[1]董晓军,聂婷,陈宗桂,等.MSCT轴向分辨力和图像噪声影响因素分析[J].中国医学物理学杂志,2020,37(5):604-607.[doi:10.3969/j.issn.1005-202X.2020.05.014]
　DONG Xiaojun,NIE Ting,CHEN Zonggui,et al.Analysis of factors affecting MSCT axial resolution and image noise[J].Chinese Journal of Medical Physics,2020,37(5):604-607.[doi:10.3969/j.issn.1005-202X.2020.05.014]
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MSCT轴向分辨力和图像噪声影响因素分析()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
37
期数:
2020年第5期
页码:
604-607
栏目:
医学影像物理
出版日期:
2020-05-25

文章信息/Info

Title:
Analysis of factors affecting MSCT axial resolution and image noise
文章编号:
1005-202X（2020）05-0604-04
作者:
董晓军1; 聂婷1; 陈宗桂1; 易文中2
1. 湖南医药学院，湖南怀化418000；2. 怀化市第一人民医院影像中心，湖南怀化418000
Author(s):
DONG Xiaojun1;  NIE Ting1;  CHEN Zonggui1;  YI Wenzhong2
1.Hunan University of Medicine, Huaihua 418000, China 2. Imaging Center, the First People′s Hospital of Huaihua City, Huaihua 418000, China
关键词:
多排螺旋CT; 轴向分辨力; 断层灵敏度曲线; 图像噪声; 影响因素
Keywords:
multi-slice spiral CT axial resolution section sensitivity profile image noise influence factor
分类号:
R318；R811.1
DOI:
10.3969/j.issn.1005-202X.2020.05.014
文献标志码:
A
摘要:
目的：探讨多排螺旋CT（MSCT）轴向分辨力或断层灵敏度曲线（SSP）和图像噪声的影响因素。方法：使用临床常 用的腹部扫描模式，采用不同直径的模板，重建层厚、螺距、电压（kV）、重建算法等扫面参数，进行MSCT扫描，对不同参数 对断层图像SSP和图像噪声的影响进行统计学分析。结果：当螺距和准直器宽度保持不变，不同层厚和重建算法得到的 SSP的半高宽FWHM值基本保持不变（P>0.05）；当重建算法和准直器宽度保持不变，不同螺距和层厚得到的SSP的半高 宽FWHM值基本保持不变（P>0.05）；不同准直器宽度，同螺距和层厚得到的SSP 的半高宽FWHM值基本保持不变（P> 0.05）；随着层厚、mAs增加，图像噪声减小（P<0.05）；随着kV增加，图像噪声随之减小，不同重建算法下图像噪声存在明显 差异（P<0.05）。结论：卷积重建算法、螺距和准直器宽度对SSP的影响很小，螺距对图像噪声影响很小，而层厚、重建算 法、mAs、kV对图像噪声影响大。层厚、mAs、kV增大，图像噪声减小；重建算法分辨率越高，图像噪声越大。
Abstract:
Objective To explore the factors affecting multi-slice spiral CT (MSCT) axial resolution or section sensitivity profile (SSP) and image noise. Methods With the commonly-used abdominal scan mode, the templates of different diameters and different parameters, such as reconstruction layer thickness, pitch, voltage and reconstruction algorithm, were adopted for MSCT scanning, thereby statistically analyzing the effects of different parameters on SSP of cross-sectional images and image noise. Results When pitch and collimator width remained unchanged, the full-width at half-maximum (FWHM) of SSP obtained by different layer thicknesses and reconstruction algorithms remain basically the same (P>0.05). When reconstruction algorithm and collimator width remain unchanged, the FWHM of SSP obtained by different pitches and layer thicknesses also remain basically the same (P>0.05). With different collimator widths, the same pitch and the same layer thickness, the FWHM of SSP remained basically the same (P>0.05). As the layer thickness and mAs increased, the image noise decreased (P<0.05). With the increase of kV, image noise was decreased. There were significant differences in image noise when different reconstruction algorithms were adopted (P<0.05). Conclusion Convolution reconstruction algorithm, pitch and collimator width have little effect on SSP, and pitch has trivial effect on image noise, while layer thickness, reconstruction algorithm, mAs and kV have significant effects on image noise.With the increases of layer thickness, mAs and kV, the image noise is decreased. The higher the resolution of the reconstruction algorithm is, the larger the image noise is.

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备注/Memo

备注/Memo:
【收稿日期】2019-12-23 【基金项目】湖南省教育厅科学研究项目（16C1150） 【作者简介】董晓军，主治医师，研究方向：腹部影像学诊断及医学影像 教学，E-mail: lvmaikou0314@163.com 【通信作者】易文中，教授，研究方向：腹部MRI 诊断，E-mail: chenke16- 0302@163.com
更新日期/Last Update: 2020-06-03