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Examination time for standard fetal anatomic surveys may be significantly shortened by use of 3D volume sonography (4).MR is used with increasing frequency as a supplement to US imaging when the US examination is equivocal or when additional anatomic information is needed for appropriate treatment (5).M-mode US or recording of real-time US by cine loop provide the same documentation at much lower energies.The first trimester covers the period from conception to the end of the 13th menstrual week.

US exposures should be as low as reasonably achievable (ALARA), limiting output control and reducing the amount of time that the beam is focused on one site.Limited examinations are performed generally only when a prior complete examination is on record. Evaluation of fetal and maternal circulation by color flow and spectral Doppler adds significantly to obstetric diagnosis (7).However, because all forms of Doppler involve the use of significantly higher levels of acoustic energy than conventional B-mode imaging, these modalities should be used with caution.The guidelines for the second and the third trimesters define a examination to include fetal presentation, amniotic fluid volume, cardiac activity, placental position, fetal measurements (biometry), fetal number, fetal anatomic survey, maternal cervix, and adnexa.A standard fetal anatomic survey includes the head, face, neck, upper lip, cerebellum, choroid plexus, cisterna magna, lateral cerebral ventricles, midline falx, cavum septum pellucidi, four-chamber heart, outflow tracts, stomach, kidneys, bladder, umbilical cord insertion site, umbilical cord vessel number, the entire spine, and presence or absence of the arms or legs.

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