摘要
目的研究能谱CT多伪影去除(Multi-Artifact Reduction,MAR)技术在内固定植入术后去金属伪影的效果,分析MAR技术所获取的组织CT值是否真实,同时分析联合CT硬件增强(CT Hardware Enhanced)VR降伪影法重建较常规重建对金属植入物的显示价值。方法回顾性收集我院2021年7—11月行能谱CT金属植入物检查的患者共42例,获取其能谱CT data数据,分别重建出加MAR和不加MAR两组数据用于后处理分析。对两组数据分别进行三维重建包括常规容积再现(Volume Rendering,VR)、多平面重建(Multi Planar Reformation,MPR)和VR降伪影法重建,比较MAR组和不加MAR组在金属伪影层面的伪影长度;将两组图像在金属伪影层面骨骼及肌肉的CT值和信噪比(Signal to Noise Ratio,SNR)与无伪影层面对应的骨骼及肌肉的CT值和信噪比进行对比,分析采用VR降伪影技术重建与常规三维重建的显示效果。结果主观评价MAR组图像评分为4(4,5)分,不加MAR组图像评分为1(1,2)分,两名医生评分一致性较好(Kappa=0.766、0.787);客观评价MAR组图像在伪影层面显示伪影长度较不加MAR组图像明显缩短,差异有统计学意义(P<0.001),且组织CT值及SNR更接近无伪影层面相对应组织;联合VR降伪影技术重建较常规三维重建对金属植入物的显示更清晰。结论能谱CT联合MAR技术可以有效去除金属伪影,在金属伪影层面显示组织CT值更加真实准确,SNR更高,联合使用VR降伪影技术行三维重建能更好地显示金属植入物的情况。
Objective To study the effect of energy spectral CT multi-artifact reduction(MAR)on metal artifact removal after internal fixation implantation,analyze whether the tissue CT values obtained by MAR technology are true,and the display value of metal implants by MAR and CT hardware-enhanced VR artifact-reduced reconstruction is compared with conventional reconstruction.Methods A total of 42 patients who underwent energy spectral CT metal implant examinations in our hospital from July to November 2021 were retrospectively collected,and their energy spectral CT data were obtained.Data of two groups with and without MAR were reconstructed respectively for post-processing analysis.3D reconstruction including conventional volume rendering(VR),multi-planar reformation(MPR)and VR artifact reduction method reconstruction was performed on both groups to compare the MAR group and no MAR group in the level of metal artifacts.The CT values and signal to noise ratio(SNR)of bones and muscles at the metal artifact level and the non-artifact level were compared.The display effect of reconstruction using VR artifact reduction technology and conventional 3D reconstruction were also compared and analyzed.Results The image score of the subjective evaluation was 4(4,5)in the MAR group,and 1(1,2)in the n on-MAR group.The two doctors had a good consistency(Kappa=0.766,0.787).The objective evaluation of the images in the MAR group showed that the length of the artifacts at the artifact level was significantly shorter than that of the non MAR group,and the difference was statistically significant(P<0.001),and the tissue CT value and SNR were closer than the corresponding tissue at the non-artifact level.Compared with conventional 3D reconstruction,the reconstruction combined with VR artifact reduction technology could display the metal implants more clearly.Conclusion Energy spectral CT combined with MAR can effectively remove metal artifacts,and the CT value of tissue displayed at the metal artifact level is more real and accurate,and the SNR is higher;meanwhile,the 3D reconstruction combined with VR artifact reduction technology can better display the metal implants.
作者
姬龙
余娜
苟瀚恒
何长清
周代全
JI Long;YU Na;GOU Hanheng;HE Changqing;ZHOU Daiquan(Department of Radiology,The Third Affiliated Hospital of Chongqing Medical University,Chongqing 401120,China)
出处
《中国医疗设备》
2022年第8期177-182,共6页
China Medical Devices
基金
重庆市临床重点专科建设项目(SLZCDZK202202)。
关键词
能谱CT
金属伪影去除技术
VR降伪影技术
金属植入物
三维重建
energy spectral CT
metal artifact reduction technology
VR artifact reduction technology
metal implants
3D reconstruction
