Torticollis is a clinical sign or symptom that could be the result of a variety of underlying disorders. Among the etiologies, Congenital muscular torticollis (CMT) with impairment of the sternocleidomastoid (SCM) is the most frequent cause of torticollis in infants. CMT is a postural deformity detected at birth or shortly after birth, primarily resulting from unilateral shortening and fibrosis of the SCM. Infants with CMT display head tilt to one side, which is often combined with rotation of the head to the opposite side. In 2002, Chih-Chin Hsu et al. reported that CMT could be classified into four types. The majority of Type I and II fibrosis improved after conservative treatment. However, Type III and Type IV had more probability in need of surgical correction. However, this categorization lacks of objective and quantitative measurement and can be different by subjective judgement of different physicians. The purpose of this study is tried to perform digital analysis of ultrasonography images to establish an objective, quantitative method and to assess its relevance with clinical symptoms and prognosis.