作者应用彩色多普勒超声测定了７６例乳腺肿瘤（良性３１例，恶性４５例）内血流收缩期峰速（Ｖｐ）和阻力指数（ＲＩ），并对其临床应用价值作了分析。结果表明恶性肿瘤Ｖｐ值明显高于良性肿瘤，良恶性肿瘤ＲＩ值无显著性差异。统计学分析显示良恶性肿瘤之间的临界流速值为１２ｃｍ／ｓｅｃ，该值对直径２ｃｍ以下乳癌诊断敏感性、特异性和准确性分别为９５．５％、１００％和９６．６％。作者认为流速测定有助于乳腺肿瘤，特别是直径２ｃｍ以下肿瘤的鉴别诊断。 The authors used color Doppler ultrasound to measure the systolic peak velocity (Vp) and resistance index (RI) in 76 breast tumors (31 benign and 45 malignant) and analyzed their clinical application value. The results showed that the Vp value of malignant tumors was significantly higher than that of benign tumors. There was no significant difference in RI values ​​between benign and malignant tumors. Statistical analysis showed that the critical flow rate between benign and malignant tumors was 12 cm/sec. The diagnostic sensitivity, specificity, and accuracy for breast cancers below 2 cm in diameter were 95.5%, 100%, and 96.6%, respectively. The authors believe that the flow rate measurement is helpful for the differential diagnosis of breast tumors, especially tumors with a diameter of less than 2 cm.