MRI is of great value in diagnosis of head, spine, and spinal cord diseases. The diagnosis for joint parenchyma trauma such as meniscus, cruciate ligament injury is better than CT scans. It also has great value in diagnosis of otolaryngologic disease, heart disease, mediastinal mass, osteoarthrosis, muscle disease, abdominal organ (such as liver, spleen, pancreas, kidney, adrenal gland) and pelvic organ(such as uterus, ovary, bladder, prostate) lesion. MRI is also of significant value in early diagnosis in prostate cancer and has no radiation injury on the human body.