直肠癌3．0T磁共振弥散加权成像及其与病理的相关性研究

目的 探讨3.0T 磁共振背景抑制弥散加权成像（diffusion-weighted imaging withbackground suppression,DWIBS）对直肠癌的诊断价值,并分析其肿瘤表观弥散系数（apparent diffusioncoefficient,ADC）值与病理的相关关系.方法 收集42 例直肠癌患者术前盆腔常规MRI 及DWI 的扫描资料,所有患者均接受直肠癌切除并病理组织学检查.测量肿瘤及正常直肠肠壁的ADC 值并进行统计学分析.结果 （1）直肠癌组与对照组的ADC 值分别为（0.76 ± 0.11） × 10-3mm2/s 和（1.22± 0.16） × 10-3 mm2/s,两组比较差异有统计学意义（P 〈 0.001）.鉴别直肠癌与正常直肠肠壁的ADC值的最佳分界值为0.96 × 10-3 mm2/s,敏感性为95.2%,特异性为97.6%.（2）1 例高分化,33 例中分化及5 例低分化直肠腺癌的ADC 值分别为0.78 × 10-3 mm2/s,（0.75 ± 0.12） × 10-3 mm2/s 及（0.77 ± 0.11）×10-3 mm2/s.中分化与低分化直肠腺癌的ADC 值比较差异无统计学意义（P 〉 0.05）.结论 3.0T 磁共振DWI 能提高直肠癌的检出率,直肠癌原发灶的ADC 值明显低于正常直肠肠壁的ADC 值,不同分化程度的直肠腺癌的ADC 值间无统计学差异.

3.0T MR diffusion-weighted imaging in rectal cancer diagnosing and researching with pathology

Objective To evaluate the efficacy of diffusion-weighted imaging with background suppression(DWIBS) at 3.0T magnetic resonance(MR) for diagnosing rectal cancer,and analyze the relationship between apparent diffusion coefficient(ADC) values and pathological results of tumor.Methods The study included 42 patients with rectal cancer who underwent preoperative routine MRI + DWI examination and were treated by rectal cancer dissection,and then obtained pathological results.ADC values of tumors and normal rectal ...