title: Is it safe to use diagnostic ultrasound during the first trimester?
authors.forename: F A
authors.initials: FA
authors.lastname: Duck
mesh_terms: D000162:Acoustics; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D013696:Temperature; D014159:Transducers; D018608:Ultrasonography, Doppler; D016216:Ultrasonography, Prenatal