle was only 9.2%.There were 17 perforating branches and 26 heubner inversion arteries observed in 174 Willis circle,with an average diameter of 0.82 mm and 0.94 mm respectively.Conclusion VCTDSA can display Willis circle completely and clearly.Using three-dimensional rotation may detect all kinds of variation and perforating branches of Willis circle.
