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Ultrasound uses sound waves with frequencies above those humans can hear. A transducer sends sound waves traveling into the body which are reflected back from organs and tissues, allowing a picture to be made of the internal organs. Ultrasound can show tumors, and can also guide doctors doing biopsies or treating tumors.
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Ultrasound image of the liver; dark areas by arrows show possible tumors. Image courtesy of Dr.Thomas Shawker, National Cancer Institute.
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