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首页> 外文期刊>Acta Radiologica >Virtual non-contrast dual-energy CT compared to single-energy CT of the urinary tract: A prospective study
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Virtual non-contrast dual-energy CT compared to single-energy CT of the urinary tract: A prospective study

机译：虚拟非对比双能量CT与尿路单能量CT的前瞻性研究

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Background: Dual-energy computed tomography (DECT) has been shown to be useful for subtracting bone or calcium in CT angiography and gives an opportunity to produce a virtual non-contrast-enhanced (VNC) image from a series where contrast agents have been given intravenously. High noise levels and low resolution have previously limited the diagnostic value of the VNC images created with the first generation of DECT. With the recent introduction of a second generation of DECT, there is a possibility of obtaining VNC images with better image quality at hopefully lower radiation dose compared to the previous generation. Purpose: To compare the image quality of the single-energy series to a VNC series obtained with a two generations of DECT scanners. CT of the urinary tract was used as a model. Material and Methods: Thirty patients referred for evaluation of hematuria were examined with an older system (Somatom Definition) and another 30 patients with a new generation (Somatom Definition Flash). One single-energy series was obtained before and one dual-energy series after administration of intravenous contrast media. We created a VNC series from the contrast-enhanced images. Images were assessed concerning image quality with a visual grading scale evaluation of the VNC series with the single-energy series as gold standard. Results: The image quality of the VNC images was rated inferior to the single-energy variant for both scanners, OR 11.5-67.3 for the Definition and OR 2.1-2.8 for the Definition Flash. Visual noise and overall quality were regarded as better with Flash than Definition. Conclusion: Image quality of VNC images obtained with the new generation of DECT is still slightly inferior compared to native images. However, the difference is smaller with the new compared to the older system.
机译：背景：双能计算机断层扫描（DECT）已被证明可用于CT血管造影术中减去骨骼或钙，并提供了机会从已给予造影剂的系列中产生虚拟的非增强（VNC）图像静脉注射。高噪声水平和低分辨率以前限制了使用第一代DECT创建的VNC图像的诊断价值。随着第二代DECT的最新推出，与上一代相比，有可能以更低的辐射剂量获得具有更好图像质量的VNC图像。目的：将单能量系列的图像质量与使用两代DECT扫描仪获得的VNC系列进行比较。尿路CT被用作模型。材料和方法：30例接受血尿评估的患者使用较旧的系统（Somatom Definition）检查，另外30例采用新一代系统（Somatom Definition Flash）检查。在静脉注射造影剂之前获得了一个单能系列，在给药后获得了一个双能系列。我们从对比度增强的图像创建了VNC系列。通过以单能量系列为金标准的VNC系列的视觉等级评定来评估图像的图像质量。结果：对于两个扫描仪，VNC图像的图像质量均评定为低于单能变量，对于Definition而言，OR 11.5-67.3，对于Definition Flash而言，OR 2.1-2.8。与Flash相比，Flash的视觉噪声和整体质量要好于Definition。结论：与原始图像相比，新一代DECT获得的VNC图像的图像质量仍略逊一筹。但是，与旧系统相比，新系统的差异较小。

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