正常成人腮腺导管结构磁共振涎管造影成像初步评估

Evaluation of the Normal Structures of Parotid Duct Using Magnetic Resonance Hydrography

目的通过磁共振水成像技术探索正常腮腺导管的结构参数。方法采用磁共振三维重T2加权成像对21名正常受试者进行腮腺导管水成像。受试者口服维生素C 200 mg,含药3 min后行冠状位磁共振腮腺导管水成像,将图像传至GE AW4.5工作站,采用Functool软件进行多平面重建,观察腮腺导管、副导管、节段及分支数量,并对腺体内、外导管长度、直径进行测量。结果21名正常受试者中24个腮腺出现副导管,占57.1%(24/42),平均长度(9.54±9.98)mm,平均直径(0.87±0.88)mm。腺体内导管观察到3个节段3例,占7.14%(3/42),2个节段19例,占45.23%(19/42),1个节段20例,占47.62%(20/42)。第1节段平均分支数量2.38个,第2节段平均分支数量0.88个,第3节段平均分支数量0.1个。腺体内导管平均长度为(36.97±7.97)mm,平均直径为(2.01±0.76)mm,腺体外导管平均长度为(34.98±10.25)mm,平均直径为(2.13±0.79)mm。腮腺导管总长度平均为(71.95±11.47)mm,平均直径为(2.07±0.68)mm。结论磁共振水成像可以精确显示腮腺导管、副导管、节段及分支数量,并可进行量化评估。

Objective To investigate the normal structures of parotid duct by using magnetic resonance(MR)hydrography.Methods MR three-dimensional heavy T2-weighted imaging was performed in 21 normal subjects.After taking 200 mg of vitamin C orally for 3 minutes,the subjects underwent parotid duct coronal hydro-magnetic resonance imaging.The images were transferred to the GE AW4.5 workstation,on which multi-planner reformation was performed using Functool software.The numbers of the parotid duct,accessory parotid duct,segments,and its branches was counted and the length and diameter of the intra-and extra-parotid ducts were measured.Results Accessory ducts were found in 24 parotid glands(57.1%,24/42),with the average length being(9.54±9.98)mm and the average diameter being(0.87±0.88)mm.The intra-parotid ducts were found to be with 3 segments were in 3 cases(7.14%,3/42),with 2 segments in 19 cases(45.23%,19/42),and with 1 segment in 20 cases(47.62%,20/42).The average number of the branches of the first,second and third segment was 2.38,0.88,and 0.1,respectively.The average length of the intra-parotid duct was(36.97±7.97)mm,with its average diameter being(2.01±0.76)mm.The average length of extra-parotid duct was(34.98±10.25)mm,with its average diameter being(2.13±0.79)mm.The average length of the whole parotid duct was(71.95±11.47)mm,with its average diameter being(2.07±0.68)mm.Conclusion The parotid duct,the accessory parotid duct,and the segments and their branches of the intra-parotid duct can be accurately displayed by MR hydrography.