How Well Does Dual-Energy Computed Tomography With Metal Artifact Reduction Software Improve Image Quality and Quantify Computed Tomography Number and Iodine Concentration?
How Well Does Dual-Energy Computed Tomography With Metal Artifact Reduction Software Improve Image Quality and Quantify Computed Tomography Number and Iodine Concentration?
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采用金属伪影减少软件的双能计算机断层扫描在提高图像质量以及量化计算机断层扫描数量和碘浓度方面效果如何？
DOI：
10.1097/rct.0000000000000735
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发表时间：
2018
影响因子：
1.3
通讯作者：
Teshima Teruki
中科院分区：
文献类型：
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作者：
Ohira Shingo;Kanayama Naoyuki;Wada Kentaro;Karino Tsukasa;Nitta Yuya;Ueda Yoshihiro;Miyazaki Masayoshi;Koizumi Masahiko;Teshima Teruki
目的本研究的目的是评估使用双能计算机断层扫描和金属伪影减少软件 (MARS) 获得的定量测量的准确性。方法通过改变金属棒（Ti 和 Pb）和参考碘材料的数量，在模型上进行双能计算机断层扫描（快速 kV 切换）。对逆重建虚拟单色图像（VMI）（VMI at 70 keV）进行客观和主观图像分析。结果具有 MARS（无 MARS）的 VMI-Ti 和 VMI-Pb（5 根金属棒）的最大伪影指数分别为 17.4（166.7）和 34.6（810.6）； MARS 显着提高了平均主观 5 分评分（P<0.05）。对于 VMI-Ti 和 VMI-Pb（5 根金属棒），5 mg/mL 碘和 2 mm 芯棒的测量亨斯菲尔德单位与理论值之间的最大差异分别为− 42.2% 和− 68.5%，相应的碘浓度差异分别为− 64.7% 和− 73.0%。结论金属伪影减少软件改善了客观和主观图像质量；然而，定量价值被低估了。
ObjectiveThe objective of this study was to assess the accuracy of the quantitative measurements obtained using dual-energy computed tomography with metal artifact reduction software (MARS).MethodsDual-energy computed tomography scans (fast kV-switching) are performed on a phantom, by varying the number of metal rods (Ti and Pb) and reference iodine materials. Objective and subjective image analyses are performed on retroreconstructed virtual monochromatic images (VMIs)(VMI at 70 keV).ResultsThe maximum artifact indices for VMI-Ti and VMI-Pb (5 metal rods) with MARS (without MARS) were 17.4 (166.7) and 34.6 (810.6), respectively; MARS significantly improved the mean subjective 5-point score (P< 0.05). The maximum differences between the measured Hounsfield unit and theoretical values for 5 mg/mL iodine and 2-mm core rods were− 42.2% and− 68.5%, for VMI-Ti and VMI-Pb (5 metal rods), respectively, and the corresponding differences in the iodine concentration were− 64.7% and− 73.0%, respectively.ConclusionsMetal artifact reduction software improved the objective and subjective image quality; however, the quantitative values were underestimated.