Inclusion Criteria:  (Prospective part) compliance to MRI scan (Prospective part) no MRI contraindication (Retrospective part) available conventional MRI data clinical diagnosis of SCI (the course of disease≥1 year)  Exclusion Criteria:  prior head or neck surgery or accompanying diseases with neurologic deficits and/or symptoms including multiple sclerosis, motor neuron disease, or spinal cord tumor images with motion artifact