双源CT双能量扫描对肝外胆管癌检查的评价  

Evaluation of the Extrahepatic Cholangiocarcinomaby Dual-source CT with Dual-energy Scan

作　　者：凃备武[1] 薛建平[1] 余坚东 王磊[1] 蔡静[1] 

机构地区：[1]上海交通大学医学院附属新华医院放射科

出　　处：《中国医学计算机成像杂志》2016年第6期511-515,共5页Chinese Computed Medical Imaging

基　　金：上海市卫生局面上项目No.20124168~~

摘　　要：目的:探讨双源CT双能量扫描对肝外胆管癌显示的价值。方法:15例胆管癌。平扫和门脉期做双能量扫描,得80k Vp、140k Vp和加权120k Vp三组图像。动脉期常规扫描。测量比较病灶与正常肝实质密度差、腹壁脂肪密度标准差(图像噪声)、信噪比(SNR)、对比度噪声比(CNR)及容积剂量指数和有效剂量。结果:平扫三组病灶与正常肝实质密度差平均为12、11.9和13.7 HU,P>0.05。增强后平均为10.4、32.7和14.6 HU,P<0.05。平扫图像噪声平均为14.1、18.3和13.6。SNR,7.2、6.5、7.4。CNR,1.1、0.8和1.3。增强后图像噪声平均为13.8、18.3和11.6。SNR,7.6、6.4、8.9。CNR,1.1、2.4和2.2。P>0.05。三组容积剂量指数和有效剂量分别为11、11.1、16.8和4.3、4.4、7.2,P<0.05。结论:80k Vp图像对肝外胆管癌显示最好,图像质量下降不明显,辐射剂量明显减少。Purpose： To evaluated the value of dual source CT with dual energy scan （DSDECT） in detection of the cholangiocarcinoma. Methods： Fifteen cases of cholangiocarcinoma were collected. They were all scanned with DSDECT. Dual-energy mode was used for the plain scan and portal venous phase scan. Three image sets were obtained, including a pure 80 kVp set, a pure 140 kVp set, and a 120 kVp set which was reconstructed as a weighted average of the 140 and 80 kVp acquisitions. The arterial phase was scanned in conventional mode. The attenuation difference between the tumor and normal hepatic parenchyma, the standard deviation （SD, Noise） of fat in the abdominal wall, the signal-to-noise ratio （SNR）, the contrast-to-noise ratio （CNR）, the CT dose index volume （CTDI） and effective dose （ED） were measured and compared. Results： In plain scan images, the attenuation differences of 140 kVp, 80 kVp, and 120 kVp were 12, 11.9, 13.7 HU in average, P〉0.05. In portal venous phase images, the attenuation difference of three groups were 10.4, 32.7, 14.6 HU in average, P〈0.05. In plain scan image, the SD of the three groups was 13.8, 18.3 and 11.6 in average, the SNR were 7.2, 6.5 and 7.4, and the CNR were 1.1, 0.8 and 1,3. In portal venous phase images, the SD were 14.3, 18.3 and 13.6 in average, the SNR were 7.6, 6.4 and 8.9, the CNR were 1.1, 2.4 and 2.2, P〉0.05. CTDI of three groups were 11, 11.1 and 16.8, and ED were 4.3, 4.4 and 7.2, P〈0.05. Conclusion： The images of 80 kVp were the best for the detection of the cholangiocarcinoma. The quality of image was not declined and the radiation was reduced significantly.

关 键 词：双源 双能量 体层摄影术 X线计算机 胆管癌 

分 类 号：R735.8[医药卫生—肿瘤] R730.44[医药卫生—临床医学]