MAR算法在CT模拟机金属伪影去除中的实验研究

Experimental Study of MAR Algorithm in Metal Artifact Removal of CT Simulator

目的探讨MAR算法在CT模拟机金属伪影去除中的应用价值。方法采用实验扫描带有钛板的CT模体,分别使用常规算法和MAR算法对模体进行扫描。使用伪影指数(AI)、对比噪声比(CNR)和各层面AI值变化情况等客观指标对伪影图像进行统计分析。结果在伪影指数指标中,MAR算法(10.28±2.60)明显低于常规算法(20.65±5.04);在对比噪声比指标中,MAR算法(7.81±1.12)优于常规算法(5.61±1.36);上述指标在两种算法中均有统计学意义(P<0.01)。受伪影影响的层面中,MAR算法使用前后AI指数下降21.72%~88.40%。结论MAR算法可以明显减少CT模拟机扫描的金属伪影,同时明显提高CT数据的临床价值。

Objective To explore the application value of MAR algorithm in metal artifact removal of CT simulator.Methods CT phantom with titanium plate was scanned using conventional algorithms and MAR algorithms,respectively.Artifact index(AI),contrast-to-noise ratio(CNR)and AI values at different slices were used to analyze the artifact images.Results In artifact index,MAR algorithm(10.28±2.60)is significantly lower than conventional algorithm(20.65±5.04);In contrast-to-noise ratio index,MAR algorithm(7.81±1.12)is better than conventional algorithm(5.61±1.36).The above indicators were statistically significant in both algorithms(P<0.01).In the slices affected by metal artifacts,the artifact index decreased by 21.72%~88.40%after the MAR algorithm.Conclusion MAR algorithm can significantly reduce the metal artifacts and improve the clinical value of CT data.