双源超高分辨率CT中小视野重建对改善耳蜗内电极显示的价值  

The value of small FOV reconstruction on dual-source ultrahigh resolution CT for improving cochlear electrode display

作　　者：胡文 郝跃文 HU Wen;HAO Yue-wen(Imaging Department of Xi'an Children's Hospital,Xi’an 710003,China)

机构地区：[1]西安市儿童医院影像科,西安710003

出　　处：《放射学实践》2023年第6期769-773,共5页Radiologic Practice

基　　金：西安市面上培育项目“基于多模态影像组学的神经母细胞瘤预后预测模型的研究(2021ms15)”。

摘　　要：目的:探讨双源超高分辨率CT中小FOV重建对提高耳蜗内电极显示的意义。方法:搜集本院行人工耳蜗植入术患儿30人(36耳),均于术后1周内行双源超高分辨率CT扫描。图像仅调整FOV大小进行重建,分别得到A组(FOV=140 mm×140 mm)、B组(FOV=90 mm×90 mm)和C组(FOV=50 mm×50 mm),其余重建参数不变。利用耳蜗坐标系统进行统一的后处理重建。由两位医生盲法决定每组图像曲面重建(CPR)上电极的可见性评分,感兴趣区置于耳蜗底转平面最内侧骨蜗管,测量其标准差(SD)评估噪声,比较3组的电极评分和SD。结果:A组、B组和C组图像的像素大小分别为0.14 mm×0.14 mm、0.09 mm×0.09 mm、0.05 mm×0.05 mm,而SD分别为(179.1±17.6)HU,(261.5±20.8)HU,(337.1±21.7)HU。图像的空间分辨率依次增加,噪声也显著增加(P<0.05)。两名医师的电极评分一致性良好(κ=0.82)。B组和C组中电极评分2分的比例相似(分别为61.1%和66.7%),而A组中电极评分多为0分(63.9%)。Kruskal-Wallis检验结果表明3组电极评分有差异(H=62.408,P<0.001)。两两比较A组与B组、A组与C组之间电极评分均存在显著差别(调整后P<0.001),而B组与C组之间电极评分无差别(调整后P=1)。结论:小FOV重建会增加图像噪声,但得益于耳颞部良好的密度对比度,可以利用它来提高电极的显示。Objective:To investigate the significance of small FOV reconstruction on dual source ultrahigh resolution CT for improving cochlear electrode display.Methods:Thirty children(36 ears)who underwent cochlear implantation in our hospital were enrolled and received dual-source ultrahigh resolution CT scans within one week after surgery.Group A(Fov=140mm×140mm),group B(Fov=90mm×90mm)and group C(Fov=50mm×50mm)were obtained by adjusting the size of FOV,and other reconstruction parameters remained unchanged.A uniform postprocessing reconstruction was performed using the cochlear coordinate system.The visibility scores of the electrodes on the image surface reconstruction(CPR)were determined by two physicians blinded to each group,the area of interest was placed in the medialmost ossicular canal in the cochlear floor turning plane,and the noise was assessed by measuring its standard deviation(SD),comparing the electrode scores and SD of the three groups.Result:The pixel sizes of group A,group B and group C were 0.14mm×0.14mm,0.09mm×0.09mm,and 0.05mm×0.05mm,respectively,and the SDs were(179.1±17.6)HU,(261.5±20.8)HU and(337.1±21.7)HU,respectively.The spatial resolution of the image increased successively,and the noise also increased significantly(P<0.05).There was good agreement between the electrode scores of the two physicians(κ=0.82).The proportion of electrode score 2 in groups B and C was similar(61.1%and 66.7%,respectively),while the electrode score in group A was mostly 0(63.9%).The Kruskal-Wallis test results showed a difference in electrode scores between the three groups(H=62.408,P<0.001).In the two-by-two comparison,there were significant differences in electrode scores between group A and group B and between group A and group C(all adjusted P<0.001),whereas there were no differences in electrode scores between group B and group C(adjusted P=1).Conclusion:Small FOV reconstruction would increase image noise,but it could be used to improve the electrode display due to the good density contrast of the auric

关 键 词：体层摄影术 X线计算机 图像质量 耳蜗植入术 视野 

分 类 号：R814.4[医药卫生—影像医学与核医学] R814[医药卫生—放射医学] R764.93[医药卫生—临床医学] R339.145