以電腦斷層掃描自動量測運動中腕骨的質心距離

Abstract

腕部關節是由八塊腕骨所構成，彼此間的運動關係相當複雜。而過去對於 腕部的相關研究中，大部份是分析腕部靜止而呈現某種姿勢時，腕骨彼此 間的角度或是受力的情形，但是對於運動中的關係則尚未有系統的研究。 在本篇論文中，我們提出自動量測運動中半月骨及頭狀骨質心距離的方法 ，本方法結合靜態斷層掃描的完整性及動態掃描的時間性，整合影像處理 及空間座標轉換的技巧，將腕部進行伸展運動時，半月骨及頭狀骨間的質 心距離變化清楚的描述出來。此研究方法已在IRIS的系統中以C語言完成 實作，並且以實際例子進行測試，結果確實可以求出運動中質心的距離。 The wrist joint, although extremely mobile in all three plans of space, is neverthless able to support several times the bodyweight without damage. Its archchitecture, base on eight bones and a special ligamentous bonding,is very complex but guarantees stability under all circumstances. In the past, the researches on the biomechanics of the wrist were mainly based on the two dimensionalanalysis of positional changes of carpal bones. Three dimensional measurementof carpal bones during wrist motion were not elucidated. The purpose of this study is to develop a new system to elucidate this problem. In this study, we proposed a method to measure the movement between lunate and capitate. This method combines the information of both static computed tomography and uhe dynamic computed tomography, then integrate the image processing and coordinate translational technique. This method measure the dynamic distance between lunate and capitate automatically by implement on IRIS in C language. By using this method, we describe the changes in relative position in mass center of the lunat e and capitate during dynamic motion of the carpal bones.The changes in relative position of mass center clearly represent the motion of carpal bones durion wrist movement. Experiment result how that the method can measure the dynamic distance of carpal bones correctly. The method has a great potential on the s tudy of the wrist biomechanics.