目的：探讨利用表面遮盖重建（ surface shaded display，SSD）进行头颈部CTA去骨成像的重建阈值设定。方法：选取在同一单位工作的30位体检人员，测定其颈椎平均CT值、L3～5椎体平均骨质密度（ bone mineral density，BMD），并以BMD值为参照，进行颈椎平均CT值、性别及年龄的两两对照及多元回归拟合，建立回归方程，与前期颅骨骨质密度研究结果进行比较。同时收集本院11例头颈部CTA检查患者的相关资料，将回归方程得到的预估CT值作为SSD重建的阈值进行去骨成像，评价去骨后的图像质量，验证其可行性。结果：经统计分析，颅骨与颈椎骨质密度相差过大，采用重建阈值最小化原则，利用颈椎CT值作为SSD重建的阈值进行去骨成像，所有患者图像质量评分均为5分，可视为去骨成功。结论：利用SSD重建进行头颈部CTA去骨成像的方法是可行的。%Objective:To investigate the threshold setting of boneless CTA for skull and neckwith surface shaded display technique.Methods:30 persons received physical examination andworked in the same unit.Their average CT values of skull and cervical spine and bone mineral density ( BMD) of L3~5 vertebrae were measured.Took the BMD value as a reference,average CT value of neck,the gender and age in the two groups were gotten and established a multiple regression equation for estimating the average CT value of skull on gender and age.Simultaneously, the previous skull bone density study results were compared with.Moreover,collected 11 cases of CTA examination in our hospital,the CT value was estimated with the equation and the SSD reconstruction threshold value for completing the boneless imaging,and the image quality and feasibility of boneless imaging were verified.Results:After statistical analysis,the skull and cervical spine bone mineral density difference were much large,the use of reconstruction threshold value minimization principle, cervical spine CT reconstruction SSD as a threshold value were used to boneless imaging,and the all of image quality scores are 5,which could be regarded as the boneless successful.Conclusion:It is feasible for using gender and age to estimate average CT value of the skull.
展开▼
