Os autores apresentam os métodos Doppler e sua evolução no estudo da circulação fetal, dando ênfase à segurança e aos bioefeitos. Os aparelhos de ultra-sonografia utilizados correntemente funcionam com índice térmico máximo e índice mecânico automaticamente mantidos em níveis inferiores a 1,0. Até os dias atuais, não foi descrita lesão biológica em fetos humanos submetidos ao Doppler diagnóstico. Portanto, o Doppler pulsado, o colorido e o power Doppler são seguros na exposição ultra-sonográfica do pré-natal. Unitermos: Dopplervelocimetria; Segurança; Bioefeitos; Pré-natal.Doppler velocimetry in the study of the fetal circulation: review on safety. The authors review the Doppler imaging methods and their evolution for the study of the fetal circulation emphasizing safety and bioeffects. Ultrasound machines work with thermal and mechanical indexes that are automatically kept under 1.0. Up to date, there have been no reports on biological lesions in human fetuses caused by diagnostic Doppler. Consequently, color, pulsed and power Doppler sonography are considered safe in prenatal exposure.
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