Ryu Jae Hun, Miyata Natsuki, Kouchi Makiko, Mochimaru Masaaki, Lee Kwan H
Intelligent Design and Graphics Laboratory, Department of Mechatronics, Gwangju Institute of Science and Technology (GIST), Puk-gu, Gwangju, Republic of Korea.
J Biomech. 2006;39(5):844-52. doi: 10.1016/j.jbiomech.2005.02.001.
This study describes the methodology for analyzing skin movement with respect to the predefined flexional motion of the hand. The 3D in vivo geometric data were acquired through magnetic resonance (MR) scanning of multiple hands in various postures. Custom software was developed to segment MR images and to generate polygonal isosurfaces. A new bone coordinate system (BCS) was defined to describe the skin movement measured with the skin-surface markers. The BCS was defined by the surface registration technique, which could minimize the distance among the 3D polygonal surfaces of different postures. MR images of six subjects in the 3 postures were captured with skin-surface markers for the experiment. Skin movement on the second metacarpal bone, which was fixed during the flexional motion, ranged from 1.169 to 10.885 mm. While the distance of the skin movement varied from one subject to another, a common skin movement direction was observed among the six subjects. For the repeatability evaluation of the proposed method, the MR images of the same subject were independently processed 10 times by a trained operator. The standard deviation of the skin movement on the second metacarpal of the index finger with respect to the predefined flexional motion ranged from 0.45 to 0.74 mm.
本研究描述了针对手部预定义屈曲运动分析皮肤运动的方法。通过对处于各种姿势的多只手进行磁共振（MR）扫描获取三维体内几何数据。开发了定制软件来分割MR图像并生成多边形等值面。定义了一种新的骨坐标系（BCS）来描述用皮肤表面标记测量的皮肤运动。BCS由表面配准技术定义，该技术可使不同姿势的三维多边形表面之间的距离最小化。对六名受试者在三种姿势下的MR图像进行了带有皮肤表面标记的实验拍摄。在屈曲运动过程中固定的第二掌骨上的皮肤运动范围为1.169至10.885毫米。虽然皮肤运动的距离因受试者而异，但在这六名受试者中观察到了共同的皮肤运动方向。为了评估所提方法的可重复性，由一名经过培训的操作人员对同一受试者的MR图像独立处理10次。食指第二掌骨上皮肤运动相对于预定义屈曲运动的标准偏差范围为0.45至0.74毫米。
