I. Introduction
Current noninvasive examination of tendon pathology is mostly based on subjective judgment of the physician after examination of the ultrasound or MRI images of the tendon. MRI provides high-quality images but is not as easily accessible and is relatively expensive compared to ultrasound [1]–[3]. Moreover, MRI images are generally static. Ultrasound provides high-resolution, high frame rate imaging that can be used to examine dynamic behavior of the tendon in real time. Therefore, ultrasound is a natural choice for motion analysis [4]–[7].