A metal implant was placed in an acrylic phantom to enable quantitative analysis of the metal artifact reduction techniques used in computed tomography (CT) scanners from three manufacturers. Two titanium rods were placed in a groove in a cylindrical phantom made by acrylic, after which the groove was filled with water. The phantom was scanned using three CT scanners (Toshiba, GE, Siemens) under the abdomen CT setting. CT number accuracy, contrast-to-noise ratio, area of the metal rods in the images, and fraction of affected pixel area of water were measured using ImageJ. Different iterative reconstruction, dual energy, and metal artifact reduction techniques were compared within three vendors. The highest contrast-to-noise ratio of three scanners were 85.7 ± 8.4 (Toshiba), 85.9 ± 11.7 (GE), and 55.0 ± 14.8 (Siemens); and the most correct results of metal area were 157.1 ± 1.4 mm² (Toshiba), 155.0 ± 1.0 (GE), and 170.6 ± 5.3 (Siemens). The fraction of affected pixel area obtained using single-energy metal artifact reduction of Toshiba scanner was 2.2% ± 0.7%, which is more favorable than 4.1% ± 0.7% obtained using metal artifact reduction software of GE scanner (p = 0.002). Among all quantitative results, the estimations with fraction of affected pixel areas matched the effect of metal artifact reduction in the actual images. Therefore, the single-energy metal artifact reduction technique of Toshiba scanner had a desirable effect. The metal artifact reduction software of GE scanner effectively reduced the effect of metal artifacts; however, it underestimated the size of the metal rods. The monoenergetic and dual energy composition techniques of Siemens scanner could not effectively reduce metal artifacts.

将金属植入物放在丙烯酸模型中，以便对来自三个制造商的计算机断层扫描（CT）扫描仪中使用的金属伪影减少技术进行定量分析。将两根钛棒放在由丙烯酸制成的圆柱体模型中的凹槽中，然后在凹槽中充满水。在腹部CT设置下，使用三台CT扫描仪（东芝，GE，西门子）扫描了人体模型。使用ImageJ测量CT数的准确性，对比度和噪声比，图像中金属棒的面积以及受影响的水像素面积的比例。在三个厂商中比较了不同的迭代重建，双重能量和金属伪影减少技术。三台扫描仪的最高对比度噪声比为85.7±8.4（Toshiba），85.9±11.7（GE）和55.0±14.8（Siemens）；²（东芝），155.0±1.0（GE）和170.6±5.3（西门子）。使用Toshiba扫描仪的单能金属伪影减少获得的受影响像素面积分数为2.2％±0.7％，比使用GE扫描仪的金属伪影减少软件获得的4.1％±0.7％更有利（p = 0.002）。在所有定量结果中，用受影响的像素区域的分数进行的估计与实际图像中金属伪影减少的效果相匹配。因此，东芝扫描仪的单能金属伪影减少技术具有令人满意的效果。GE扫描仪的金属伪影减少软件有效地减少了金属伪影的影响；但是，它低估了金属棒的尺寸。西门子扫描仪的单能和双能合成技术无法有效减少金属伪影。