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Abstract：
UNASSIGNED: This study aimed to evaluate three-dimensional (3D) negative-contrast CT cholangiopancreatography (nCTCP) image quality using dual-energy CT (DECT) with iterative reconstruction (IR) technique in patients with pancreatobiliary dilatation compared with single-energy CT (SECT).
UNASSIGNED: Of the patients, 67 and 56 underwent conventional SECT (SECT set) and DECT with IR technique (DECT set), respectively. All patients were retrospectively analyzed during the portal phase to compare objective image quality and other data including patient demographics, hepatic and pancreatic parenchymal enhancement, noise, and attenuation difference (AD) between dilated ducts and enhanced hepatic parenchyma, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and CT volume dose index (CTDIvol). Two radiologists used the five-point Likert scale to evaluate the subjective image quality of 3D nCTCP regarding image noise, sharpness of dilated ducts, and overall image quality. Statistical analyses used the Mann-Whitney U test.
UNASSIGNED: No significant difference in patient demographics in either CT set was showed during objective evaluation (p > 0.05). However, higher hepatic and pancreatic parenchymal enhancement, AD, SNR, and CNR and lower hepatic and pancreatic noise (p < 0.005) as well as CTDIvol (p = 0.005) on DECT than on SECT were observed. Higher mean grades on DECT than on SECT were showed for image noise (4.65 vs 3.92), sharpness of dilated ducts (4.52 vs 3.94), and overall image quality (4.45 vs 3.91; p < 0.001), respectively during subjective evaluation.
UNASSIGNED: A higher overall image quality and lower radiation dose on 3D nCTCP can be obtained by DECT with IR technique than with conventional SECT in patients with pancreatobiliary dilatation.
UNASSIGNED: Of the patients, 67 and 56 underwent conventional SECT (SECT set) and DECT with IR technique (DECT set), respectively. All patients were retrospectively analyzed during the portal phase to compare objective image quality and other data including patient demographics, hepatic and pancreatic parenchymal enhancement, noise, and attenuation difference (AD) between dilated ducts and enhanced hepatic parenchyma, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and CT volume dose index (CTDIvol). Two radiologists used the five-point Likert scale to evaluate the subjective image quality of 3D nCTCP regarding image noise, sharpness of dilated ducts, and overall image quality. Statistical analyses used the Mann-Whitney U test.
UNASSIGNED: No significant difference in patient demographics in either CT set was showed during objective evaluation (p > 0.05). However, higher hepatic and pancreatic parenchymal enhancement, AD, SNR, and CNR and lower hepatic and pancreatic noise (p < 0.005) as well as CTDIvol (p = 0.005) on DECT than on SECT were observed. Higher mean grades on DECT than on SECT were showed for image noise (4.65 vs 3.92), sharpness of dilated ducts (4.52 vs 3.94), and overall image quality (4.45 vs 3.91; p < 0.001), respectively during subjective evaluation.
UNASSIGNED: A higher overall image quality and lower radiation dose on 3D nCTCP can be obtained by DECT with IR technique than with conventional SECT in patients with pancreatobiliary dilatation.
摘要：
■本研究旨在与单能量CT（SECT）相比，使用双能量CT（DECT）和迭代重建（IR）技术评估胰胆管扩张患者的三维（3D）阴性对比CT胰胆管造影（nCTCP）图像质量。
■患者，67和56接受了常规SECT（SECT设置）和带有IR技术的DECT（DECT设置），分别。在门静脉阶段对所有患者进行回顾性分析，以比较客观图像质量和其他数据，包括患者人口统计学，肝和胰腺实质增强，噪音,扩张导管和增强肝实质之间的衰减差异（AD），信噪比(SNR)，对比噪声比(CNR)，和CT体积剂量指数(CTDIvol)。两位放射科医生使用五点李克特尺度来评估3DnCTCP关于图像噪声的主观图像质量，扩张导管的清晰度，和整体图像质量。统计分析使用Mann-WhitneyU检验。
■在客观评估过程中，任一CT组的患者人口统计学均无明显差异（p>0.05）。然而,肝脏和胰腺实质增强，AD,SNR,与SECT相比，DECT上的CNR和较低的肝和胰腺噪声（p<0.005）以及CTDIvol（p=0.005）。图像噪声显示DECT的平均等级高于SECT（4.65vs3.92），扩张导管的锐度（4.52比3.94），和整体图像质量（4.45对3.91；p<0.001），分别在主观评价过程中。
■在胰胆管扩张患者中，使用IR技术的DECT可以获得比常规SECT更高的3DnCTCP总体图像质量和更低的辐射剂量。
■患者，67和56接受了常规SECT（SECT设置）和带有IR技术的DECT（DECT设置），分别。在门静脉阶段对所有患者进行回顾性分析，以比较客观图像质量和其他数据，包括患者人口统计学，肝和胰腺实质增强，噪音,扩张导管和增强肝实质之间的衰减差异（AD），信噪比(SNR)，对比噪声比(CNR)，和CT体积剂量指数(CTDIvol)。两位放射科医生使用五点李克特尺度来评估3DnCTCP关于图像噪声的主观图像质量，扩张导管的清晰度，和整体图像质量。统计分析使用Mann-WhitneyU检验。
■在客观评估过程中，任一CT组的患者人口统计学均无明显差异（p>0.05）。然而,肝脏和胰腺实质增强，AD,SNR,与SECT相比，DECT上的CNR和较低的肝和胰腺噪声（p<0.005）以及CTDIvol（p=0.005）。图像噪声显示DECT的平均等级高于SECT（4.65vs3.92），扩张导管的锐度（4.52比3.94），和整体图像质量（4.45对3.91；p<0.001），分别在主观评价过程中。
■在胰胆管扩张患者中，使用IR技术的DECT可以获得比常规SECT更高的3DnCTCP总体图像质量和更低的辐射剂量。
