论文部分内容阅读
目的 探讨三维质子密度不同翻转角步进最佳对比应用完善取样(3D PD-SPACE)序列评估正常膝后外侧角(PLC)韧带结构的价值,提高对相应结构的认识.方法 35名无症状志愿者行常规3个平面二维质子密度加权(2D PDWI)序列及3D PD-SPACE序列检查,采用4分法评价2个序列显示正常PLC的外侧副韧带、腘腓韧带、弓状韧带和小豆腓骨韧带的价值.结合薄层原始图像和多向调整多平面重组(MPR)分析各韧带的MRI表现和解剖学参数.结果 3D PD-SPACE序列显示外侧副韧带、胭腓韧带、弓状韧带和小豆腓骨韧带的评分均优于2D PD-WI序列(P均＜0.05).3D PD-SPACE序列多向调整MPR对外副韧带、腘腓韧带、弓状韧带、小豆腓骨韧带的显示率分别为100％(35/35)、100％ (35/35)、74.3％ (26/35)和51.4％ (18/35).正常外侧副韧带的长度、宽度和厚度分别为(51.6±7.5)mm、(4.0±1.0)mm及(4.9±1.2)mm,腘腓韧带为(13.8±2.6)mm、(8.5±3.7)mm及(2.6±0.49) mm,弓状韧带中部分别为(20.9 ±5.8)mm、(12.2±2.8)mm及(2.0 ±0.72) mm,小豆腓骨韧带则为(32.3±5.6)mm、(2.4 ±0.58)mm及(1.4±0.26)mm;各韧带不同性别间和左右间差异无统计学意义(P均＞0.05).结论 3D PD-SPACE序列结合多向调整MPR能准确显示PLC小韧带的解剖形态,是评估该类结构的有效手段.“,”Objective To evaluate the utility of the 3D PD-SPACE sequence in normal ligaments of posterior lateral comer of knee.Methods 2D PDW1 and 3D PD-SPACE images were obtained in 35 asymptomatic volunteers.The scores of 4 ligaments (the lateral collateral ligament,popliteofibular ligament,arcuate ligament and fabellofibular ligament) were used to compare the diagnostic performance of SPACE with that of 2D PDWI.MRI features and anatomic parameters of each ligament were analyzed with the combination of thin original images and multidirection adjusted muhiplanar reconstruction.Results The scores for ligaments display efficiency of 3D PD-SPACE images were better than 2D PDWI sequence(all P ＜0.05).In the images of 3D PD-SPACE sequence and multidirection adjusted multiplanar reconstruction,the lateral collateral ligament and popliteofibular ligament could be displayed in all cases,arcuate ligament and fabellofibular ligament could be seen in 74.3％ (26/35) and 51.4％ (18/35) cases.The length,width and thickness of normal lateral collateral ligament were (51.6 ± 7.5) mm,(4.0 ± 1.0) mm and (4.9 ± 1.2) mm respectively,which were (13.8 ± 2.6) mm,(8.5 ±3.7) mm and (2.6 ±0.49) mm in popliteofibular ligament,(20.9 ±5.8) mm,(12.2 ±2.8) mm and (2.0 ±0.72) mm in arcuate ligament,and (32.3 ± 5.6) mm,(2.4 ± 0.58) mm and (1.4 ± 0.26) mm for fabellofibular ligament.There were no significant differences between different gender and different sides (all P ＞ 0.05).Conclusion The 3D PD-SPACE sequence combining multidirection adjusted multiplanar reconstruction can intactly display the small ligament structures of posterolateral corner.