This study compares dual-energy computed tomography (DECT) images of a phantom including different material inserts and with additional lateral titanium or stainless steel inserts, simulating bilateral hip prostheses. Dual-source (DS) and fast kV-switching (FKS) DECT with/without metal artefact reduction (MAR) were compared with regards to virtually monoenergetic CT number accuracy and the depiction of different materials. Streak artefacts were observed between the metal inserts that were more severe with steel compared to titanium inserts. The artefact severity and CT number accuracy depended on the photon energy (keV) for both DECT techniques. While MAR generally increased the CT number accuracy and material depiction within the streak artefacts, it sometimes decreased the accuracy outside the streak artefacts for both DS and FKS. FKS depicted the metal inserts more accurately than DS with regards to both CT numbers and external diameter.

中文翻译：

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不同双能 CT 技术的金属制品比较

本研究比较了模型的双能计算机断层扫描 (DECT) 图像，包括不同的材料插入物和额外的横向钛或不锈钢插入物，模拟双侧髋关节假体。比较了双源 (DS) 和快速 kV 切换 (FKS) DECT（带/不带金属伪影减少 (MAR)）的几乎单能 CT 数字精度和不同材料的描述。在金属嵌件之间观察到条纹伪影，与钛嵌件相比，钢嵌件更为严重。伪影严重程度和 CT 数精度取决于两种 DECT 技术的光子能量 (keV)。虽然 MAR 通常提高了条纹伪影内的 CT 数精度和材料描述，但它有时会降低 DS 和 FKS 的条纹伪影之外的精度。