| 赵峰,曾勇明,彭刚,等.胸部低剂量CT扫描管电流与噪声分布相关性研究[J].中华放射医学与防护杂志,2012,32(1):100-103.ZHAO Feng,ZENG Yong-ming,PENG Gang,et al.Correlation between the tube current and image noise in low-dose chest CT scean[J].Chin J Radiol Med Prot,2012,32(1):100-103 |
| 胸部低剂量CT扫描管电流与噪声分布相关性研究 |
| Correlation between the tube current and image noise in low-dose chest CT scean |
| 投稿时间：2011-06-18 |
| DOI：10.3760/cma.j.issn.0254-5098.2012.01.030 |
| 中文关键词: 管电流 噪声 辐射剂量 体层摄影 X射线 |
| 英文关键词:Tube current Noise Radiation dose Tomography X-rays |
| 基金项目:重庆市卫生局科研基金(08-2-29) |
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| 中文摘要: |
| 目的 分析胸部低剂量CT图像噪声分布特点,优化低剂量扫描参数。方法 利用图像空间添加噪声软件对中国人仿真胸部体模CT图像进行6种不同噪声指数的模拟,并分析预设噪声指数与模拟图像噪声值的差异。使用该软件对20例志愿者常规扫描图像进行噪声添加,模拟出10、30、50、80、100、120、150、180及240 mA 9组胸部低剂量图像,记录每幅图像模拟噪声值,并对不同剂量组模拟噪声值进行统计学分析。结果 图像噪声添加法计算的模拟噪声值与预设噪声指数差异不大。胸部低剂量扫描时,图像模拟噪声值随着管电流的降低而增加,当管电流在30~50 mA时,噪声降低显著(F=24.09~40.79,P<0.05);80~240 mA时,噪声值降低幅度变缓;80 mA组与120 mA组之间差异不大。结论 图像空间添加噪声软件可应用于胸部低剂量CT图像噪声的评价研究。胸部低剂量CT检查采用管电流80 mA,能够保证图像噪声较小,同时明显降低辐射剂量。 |
| 英文摘要: |
| Objective To analyze the distribution of image noise in low-dose chest CT scan and optimize the relative scanning parameters. Methods The CT images of the Chinese anthropomorphic chest phantom(CDP-1C) were simulated into six groups of low-dose images with different noise indexs by using an image noise addition tool. The difference between the preset noise index and analog noise value was compared. The CT images of 20 volunteers were also simulated into nine groups of low dose scans with the tube currents of 10, 30, 50, 80, 100, 120, 150, 180 and 240 mA. The noise values of images were recorded and analyzed. Results There was no statistical difference between the analog noise value and the noise index. The image noise of low-dose chest scan was increased with the decrease of tube current. The noise was increased quickly when the current was decreased from 50 to 30 mA(F=24.09-40.79,P<0.05), but the noise increased slowly when the current decreased from 240 to 80 mA. There was no statistical difference between the noise of 80 mA group and that of 120 mA(P>0.05). Conclusions The noise addition tool can be used to evaluate the image noise of low-dose chest CT scan. Adoption of 80 mA in chest CT scan would result in low radiation dose without adding image noise. |
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