title: Endoluminal catheter-assisted transcervical US of the human embryo. Work in progress.
abstract: To enhance visualization of anatomic structures of the human embryo, the authors used a commercially available catheter-based ultrasound (US) transducer (12.5 MHz) introduced through the cervix and into the endometrial cavity of seven women about to undergo voluntary termination of first-trimester pregnancy. The authors term this technique endoluminal catheter-assisted transcervical (ELCAT) sonography. In none of the patients did the US catheter rupture the fluid-filled chorionic/amniotic cavity. The duration of pregnancy ranged from 5.2 to 10.0 menstrual weeks. The most prominent anatomic structures visualized were the heart and neural tube. As an investigational technique, ELCAT US can be used to image anatomic structures of the developing human embryo.
authors.affiliation: Department of Radiological Sciences, UCLA School of Medicine 90024-6969.
authors.forename: N
authors.initials: N
authors.lastname: Ragavendra
authors.forename: J T
authors.initials: JT
authors.lastname: McMahon
authors.forename: R R
authors.initials: RR
authors.lastname: Perrella
authors.forename: F N
authors.initials: FN
authors.lastname: Tessler
authors.forename: G C
authors.initials: GC
authors.lastname: Hansen
authors.forename: C
authors.initials: C
authors.lastname: Kimme-Smith
authors.forename: E G
authors.initials: EG
authors.lastname: Grant
authors.forename: B F
authors.initials: BF
authors.lastname: Crandall
mesh_terms: D002404:Catheterization; D002584:Cervix Uteri; D004622:Embryo, Mammalian / Q000000981:diagnostic imaging; D005260:Female; D005318:Fetal Heart / Q000000981:diagnostic imaging; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D016216:Ultrasonography, Prenatal / Q000379:methods*