正常人颈脊髓矢状径MRI测量

Sagittal diameters measurements on MR of the cervical spinal cord in normal subjects

目的提供颈脊髓矢状径、颈椎管有效矢状径（脑脊液柱矢状径）正常参考值，筛选出较科学的评估颈脊髓病的影像学标准。方法在120例正常人颈椎MRI片上，对各节段颈脊髓矢状径、颈椎管有效矢状径、M值（桥脑-延髓交界处矢状径）进行测量，计算脊髓矢状径与椎管有效矢状径比值，以及脊髓矢状径和M值的比值（C／M值），研究它们与性别、年龄和颈椎长度的相关性。评估脊髓矢状径与椎管有效矢状径比值和C／M值的临床应用价值。结果脊髓矢状径、椎管有效矢状径、M值男性大于女性（P〈0．05），脊髓矢状径和椎管有效矢状径比值和C／M值男女无差别（P〉0．05）。颈脊髓矢状径和M值随着颈椎长度的增加而增加（r=0．215，P=0．010；r=0．151，P=0．020）。颈脊髓矢状径和颈椎管有效矢状径比值与年龄成呈相关（r=0．242，P〈0．01），与颈椎长度无明显相关（r=0．082，P=0．200）。C／M值与年龄和颈椎长度均无相关性（r=0．06，P=0．359；r=0．003，P=0．900）。结论C／M值能够很好评价颈脊髓萎缩、受压、损害的状况，它很少受到个体差异的影响，是临床评估颈脊髓疾病的良好标准之一，

Objective To offer normal reference of diameter of the cervical spinal cord and available diameter of cervical spinal canal and to screen scientific radiographic criteria to define and quantify cervical spinal cord disease. Methods The magnetic resonance images of 120 normal people had been measured. The data of diameters of cervical spinal cord, CSF, M, the ratio of diameters of cord and CSF, and the ratio of diameters of cord and M had been collected and statistical analysis was made. And the relationships between the data above and each of gender, the length of C-spine and age were evaluated. In addition, the ratio of diameters of cord and CSF, and the ratio of diameters of cord and M was evaluated. Results The study showed that in healthy people, the diameters of cervical spinal cord, CSF and M was larger in the males than in the females, decreased with age, and increased with the length of C-spine but the diameter of CSF. And the ratio of diameters of cord and CSF increased with age and not affected by the length of C-spine. However, the ratio of diameters of cord and M was not affected by age and the length of C-spine. Conclusion The ratio of diameters of cord and M is not affected by individual variation and can be used to evaluate cervical spinal cord atrophy, compression and impaired in patients with cervical myelopathy and can be important information in looking for clinically critical points.