Metal artefact reduction with cone beam CT: an in vitro study
Metal artefact reduction with cone beam CT: an in vitro study
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DOI：
10.1259/dmfr/80899839
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发表时间：
2012-03-01
影响因子：
3.3
通讯作者：
Noujeim, M.
中科院分区：
文献类型：
--
作者：
Bechara, B. B.;Moore, W. S.;Noujeim, M.
背景：患者口腔中的金属已被证明会引起伪影，干扰锥形束CT的诊断质量。最近，一家制造商已经提出了一种算法和软件，可以减少金属条纹伪影（Picasso Master 3D（R）机器; Vatech，Hwaseong，Republic of Korea）。目的：本研究的目的是确定金属伪影减少算法是否有效并提高对比度噪声比。方法：构建了一个体模，其中包含三个金属珠和三个环氧树脂基骨替代物，以模拟金属旁边的骨。将体模放置在视野中心和外围。在50-90 kVp下采集了10个数据集。使用公共领域软件ImageJ（NIH Image，Bethesda，MD）分析获得的图像。轮廓线用于评价灰度级变化，面积直方图用于评价对比度。计算对比噪声比。结果：金属伪影减少选项减少了灰度值变化，增加了对比噪声比。当体模处于体积中间并且激活金属伪影减少时，灰度值变化最小。结论：当使用金属伪影去除算法时，可以获得更好的体模图像。Dentomaxillofacial Radiology（2012）41，248-253. doi：10.1259/dmfr/80899839
Background: Metal in a patient's mouth has been shown to cause artefacts that can interfere with the diagnostic quality of cone beam CT. Recently, a manufacturer has made an algorithm and software available which reduces metal streak artefact (Picasso Master 3D (R) machine; Vatech, Hwaseong, Republic of Korea).Objectives: The purpose of this investigation was to determine whether or not the metal artefact reduction algorithm was effective and enhanced the contrast-to-noise ratio.Methods: A phantom was constructed incorporating three metallic beads and three epoxy resin-based bone substitutes to simulate bone next to metal. The phantom was placed in the centre of the field of view and at the periphery. 10 data sets were acquired at 50-90 kVp. The images obtained were analysed using a public domain software ImageJ (NIH Image, Bethesda, MD). Profile lines were used to evaluate grey level changes and area histograms were used to evaluate contrast. The contrast-to-noise ratio was calculated.Results: The metal artefact reduction option reduced grey value variation and increased the contrast-to-noise ratio. The grey value varied least when the phantom was in the middle of the volume and the metal artefact reduction was activated. The image quality improved as the peak kilovoltage increased.Conclusion: Better images of a phantom were obtained when the metal artefact reduction algorithm was used. Dentomaxillofacial Radiology (2012) 41, 248-253. doi: 10.1259/dmfr/80899839