不同噪声指数与自适应统计迭代重建选择对双能CT测量腰椎骨密度的影响  

Effect of Different Noise Index and Adaptive Statistical Interactive Reconstruction-Veo Selection on Double Energy CT

作　　者：张晗 殷甜甜 杨秋实 王泽国 韩合理 郁万江[2] ZHANG Han;YIN Tiantian;YANG Qiushi;WANG Zeguo;HAN Heli;YU Wanjiang(Department of Radiology,Qingdao Municipal Hospital,Qingdao 266071,China)

机构地区：[1]潍坊医学院医学影像学院,山东潍坊261053 [2]青岛市市立医院影像科,山东青岛266071

出　　处：《中国医学影像学杂志》2024年第10期1069-1074,共6页Chinese Journal of Medical Imaging

摘　　要：目的基于欧洲腰椎体膜,分析不同噪声指数(NI)联合多模态自适应统计迭代重建算法(ASiR-V)权重对腰椎骨密度测量的影响,并探讨两个参数的最佳组合。资料与方法应用GE Revolution CT能谱成像对欧洲腰椎体模进行扫描。扫描条件:NI值为4~20(间隔2)联合多模态ASiR-V权重(0~100%,间隔20%)共54组。分别在L1、L2和L3正中间设置感兴趣区,选择羟基磷灰石-水(HAP-H_(2)O)基物质测量各椎体的HAP含量,比较在不同NI联合不同ASiR-V条件下骨密度测量值与真实值的差异,评价其准确性。结果54组扫描条件下,L1、L2、L3椎体HAP测值差异均有统计学意义(P均<0.001)。当NI=14、ASiR-V80%,NI=16、ASiR-V100%,NI=18、ASiR-V60%,NI=18、ASiR-V80%,NI=20、ASiR-V60%,NI=20、ASiRV80%,NI=20、ASiR-V100%时,HAP测值与体模真实值差异均无统计学意义(P>0.05)。结论在NI=18、ASiR-V60%的条件下,能谱CT可实现对腰椎骨密度的准确测量,并能够显著降低辐射剂量。在临床实际应用过程中,可根据实际情况适当提高NI、ASiR-V权重实现低剂量扫描测定骨密度值。Purpose Based on European lumbar spine phantom,to investigate the effect of different noise index(NI)combined with adaptive statistical interactive reconstruction-veo(ASiR-V)weights on the measurement of lumbar spine bone density,and to explore the optimal combination of the two parameters.Materials and Methods Using GE Revolution CT spectral imaging scanning,54 groups of scanning parameters with NI values of 4-20(interval 2)combined with ASiR-V weights of 0-100%(interval 20%)were selected for spectral scanning of European lumbar spine phantom.Regions of interest were placed in the middle of L1,L2 and L3,respectively.hydroxyapatite(HAP)-H_(2)O based substances were selected to measure the HAP content of each vertebral body.The differences between the measured bone density value and the true value under different NI combined with different ASiR-V were compared to evaluate its accuracy.Results There were statistically significant differences in HAP measurements of L1,L2 and L3 vertebra in 54 groups of scanning conditions(all P<0.001).When NI=14,ASiR-V80%;NI=16,ASiR-V100%;NI=18,ASiR-V60%;NI=18,ASiR-V80%;NI=20,ASiR-V60%;NI=20,ASiR-V80%;NI=20,ASiR-V100%,there was no statistically significant difference between HAP measured value and true body model value(P>0.05).Conclusion With NI=18,ASiR-V60%,spectral CT can accurately measure lumbar spine bone density and significantly reduce the radiation dose.In clinical application,bone density can be measured by low dose scanning by increasing the weight of NI and ASiR-V.

关 键 词：体模 体层摄影术 X线计算机 多模态自适应统计迭代重建 噪声指数 骨密度 

分 类 号：R445.3[医药卫生—影像医学与核医学] R336[医药卫生—诊断学]