| 肾脏占位双能量CT实质期单能量图像特点的研究 |
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| 引用本文： | 雷平贵,王霄英,王鹤,刘建新,姜健.肾脏占位双能量CT实质期单能量图像特点的研究[J].CT理论与应用研究,2017,26(1):19-26. |
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| 作者姓名： | 雷平贵 王霄英 王鹤 刘建新 姜健 |
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| 作者单位： | 1. 贵州医科大学附属医院医学影像科, 贵阳 550004; |
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| 摘 要： | 目的:研究肾脏占位实质期不同水平单能量图像质量，寻找显示肾脏实性占位单能量图像的最佳keV。方法:收集在我院医学影像科行泌尿系双能量CT增强检查20例患者的临床资料及影像数据。利用实质期低能量（80kVp）与高能量（Sn 140kVp）图像后处理出40～120keV总共9组单能量图像。采用客观评价及主观评价方法对图像质量进行评估，通过客观评价分别计算出显示肾脏实性占位最高CNR和SNR单能量图像，然后与权重因子为0.5（M=0.5）的线性融合图像进行比较。主观评价由两名有经验的医学影像科医师进行评估。记录设备上提供的辐射剂量参数CTDIvol，并计算SSDE。结果:入选肾脏单能量图像的病例数20例（男性13例，女性7例），CTDIvol均值为（11.54±4.09）mGy，SSDE为（14.86±3.97）mGy。客观评价:单能量图像CNR值最高是在60keV，SNR值最高是在70keV，分别高于线性融合图像（M=0.5），差异均具有显著统计学意义（P<0.05）。主观评价:70keV组单能量图像与线性融合图像（M=0.5）在整体图像质量及病变细节显示差异均无显著统计学意义（P>0.05）。结论:肾脏实性占位实质期单能量图像最高CNR及SNR值分别为60keV及70keV，均高于线性融合图像，然而单能量的整体图像质量及病变细节评估与线性融合图像相类似。
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| 关 键 词： | 肾脏 双能量CT 单能量图像 线性融合图像 图像质量 |
| 收稿时间： | 2016-06-12 |
The Study on Monochromatic Image Feature for Renal Solid Mass with Dual-energy CT in Nephrographic Phase |
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| LEI Ping-gui,WANG Xiao-ying,WANG He,LIU Jian-xin,JIANG Jian.The Study on Monochromatic Image Feature for Renal Solid Mass with Dual-energy CT in Nephrographic Phase[J].Computerized Tomography Theory and Applications,2017,26(1):19-26. |
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| Authors: | LEI Ping-gui WANG Xiao-ying WANG He LIU Jian-xin JIANG Jian |
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| Institution: | 1. Department of Radiology, The Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China;2. Department of Radiology, Peking University First Hospital, Beijing 100034, China |
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| Abstract: | Objective: To evaluate reconstruction parameters of monochromatic image with dual-energy CT in nephrographic phase, and find the optimal monochromatic image for displaying renal solid mass. Methods:Clinical material and imaging data of 20 patients underwent dual-energy CT examination (80 kVp/Sn140 kVp) were analyzed in this study. Various monochromatic image (40 ~ 120 keV) of Dual-energy CT were generated by 80kVp image and Sn140 kVp image. The image quality was evaluated by subjective and objective assessment. The optimal CNR and SNR monochromatic images were calculated by objective assessment for comparison with linear blending image with weighted factor 0.5. Subjective image quality evaluated by using five points grading scale method for blending linear image with weight factor 0.5 and optimal monochromatic image by two experienced radiologists. Results: Twenty patients (male 13, female 7) were enrolled in this study, mean value of CTDIvol was (11.54 ±4.09) mGy, SSDE was (14.86 ±3.97). Objective assessment: the highest CNR and SNR of monochromatic image was 60 keV and 70 keV, respectively. Significant statistical difference was existed comparison with blending linear image with weight factor 0.5, respectively (all P < 0.05). Subjective assessment:There was no significant statistical difference in the whole image quality and detail of renal lesion comparison with blending linear image with weight factor 0.5 (all P > 0.05). Conclusions: Monochromatic images of 60 keV and 70 keV could get highest CNR and SNR for detection of renal solid mass, respectively, which were superior to linear blending images (M = 0.5). However, Monochromatic images of 60 keV and 70 keV were equivalent to display the whole image quality and detail of renal solid mass.. |
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| Keywords: | kidney dual-energy CT monochromatic image linear blending image image quality |
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