Estimation of tendon moment arms from three-dimensional magnetic resonance images.
Estimation of tendon moment arms from three-dimensional magnetic resonance images.
复制标题
从三维磁共振图像估计肌腱力臂。
DOI：
10.1114/1.180
复制
发表时间：
1999
影响因子：
3.8
通讯作者：
Crago,PE
中科院分区：
文献类型：
--
作者：
Wilson,DL;Zhu,Q;Duerk,JL;Mansour,JM;Kilgore,K;Crago,PE
创建了用于测量肌腱力臂的新三维 (3D) 磁共振成像 (MRI) 方法，并在第三掌指关节的指深屈肌的肌腱力臂上进行了评估。使用开放式磁体 MRI 系统和手持器，在四个关节角度采集一系列静态图像，并使用专门创建的计算机程序进行分析。评估了三种方法：（1）扩展了 Landsmeer 方法的 3D 肌腱偏移方法； (2) 3D 几何方法，其中力臂是关节旋转轴和肌腱路径之间的垂直距离，以及 (3) 二维 (2D) 几何方法，其中分析单个图像切片。重复成像和测量过程，3D 肌腱偏移方法的可重复性（6% 变化）比 3D 几何方法 (12%) 的可重复性更高，并且两者都比 2D 几何方法 (27%) 的可重复性更高。通过让三个操作员分析一组图像数据，我们发现 3D 肌腱偏移方法的精度受分割误差的影响比 3D 几何方法小得多。通过 3D 成像方法，肌腱拉弦和关节旋转中心向手背侧的位移是明显的，导致关节屈曲时力臂增加多达 60%。由于受试者之间对屈曲和变化的依赖性，我们建议针对功能性神经肌肉刺激干预和肌腱转移手术中的目标应用进行针对患者的特定测量。 ©1999 生物医学工程学会.PAC99: 8761Pk, 8719Rr, 0705Pj
New three-dimensional (3D) magnetic resonance imaging (MRI) methods for measuring the tendon moment arm were created and were evaluated on the tendon moment arm of the flexor digitorum profundus at the third metacarpophalangeal joint. Using an open magnet MRI system and a hand holder, a series of static images were acquired at four joint angles and analyzed using specially created computer programs. Three methods were evaluated: (1) a 3D tendon excursion method that extended the method of Landsmeer; (2) a 3D geometric method whereby the moment arm was the perpendicular distance between the joint axis of rotation and the tendon path, and (3) a two-dimensional (2D) geometric method whereby single image slices were analyzed. Repeating the imaging and measurement processes, the 3D tendon excursion method was more reproducible (6% variation) than the 3D geometric method (12%), and both were much more reproducible than the 2D geometric method (27%). By having three operators analyze a single set of image data, we found that the precision of the 3D tendon excursion method was much less affected by segmentation error than the 3D geometric method. With the 3D imaging methods, tendon bowstringing and a displacement of the joint center of rotation toward the dorsal side of the hand were evident, leading to as much as a 60% increase in moment arm with joint flexion. Because of the dependence on flexion and variation between subjects, we recommend patient-specific measurements for target applications in functional neuromuscular stimulation interventions and tendon transfer surgery. ©1999 Biomedical Engineering Society.PAC99: 8761Pk, 8719Rr, 0705Pj