这个词是什么意思？
The visualization of deep structures of the body by recording the reflections or echoes of ultrasonic pulses directed into the tissues. Use of ultrasound for imaging or diagnostic purposes employs frequencies ranging from 1.6 to 10 megahertz.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D014463 · MeSH 2026。
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