| 锥束CT的CT值标定方法 |
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| 引用本文： | 陈云斌, 王远, 刘清华. 锥束CT的CT值标定方法[J]. CT理论与应用研究, 2015, 24(4): 553-561. DOI: 10.15953/j.1004-4140.2015.24.04.09 |
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| 作者姓名： | 陈云斌 王远 刘清华 |
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| 作者单位： | 1. 中国工程物理研究院应用电子学研究所, 四川 绵阳 621900; |
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| 摘 要： | CT值是医学CT重建图像的一个必备要素,在某些场合下已成为医生诊断疾病的辅助工具,比如骨密度测量、图像分割与识别等。本文介绍一种锥束CT的CT值转换方法。借助Sedentex CT模体,分别获得5种材料的标称CT值和锥束CT衰减系数重建值,并经线性拟合,建立起标称CT值和衰减系数重建值之间的转换方程。最后,分析对比度噪声比和图像灰度值均匀性偏差在CT值转换后的变化情况。
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| 关 键 词： | CT值 衰减系数 对比度噪声比 均匀性偏差 |
| 收稿时间： | 2015-05-26 |
A CT Number Conversion Method of Cone Beam CT |
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| CHEN Yun-bin, WANG Yuan, LIU Qing-hua. A CT Number Conversion Method of Cone Beam CT[J]. CT Theory and Applications, 2015, 24(4): 553-561. DOI: 10.15953/j.1004-4140.2015.24.04.09 |
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| Authors: | CHEN Yun-bin WANG Yuan LIU Qing-hua |
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| Affiliation: | 1. Institute of Applied Electronics, CAEP, Mianyang 621900, China;2. National X-ray Digital Imaging Instrument Centre, Mianyang 621000, China |
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| Abstract: | As a necessary composition of medical CT image, in some cases, CT number has been an aid when doctors diagnose diseases, such as measurement of bone density, image segmentation and recognition. This paper described a CT number conversion method of cone beam CT. On the base of Sedentex CT phantom, standard CT numbers and reconstructed attenuation coefficients of five analyzed materials were obtained respectively. The conversion equation between CT number and reconstructed attenuation coefficient was established by linear fitting. After CT number transformation, the numerical changes of contrast to noise ratio and uniform deviation were analyzed in the end. |
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| Keywords: | CT number attenuation coefficient contrast to noise ratio uniform deviation |
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