(Science: investigation, procedure) A technique in which high-frequency sound waves are bounced off internal organs and the echo pattern is converted into a 2 dimensional picture of the structures beneath the transducer.
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... and subsequent re-screening for galactosemia. The majority of patients were excluded by enzyme assay for hereditary galactosemias and diagnosed by ultrasonography and /or angiogram as having PS shunts in the neonatal period. Galactose is effectively extracted from portal blood by liver and PS shunts ...
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