分段读出DWI在显示乳腺癌病灶中的优势  

The value of readout-segmented echo-planar imaging diffusion-weighted imaging in breast cancer

作　　者：邓和平[1] 陈晓煜 任静[1] 刘磊 后军民[1] 龚辉 王丹[1] 王闽[1] DENG He-ping;CHENG Xiao-yi;REN Jing(Department of Imaging Diagnosis,Sichuan Cancer Hospital,Sichuan 610000,China)

机构地区：[1]四川省肿瘤医院研究所影像诊断部

出　　处：《放射学实践》2019年第8期892-895,共4页Radiologic Practice

摘　　要：目的:探讨分段读出平面回波扩散加权成像(RS-EPI-DWI)相对于单次激发(SS)EPI-DWI在乳腺癌检查中的价值。方法:回顾性分析47例经病理证实的乳腺癌患者的治疗前DWI资料,全部病例使用Siemens Skyra3.0T磁共振扫描仪,分别采用SS-EPI-DWI及RS-EPI-DWI序列进行扫描,在b值为800s/mm^2的DWI图像上测量乳腺肿瘤和正常区域的信号值及噪声值,计算肿瘤区域的信噪比(SNR)、对比噪声比(CNR),在表观扩散系数(ADC)图上测量乳腺肿瘤的ADC值,比较两组间ADC值的差异,比较两组在淋巴结显示程度上的差异。结果:乳腺肿瘤在RS-EPI-DWI图像上的SNR及CNR值较SS-EPI-DWI图像上高,差异均有统计学意义(t=29.88,P<0.01;t=31.65,P<0.01);两个序列的ADC图上乳腺肿瘤的ADC测量值的差异无统计学意义(t=-1.568,P=0.124>0.05);RS-EPI-DWI较SS-EPI-DWI图像在腋窝小淋巴结的显示上更具优势。结论:分段读出DWI较传统DWI的图像质量更佳,对于腋窝小淋巴结的显示更具优势,其临床应用价值相对更高。Objective:To explore the value of readout-segmented echo-planar imaging diffusion-weighted imaging(RS-EPI-DWI)in breast cancer compared with single-shot(SS)-EPI-DWI.Methods:The DWI data of 47 patients with breast carcinoma confirmed by pathology before treatment were analyzed retrospectively.All cases underwent DWI examination using both SS-EPI and RS-EPI sequences at a Siemens Skyra 3.0T MR scanner.The signal values of tumor,normal breast tissue and noise on the DWI images with a b value of 800 were measured respectively.The signal to noise ratio(SNR)and contrast noise ratio(CNR)of tumor regions were calculated.The apparent diffusion coefficient(ADC)values of tumors were measured on the ADC map,and the difference of the ADC value between the two groups was compared.The two groups were graded on the axillary lymph node display.Results:The SNRs and CNRs of breast carcinomas on RS-EPI-DWI were higher than those on SS-EPI-DWI(t=29.88,P<0.01;t=31.65,P<0.01).There was no statistical difference in the ADC values of breast tumors between SS-EPI-DWI and RS-EPI-DWI(t=-1.568,P=0.124>0.05).RS-EPI-DWI had more advantages than SS-EPI-DWI in display of small lymph nodes in the axilla.Conclusion:RS-EPI-DWI has better image quality than SS-EPI-DWI with more advantages in displaying small axillary lymph nodes,thus might be more valuable in clinical application.

关 键 词：乳腺癌 扩散加权成像 分段读出序列 平面回波成像 单次激发 

分 类 号：R445.2[医药卫生—影像医学与核医学] R739.37[医药卫生—诊断学]