Micro-CT中椎弓根螺钉伪影对其周围骨计量学检测结果的影响及其校正  

Influence and Calibration Pedical Screw Artifact on Peri-screw Bone Analysis by Micro-CT

作　　者：石磊[1,2] 王陵[1] 王军[1] 张扬[1] 雷伟[1] 

机构地区：[1]第四军医大学,西安710032 [2]济南军区总医院,济南250031

出　　处：《医疗卫生装备》2011年第12期60-61,76,共3页Chinese Medical Equipment Journal

基　　金：国家高技术研究发展计划(863计划)项目(2007AA02Z468)

摘　　要：目的:减少椎弓根螺钉伪影对其周围骨计量学结果的影响。方法:通过在绵羊腰椎内植入椎弓根螺钉后,行去钉扫描和带钉扫描后,以去钉扫描组为对照组,带钉扫描组为实验组,分别采用不同的分割阈值对实验组螺钉周围骨质进行图像重建分析,结果与对照组钉道周围骨质情况进行比较,观察不同分割阈值对于减少螺钉伪影的影响及真实反映螺钉周围骨质情况的能力。结果:与对照组分割阈值为1 000时比较,当实验组分割阈值为1 000时,实验组螺钉周围骨量明显优于对照组钉道周围骨量(P<0.05);当实验组分割阈值为1 500时,2组之间无显著差异(P>0.05);当实验组分割阈值为2 000时,对照组钉道周围骨量明显优于实验组螺钉周围骨量(P<0.05)。结论:通过一定程度的提高分割阈值,有效地减少了螺钉伪影的影响,有利于准确了解螺钉周围骨质的情况。Objective To decrease the influence of the artifact of pedicle screw on the peri-screw bone analysis.Methods The pedicle screws were inserted into the lumbar vertebrae of the sheep,and the samples were scanned with screw and without screw.The samples with screws fell under the experimental group and the ones without screws under the control group.The scanning results with different segmentation thresholds in the experimental group were compared to those with threshold 1000 in the control group respectively.Results With the threshold 1000,the results of the experimental group were significantly better those of the control group（P0.05）,and with the threshold 1500,there were no statistical difference between the two groups（P0.05）,while with the threshold 2000,the results of the control group were significantly better than those of the experimental group（P0.05）.Conclusion The influence of the artifact of pedicle screw on the peri-screw bone analysis can be decreased through enhancing the threshold.

关 键 词：MICRO-CT 伪影 分割阈值 椎弓根螺钉 

分 类 号：R816.8[医药卫生—放射医学]