相对表观弥散系数与钆喷替酸葡甲胺增强MRI诊断兔头颈转移淋巴结的对比研究
Chinese Imaging Journal of Integrated Traditional and Western Medicine(2012)
Abstract
目的:比较相对表观弥散系数( rADC)和钆喷替酸葡甲胺(Gd-DTPA)增强MRI诊断兔头颈部转移淋巴结的准确性.方法:24只新西兰大白兔,随机分成2组,每组12只,分别建立炎性淋巴结模型、VX2肿瘤淋巴结转移模型.Gd-DTPA增强前行T1WI、T2WI、磁共振弥散加权成像(DWI)序列扫描,注射Gd-DTPA 80 s后行T1WI序列扫描.测量淋巴结、同层肌肉的ADC值,计算淋巴结/肌肉的rADC值,测量增强前、后T1 WI序列淋巴结、同层肌肉的信号强度(SI)值,计算增强前后信号强度比值(SIr),并进行统计学分析.结果:经病理证实,炎症组取出淋巴结26枚,肿瘤组取出转移淋巴结14枚.炎症组、肿瘤转移组淋巴结的rADC值、SIr值差异均具有统计学意义(t值分别为-8.30,4.76,P均<0.05);利用rADC值鉴别良、恶性淋巴结ROC曲线下面积(AUC)是0.93,阈值0.88,灵敏度为92.3%,特异度为92.9%;SIr值的AUC是0.81,阈值是1.66,灵敏度为78.6%,特异度为88.5%.结论:炎症组、肿瘤转移组淋巴结的rADC值、SIr值差异具有统计学意义;rADC值比钆剂增强扫描SIr值鉴别转移性淋巴结具有较高的准确性.
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