Pm. Duggan et Lme. Mccowan, REFERENCE RANGES AND ULTRASONOGRAPHIC EXPOSURE CONDITIONS FOR PULSED DOPPLER SONOGRAPHIC STUDIES OF THE FETAL INTERNAL CAROTID-ARTERY, Journal of ultrasound in medicine, 12(12), 1993, pp. 719-722
Citations number
19
Categorie Soggetti
Acoustics,"Radiology,Nuclear Medicine & Medical Imaging
We describe the 5th to 95th percentiles for the resistive index from t
he fetal internal carotid artery and measurements of (1) scanning time
and (2) axial distance between transducer face and the fetal skull du
ring pulsed Doppler examinations. Cerebral resistance peaks at 30 week
s' gestation and declines thereafter. The median duration of pulsed Do
ppler exposure was 31 seconds (range, 4-80 seconds), and the median tr
ansducer-skull distance was 2.2 cm (range, 1.3-6.2 cm). Our data provi
de reference ranges covering the entire period of fetal viability and
help define ultrasonographic exposure conditions during pulsed Doppler
examinations of fetal intracranial vessels.