双源CT三期双能量扫描双期脑血管减影成像的初步应用  

Initial Application of Double Phase Cerebral Subtraction Angiography with Dual-source CT in Three Phases Dual-energy Scan Mode

作　　者：毛俊[1] 王建明[1] 陈海东[1] 肖万宏[1] 王艳萍[1] 陈敏[1] 杜中立[1] 何虹[1] 罗云辉[1] 

机构地区：[1]暨南大学附属珠海医院(珠海市人民医院)放射科,广东珠海519000

出　　处：《中国CT和MRI杂志》2014年第5期13-16,共4页Chinese Journal of CT and MRI

摘　　要：目的通过自身对比双能量减影与数字减影图像质量,探讨第二代双源CT三期双能量扫描模式双期脑血管减影成像的临床初步应用。方法 20例三期双能量双源CT脑血管检查按减影法分成A组:双能量减影;B组:100kv Neuro DSA数字减影。计算2组图像信噪比(SNR)与对比噪声比(CNR)及减影时间,按去骨程度及血管显示与切割程度,采取双盲法分别对图像评分(1-5分)。比较2组间统计学差异。结果减影时间A组短于B组(2.07±0.19min VS2.27±0.13min,P<0.05)。A组动、静脉期SNR(29.89±12.20,30.49±7.34)均高于B组(24.42±9.99,27.17±6.59),差异有统计学意义(P<0.05)。2组动、静脉期CNR差异均不显著(P>0.05)。2组动、静脉期图像去骨评分差异均不显著(P>0.05),A组动脉期血管评分低于B组(3.95±0.97 vs 4.95±0.23,P<0.05),主要为部分颈内动脉管腔局部缺损。2组静脉期评分差异不显著。三期双能量扫描DLP平均为416.21±26.10 mGy·cm,较双期双能量扫描增加约10%。结论双源CT三期双能量扫描模式的双期脑血管成像,增加少许辐射剂量,可同时利用双能量与数字减影的优点来相互弥补诊断,推荐临床急诊脑血管检查。Objective To assess the initial clinic application of double phase subtraction angiography with second generation dual-source CT in 3 phases dual-energy scan mode, Self-contrast method was used to compared dual-energy subtraction with 100kv Neuro DSA subtraction. Methods 20 patients underwent 3 phases dual-energy scan mode CT angiography were divided into group A （with dual-energy subtraction） and group B（with 100KV Neuro DSA subtraction）.The signal-to-noise ratio（SNR） and contrast-to- noise ratio（CNR） of double phrase subtraction images were measured,and the average postprocessing time of subtraction was calculated in two groups,respectively.The double phase subtraction images quality were graded by 2 independent readers on a 5-point scale （5=excellent） in double-blind, according to various degrees of the residual bones,as well as the vessel displayed and luminal integrity,respectively.Differences between two groups were analyzed.Results The average postprocessing time of subtraction in group A was shorter than in group B（2.07 ± 0.19min vs2.27 ± 0.13min,P 〈 0.05）.The image SNR of Arterial and Venous phase in group A（29.89 ± 12.20,30.49 ± 7.34） were higher than in group B（24.42 ± 9.99, 27.17 ± 6.59）,P 〈0.05,respectively.The double phrase image CNR showed no difference between 2 groups （P 〉 0.05）. There were no singnificant difference in the bone removal image scores of double phase between 2 groups respectively （P 〉 0.05）.The vessel image scores of Arterial phase were lower in group A than in group B（3.95 ± 0.97 vs 4.95 ± 0.23,P〈0.05）.Some Internal carotid has not good luminal integrity in group A. The vessel image scores of Venous phase showed no difference between 2 groups （P 〉 0.05）. The mean dose length product （DLP） of 3 phases scan mode was 416.21± 26.10 mGy · cm,an increase of 10% over the double phase scan mode. Conclusion With a slight increase radiation dose,double phase subtraction angiography with second generation dual-source C

关 键 词：脑血管造影术 双能量减影 

分 类 号：R445.3[医药卫生—影像医学与核医学] R743[医药卫生—诊断学]