膝关节置换术后CT静脉成像：320排CT扫描仪上基于双能CT的单色成像与单能金属伪影减少技术的比较
CT venography after knee replacement surgery: comparison of dual-energy CT-based monochromatic imaging and single-energy metal artifact reduction techniques on a 320-row CT scanner.
作者信息
Kidoh Masafumi, Utsunomiya Daisuke, Oda Seitaro, Nakaura Takeshi, Funama Yoshinori, Yuki Hideaki, Hirata Kenichiro, Hatemura Masahiro, Namimoto Tomohiro, Yamashita Yasuyuki
机构信息
Department of Diagnostic Radiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan.
Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan.
出版信息
Acta Radiol Open. 2017 Feb 1;6(2):2058460117693463. doi: 10.1177/2058460117693463. eCollection 2017 Feb.
BACKGROUND
An optimal metal artifact reduction (MAR) technique is needed for a reliable and accurate image-based diagnosis.
PURPOSE
Using a 320-row scanner, we compared the dual-energy computed tomography (CT)-based monochromatic and the single-energy metal artifact reduction (SEMAR) techniques for CT venography (CTV) to identify the better imaging method for diagnosing deep vein thrombosis (DVT) in patients who had undergone knee replacement surgery.
MATERIAL AND METHODS
Twenty-three consecutive patients with suspected DVT after unilateral knee replacement surgery underwent dual-energy CT (135/80 kVp). Monochromatic images of 35-135 keV were generated; the monochromatic image with the best signal-to-noise ratio (SNR) of the popliteal vein near the metal prosthesis were selected. The projection data of 80 kVp were reconstructed using MAR algorithm. The mean SNR ON MAR and the best SNR ON monochromatic images were compared. Two radiologists evaluated visualization of the metal artifacts on a four-point scale where 1 = extensive artifacts, 2 = strong artifacts, 3 = mild artifacts, and 4 = minimal artifacts.
RESULTS
The mean SNR was significantly higher on the MAR than the monochromatic images (12.8 ± 4.7 versus 7.7 ± 5.1, < 0.01) and the visual scores were significantly higher for MAR than monochromatic images (2.6 ± 0.8 versus 1.3 ± 0.4, < 0.01).
CONCLUSION
For CTV after knee replacement surgery, the MAR technique is superior to the monochromatic imaging technique.
背景
为了进行可靠且准确的基于图像的诊断，需要一种最佳的金属伪影减少（MAR）技术。
目的
使用320排扫描仪，我们比较了基于双能计算机断层扫描（CT）的单色成像和单能金属伪影减少（SEMAR）技术在CT静脉造影（CTV）中的应用，以确定在接受膝关节置换手术的患者中诊断深静脉血栓形成（DVT）的更佳成像方法。
材料与方法
23例单侧膝关节置换术后怀疑有DVT的连续患者接受了双能CT（135/80 kVp）检查。生成了35 - 135 keV的单色图像；选择金属假体附近腘静脉信噪比（SNR）最佳的单色图像。使用MAR算法重建80 kVp的投影数据。比较了MAR上的平均SNR和单色图像上的最佳SNR。两名放射科医生以四点量表评估金属伪影的可视化情况，其中1 =广泛伪影，2 =强烈伪影，3 =轻度伪影，4 =最小伪影。
结果
MAR上的平均SNR显著高于单色图像（12.8±4.7对7.7±5.1，<0.01），MAR的视觉评分显著高于单色图像（2.6±0.8对1.3±0.4，<0.01）。
结论
对于膝关节置换术后的CTV，MAR技术优于单色成像技术。
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