中文摘要：

目的探讨经直肠腔多普勒对前列腺良恶性疾病的诊断意义。方法回顾性分析前列腺癌患者20例和前列腺增生患者20例的临床资料,所有患者均经直肠腔内多普勒进行检测,比较两组的影像学特征。结果前列腺增生患者内腺体积增大。14例前列腺癌患者腺体内显示低回声,占70.0%。对照组前列腺的血供少,分布均匀,前列腺增生血供丰富,血流信号增强,12例为2级及以上,前列腺癌患者血供丰富、血流信号增强,17例为2级及以上,三组差异显著（P〈0.01）。前列腺增生组和前列腺癌组PSV和RI显著高于对照组（P〈0.01）,而前列腺癌组又显著高于前列腺增生组（P〈0.01）。结论前列腺增生和前列腺癌的经直肠超声影像具有不同的特点,掌握这些特点,在临床的鉴别诊断中具有重要的意义。

英文摘要：

Objective To discuss the application value of differential diagnosis of rectum doppler ultrasonography for BPH and Prostate cancer.Methods Retrospective analyzed clinical data of 20 cases with prostate cancer and 20 cas es with BPH.Image data were compared between two groups.Results Prostatic inner gland volume enlarged.14 cases or prostate cancer showed hypoecho,according for 70%.Prostate blood supply of control group was less,and distributed uniformity.Prostate blood supply of BPH was increased.12 cases were more than 2 degree.Prostate blood supply of prostate cancer was increased,and 17 cases were more than 2 degree.There were significant difference in three groups（P〈0.01）.PSV and RI of prostate cancer group and BPH group were higher than control group（P〈0.01）.And prostate cancer group was higher than BPH too（P〈0.01）.Conclusion Image data of rectum doppler ultrasonography shows different characters.To grasp these characters shows important meanings in differential diagnosis.