DWI和ADC值测量在肝脏囊性占位性病变鉴别诊断中的应用价值

目的探讨磁共振扩散加权成像（DWI）和表观扩散系数（ADC）值对肝脏囊性占位性病变的鉴别诊断价值。方法对40例肝囊肿、25例肝脓肿及27例囊变或坏死的肝肿瘤行DwI扫描，对比分析其DWI及ADC图表现，测量肝囊肿、肝脓肿、囊变或坏死的肝肿瘤的囊腔的ADC值及肝脓肿、囊变或坏死的肝肿瘤的壁的ADC值，进行统计学分析。结果肝囊肿、肝脓肿及囊变坏死的肝肿瘤的囊腔的ADC值分别为（3．42±0．34）×10-3mm2／s、（0．74±0．4）×10-3mm2／s、（2．27±0．35）×10-3mm2／s，三者之间差异有统计学意义（P〈0．05）；肝脓肿及囊变坏死的肝肿瘤的壁的ADC值分别为（1．78±0．31）×10-3mm2／s、（1．41±0．26）×10-3mm2／s，两者之间差异有统计学意义（P〈0．05）。结论DWI结合ADC值测量可作为鉴别肝囊肿、肝脓肿及囊变或坏死的肝肿瘤的一种有用的诊断方法。

The value of DWI and ADC values in the differential diagnosis of liver cystic lesions

Objective To explore the value of diffusion weighted imaging （DWI） and apparent diffusion coefficient （ADC） in the differential diagnosis of liver cystic lesions. Methods A total of 40 cases of hepatic cyst, 25 cases of liv- er abscess and 27 cases of cystic and/or necrotic tumor of liver were examined by DWI. DWI and ADC picture find- ings in both group patients were comparatively analyzed. ADC values of the cavities in both group patients and of the wall thickness in the liver abscess and cystic and/or necrotic necrotic tumor of liver were measured and statistically analyzed. Results There were significantly statistical different on ADC values（P 〈 0.01 ） in hepatic cyst（3.42±0.34）× 10-3 mm2/s, liver abscess （0.74±0.4）× 10-3 mm2/s and cystic and/or necrotic tumor of liver （2.27±0.35） ×10-3 mm2/s. The ADC values of the lesion＇s wall thickness showed there were significantly statistical differences （P 〈 0.01 ） between liver abscess （1.78±0.31）×10-3 mm2/s and cystic and/or necrotic tumor of liver （1.41±0.26）×10-3 mm2/s. Conclusion The DWI and the measurement of ADC value can distinguish between hepatic cyst,liver abscess and cystic and/or necrotic tumor of liver effectively.