摘要
目的研究扩散加权成像(DWI)在鉴别脑脓肿和坏死、囊变脑肿瘤中的诊断价值。资料与方法对17例脑脓肿和23例脑肿瘤(胶质瘤和转移瘤)行常规MR和DWI检查。DWI采用b=1000s/mm2,b=0s/mm2时进行采集,测量感兴趣区(ROI)的表观扩散系数(ADC)值,两个独立样本间行秩和检验,与常规MR比较,计算敏感性、特异性、阳性预测值、阴性预测值。结果大部分脑脓肿在DWI上为高信号,ADC值为(0.33±0.11)×10-3mm/s,除2例外其余脑肿瘤的坏死、囊变部分在DWI上为低信号,ADC值为(2.46±0.49)×10-3mm/s。结论DWI在鉴别脑脓肿和坏死、囊变脑肿瘤方面是十分有意义的,比常规MR有更大的优越性。
Objective To discuss the value of differentiation of brain abscess and necrotic or cystic brain tumors with DWI, Materials and Methods 17 cases with brain abscesses and 23 cases with cystic or necrotic brain gliomas or metastases were performed with conventional MRI and diffuslon-weighted （b = 1000s/mm^2, b = Os/mm^2 ）. Meanwhile the apparent diffusion coefficient （ADC） of ROI was measured. The results were analyzed using two-independent-samples test, and compared with conventional MR and calculated sensitivity, spech＂ieity, PPV and NPV. Results Hypefintensity signal was seen in most brain abscesses, the ADC value was （0.33 ± 0.11） × 10^-3mm/s. All cystic or necrotic brain tumors but two showed hypointensity signal on DWI and high ADC（2.46 ± 0.49） × 10^-3mm/s. Conclusion DWI is useful in distinguishing brain abscessed from cystic or necrotic brain tumors, which is superior to conventional MRI.
出处
《临床放射学杂志》
CSCD
北大核心
2007年第5期445-447,共3页
Journal of Clinical Radiology
关键词
扩散加权成像
脑脓肿
脑肿瘤
Diffusion-weighted imaging Brain abscess Brain neoplasm
