去金属伪影技术在骨科金属植入物术后计算机断层扫描图像中的应用

发布时间：2018-02-13 04:53

本文关键词： 去金属伪影技术计算机断层扫描图像质量评价　出处：《上海医学》2017年03期 　论文类型：期刊论文

【摘要】：目的探讨去金属伪影(MAC)技术在骨科金属植入物术后CT检查中的应用价值。方法收集2014年11月—2015年9月间40例在行骨科金属植入物术后接受16排CT扫描检查的患者资料,对其同一扫描的原始数据,分别采用设备自带的标准滤波反投影重建算法(常规重建组)和MAC技术的去金属伪影重建法(MAC重建组)进行图像后处理。由3名有经验的放射科医师采用双盲法对两组图像质量进行客观、主观评价,客观评价指标包括图像噪声值(SD)、信噪比(SNR)、对比噪声比(CNR),主观评价采用5分赋值法。结果 MAC重建组CT图像的SNR、CNR均显著大于常规重建组(P值均0.01),金属植入物相邻肌肉的噪声值(SD1)、相同测量层面皮下脂肪的噪声值(SD2)均显著小于常规重建组(P值均0.01)。MAC重建组的主观评价评分为(4.37±0.20)分,显著高于常规重建组的(2.45±0.15)分(P0.01)。3名放射科医师CT图像质量主观评价的一致性良好(Kappa值=0.89)。与常规重建组多平面重建(MRR)模式的冠状位CT图像和容积再现(VR)模式重建图像相比,MAC重建组图像的伪影对周围组织的干扰明显减小,能够清晰地观察金属植入物周围的骨质、软组织情况,图像噪声明显降低。结论 MAC技术能显著消除金属伪影,提高金属植入物受检部位CT图像的质量,且周围软组织清晰可见,该技术对骨科金属植入物术后CT图像分析具有良好的临床应用价值。
[Abstract]:Objective to evaluate the value of metal removal artifact (Marc) technique in CT examination after orthopedic metal implants. Methods 40 patients undergoing 16 row CT scan after orthopedic metal implants from November 2014 to September 2015 were collected. Raw data for the same scan, Standard filter back-projection reconstruction algorithm (conventional reconstruction group) and de-metal artifact reconstruction method (MAC technique) were used for image post-processing respectively. Three experienced radiologists used double-blind method. The quality of the two groups of images is objective, Subjective evaluation, Objective evaluation indexes included image noise value, SNR and SNR ratio. Subjective evaluation was performed by 5 points assignment method. Results the SNR of MAC reconstruction group was significantly higher than that of conventional reconstruction group (P < 0.01), and the adjacent muscles of metal implants were significantly higher than those of conventional reconstruction group (P < 0.01). The noise value of meat and the noise value of subcutaneous fat measured on the same level were significantly lower than those of the conventional reconstruction group (P = 0.01) and the subjective evaluation score of MAC reconstruction group was 4.37 卤0.20, respectively. It was significantly higher than that of conventional reconstruction group (2.45 卤0.15). The consistency of subjective evaluation of CT image quality of 3 radiologists was good. The Kappa value was 0.890.It was higher than that of conventional reconstruction group by coronal CT and volumetric reconstruction with VRR. Compared with MAC reconstruction group, the artifacts of the reconstructed group obviously reduced the interference to the surrounding tissues. It can clearly observe the bone and soft tissue around the metal implants, and the image noise is obviously reduced. Conclusion MAC technique can significantly eliminate metal artifacts and improve the quality of CT images of metal implants. And the surrounding soft tissue is clearly visible. This technique has a good clinical value in the analysis of CT images after orthopedic metal implants.
【作者单位】：同济大学附属第十人民医院放射科;上海联影医疗科技有限公司;
【分类号】：R687;R816.8

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