Extraction of Sartorius Muscle with Tendon Attachment Sites from MR Images by Using Active Shape Model

In this paper, a new approach for segmentation of sartorius muscle (M. sar.) with the tendon attachment sites (TAS) from 3D Magnetic Resonance (MR) Images is presented. The segmented muscle is used in a human gait modeling software. By means of the modeling, the cause of gait pathologies could be diagnosed. In this approach, three Active Shape Models (ASM) are employed. Two of them are 2D models of cross section of bones which contain the begin and the end positions of M. sar and they are used to obtain the vertical span length (VSL) of the muscle. The third one is a 3D model of the M. sar. which is adopted for muscle segmentation via the model-based active contour method. Comparing the results of our approach with manual segmentation by a specialist, the mean deviation of the extraction of TAS position is 4.7 mm and the accuracy of muscle segmentation is 82%.