Purpose To research the high frequency ultrasonography diagnosis value on mammary cancer.

目的：探讨高频超声对乳腺癌的诊断价值。

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Objective: Color Doppler ultrasonography (CDU) study internal mammary artery (IMA) dynamic changes for left anterior coronary artery bypass graft operation.

目的：研究冠状动脉搭桥术前后乳内动脉(IMA)血流动力学的改变，为临床提供安全可靠的检查方法。

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