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3.0T功能MRI动态增强扫描与弥散加强成像在宫颈癌诊断价值的比较研究 ???

2019-07-06崔嵩郭玉珍刘玲玲江新青

新医学 2019年8期

崔嵩 郭玉珍 刘玲玲 江新青

【摘要】 目的 探讨3.0T功能MRI动态增强扫描(DCE)与弥散加权成像(DWI)在宫颈癌诊断中的价值。方法 收集因有可疑宫颈恶性病变或盆腔非宫颈病变需要进行盆腔MRI的81例患者,其中宫颈癌29例、子宫肌瘤25例、正常子宫27例,所有患者均行盆腔MRI (常规扫描、DCE及DWI),获取容量转换常数(Ktrans)、速率常数(Kep)及血管外細胞外间隙容积(Ve)、时间-浓度曲线下初始面积(iAUC)及表观扩散系数(ADC),进行受试者工作特征(ROC)曲线分析,比较DCE与DWI的分析结果。结果 与子宫肌瘤及正常子宫相比,宫颈癌具有更高的Ktrans、Kep、Ve、iAUC值及更低的ADC值(P均< 0.05)。DCE-MRI不同参数诊断宫颈癌的ROC曲线下面积(AUC)分别为:Ktrans值0.836、Kep值0.742、Ve值0.663、iAUC值0.698,其中Ktrans值的ROC AUC最大。DWI的ADC值诊断宫颈癌的ROC AUC为0.970。ADC值诊断宫颈癌的ROC AUC大于Ktrans值的ROC AUC(P < 0.05)。结论 对于诊断宫颈癌,3.0T功能MRI DWI的ADC值比DCE的各项参数具有更高的诊断效能。

【关键词】宫颈癌;磁共振动态增强;扩散加权成像

【Abstract】Objective To investigate the values of 3.0T functional dynamic contrast-enhanced (DCE)- and diffusion-weighted imaging (DWI)-magnetic resonance imaging (MRI) in the diagnosis of cervical cancer.  Methods Eighty-one patients suspected with malignant cervical lesions or pelvic lesions without cervical lessions were recruited to receive pelvic MRI. Among them, 29 patients were diagnosed with cervical cancer, 25 cases of uterine leiomyoma and 27 cases of normal uterus. All patients were subject to routine, DCE- and DWI-MRI of the pelvis. Various parameters including Ktrans, Kep, Ve, iAUC and ADC were obtained. The ROC curve analysis was conducted to compare the analysis results between DWI- and DCE-MRI.  Results The Ktrans, Kep, Ve and iAUC parameters in patients with cervical cancer were significantly higher, whereas the ADC value was remarkably lower compared with those in their counterparts with uterine leiomyoma and normal uterus (all P < 0.05). The area under the ROC curve (AUC) of different parameters in the diagnosis of cervical cancer was 0.836 for Ktrans, 0.742 for Kep, 0.663 for Ve and 0.698 for iAUC, respectively. The AUC of ADC value of DWI in the diagnosis of cervical cancer was calculated as 0.970, significantly higher than 0.836 of Ktrans (P < 0.05).  Conclusion In the diagnosis of cervical cancer, the ADC value of 3.0T functional DWI-MRI has higher diagnostic efficiency compared with alternative DCE-MRI parameters.

【Key words】Cervical cancer;Dynamic contrast-enhancement;Diffusion-weighted imaging

宫颈癌是女性常见的恶性肿瘤。据国家肿瘤防控办公室的统计资料显示,2015年宫颈癌的发病率高居女性恶性肿瘤的第2位[1]。宫颈癌的精确诊断对于疾病的治疗及改善患者的预后具有重要作用,但临床常用的B超、CT以及传统MRI在宫颈癌的诊断中常受到限制[2-5]。近年以动态增强扫描(DCE)及磁共振扩散加强成像(DWI)为代表的功能MRI技术迅速发展,有望为宫颈癌的诊断提供重要帮助。DCE是一种可准确评估组织、病灶内部血供的动态变化情况和微血管分布状况的功能MRI技术,可揭示病灶的血流动力学特点,较为准确地评估病灶内血管的生成状态,且可通过观察对比剂在肿瘤体内的动态分布过程,得出肿瘤血管的渗透率及灌注信息[6]。DWI是目前唯一能够检测活体组织内水分子扩散情况的影像学检查手段,可间接反映组织水平的微观结构特点及变化[7]。……

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