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Fetal Imaging
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The thermal index, the temperature elevation that potentially can induce fetal injury, is increased in which of the following?
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a. Pulsed Doppler imaging
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b. Longer examination time
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c. Locations near fetal bone
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A 25-year-old with irregular menstrual periods presents with a suspicion of pregnancy. A transvaginal ultrasound is performed with these results. What gestational age should be assigned to the pregnancy?
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What is the standard error for ultrasound estimates of fetal weight after the first trimester?
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What fetal conditions might explain the head measurements seen below?
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c. Fetal neural-tube defect
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Sonographic evaluation of all except which of the following are best achieved in the first trimester?
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A 42-year-old woman presents with vaginal spotting. She has not had a period for 2 months and believes she is perimenopausal. A transvaginal ultrasound is performed in her gynecologist’s office. What is the minimum mean sac diameter measurement necessary to diagnose an anembryonic pregnancy with certainty?
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