| 虚拟单能图像与常规CT图像的图像质量对比 |
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| 引用本文： | 陈琳钰,方姝,陈勇,董海鹏,王兰,常蕊. 虚拟单能图像与常规CT图像的图像质量对比[J]. CT理论与应用研究, 2022, 31(2): 219-226. DOI: 10.15953/j.ctta.2021.041 |
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| 作者姓名： | 陈琳钰 方姝 陈勇 董海鹏 王兰 常蕊 |
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| 作者单位： | 上海交通大学医学院附属瑞金医院放射科, 上海200025 |
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| 摘 要： | 目的:对比双源双能CT的虚拟单能图像与常规CT图像的图像质量.方法:采用西门子SOMATOM Force双源双能CT扫描图像质量控制体模Catphan 500的高对比度分辨率CTP528组件和低对比度分辨率CTP515组件,分别采用双球管扫描方案重建低、中、高3档虚拟单能能谱图像(A组:40keV,B组:70keV,C...
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| 关 键 词： | 双能CT 虚拟单能 体模 |
| 收稿时间： | 2021-11-21 |
Comparison of Image Quality between Virtual Monochromatic Images and Conventional CT Images |
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| CHEN Linyu,FANG Shu,CHEN Yong,DONG Haipeng,WANG Lan,CHANG Rui. Comparison of Image Quality between Virtual Monochromatic Images and Conventional CT Images[J]. Computerized Tomography Theory and Applications, 2022, 31(2): 219-226. DOI: 10.15953/j.ctta.2021.041 |
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| Authors: | CHEN Linyu FANG Shu CHEN Yong DONG Haipeng WANG Lan CHANG Rui |
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| Affiliation: | Department of Radiology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025 |
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| Abstract: | Objective: To compare the image quality between virtual monochromatic images (VMI) of dual-source dual-energy CT (DECT) and conventional CT images. Siemens SOMATOM Force dual source dual energy CT was adopted in the scanning of the high contrast resolution CTP 528 component and low contrast resolution CTP 515 component of image quality control phantom catphan 500. Dual-tube dual-energy scanning scheme was used to reconstruct low, medium and high-level VMI (group A: 40 keV, group B: 70 keV, group C: 100 keV) and a single tube scanning scheme was used to reconstruct conventional images (Group D: 120 kVp). Two radiologiss carried out the measurement of high resolution by the smallest line pair one could distinguish and low-contrast sensitivity was measured by the smallest diameter under 1% contrast. Mean noise, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were also evaluated for each group. Results: The image consistency of the two radiologists turned out well (high reolution and low-contrast sensitivity: Kappa coefficient=0.667; noise parameter: Spearman r = 0.920). Among all images, D group performed the best in high resolution (6 lp/cm) and A and B groups showed the best low-contrast sensitivity (diameter of 4 mm). C group had the lowest noise (2.333±0.289) and highest SNR (37.944±3.949). Mean noise and SNR were found significantly difference among the four groups. B group showed the highest CNR (3.361±0.875), but no statistical significance was found among the groups. Conclusion: Compared with conventional CT, VMI images from DECT could improve image quality while retain low-contrast sensitivity; image noise decreases while SNR increases as VMI elevates. |
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