眼动脉CTA单能量图像keV值的优化及与混合能量图像的比较  

Compare optimize ophthalmic artery CT angiography single image keV energy value and the mixing energy image

作　　者：赵冬青[1] 马怿民 王志忠[1] 付建军[1] 梁万琴[1] 杜凡[1] 

机构地区：[1]解放军第474医院医学影像科,乌鲁木齐830011

出　　处：《放射学实践》2015年第5期596-598,共3页Radiologic Practice

摘　　要：目的:计算眼动脉CT血管成像(CTA)最佳单能量图像的keV值,并将最佳单能量图像与混合能量图像进行比较。方法:35例患者行眼动脉CTA检查,同时得到混合能量图像及单能量图像,运用GSI软件获得最佳keV的单能量图像。测量眼动脉起始部、内直肌肌腹、肌锥内脂肪及颞叶脑白质的CT值及标准差,计算血管对比噪声比、眼动脉对比强化比值、眼动脉标准差(噪声),并与混合能量图像进行比较;对最佳keV单能量图像及混合能量图像的眼动脉及分支显示情况进行主观评分。结果:眼动脉CTA单能量图像的最佳keV值为(62.70±3.37)。最佳单能量图像的对比噪声比、噪声、眼动脉对比强化比值均高于混合能量图像,两者差异有统计学意义(P<0.05)。最佳单能量图像显示眼动脉及分支血管的主观评分高于混合能量图像,差异有统计学意义(P<0.05)。结论:眼动脉CTA单能量图像的最佳keV值约为63keV,最佳keV单能量图像能够更好地显示眼动脉及分支血管。Objective：To investigate the ophthalmic artery CT angiography images keV best single energy value,and the best single energy image and hybrid energy image comparison. Methods=The ophthalmic artery CT angiography scan spectra 35 cases,but to give a mixed picture of energy and single-energy image,using GSI software Optimal CNR tool to get the best single keV energy image. First measure the beginning part of the ophthalmic artery, internal straight abdominal muscle,fat and muscle cone temporal lobe white matter CT value and standard deviation, calculated vascular contrast to noise ratio, the ophthalmic artery contrast enhancement ratio, standard deviation and the ophthalmic artery mixing energy image comparison, paired t test. Secondly eye artery and its branches display cases subjective ratings. Results： （62.7 ±3.37） is the best Value of the ophthalmic artery CTA keV single energy images. Best single energy image contrast to noise ratio, standard deviation, ophthalmic artery contrast enhancement ratio and mixed-energy image and the difference was statistically significant （P〈0. 05） ,the best single energy image contrast to noise ratio,standard deviation, ophthalmic artery contrast enhancement ratio were higher than the hybrid energy images. Both subjective ratings also statistically significant （P〈 0.05） ,the best single energy image shows the ophthalmic artery and branch vessels better than the hybrid energy images. Conclusion：Choose the appropriate value of single keV energy image to better display the ophthalmic artery and branch vessel,about the time 63keV,can get the best of the ophthalmic artery images.

关 键 词：眼动脉 单能量 混合能量 体层摄影术 X线计算机 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] R770.4[自动化与计算机技术—计算机科学与技术]