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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.


UltrasoundUltrasound image of the liver


Ultrasound image of the liver; dark areas by arrows show possible tumors. Image courtesy of Dr.Thomas Shawker, National Cancer Institute.