![]() ![]() Second trimester ultrasonography may identify 77 to 97% of fetuses with trisomy 18. The use of color Doppler ultrasound to identify fetuses at increased risk for trisomy 21: an alternative for high-risk patients who decline genetic amniocentesis. Color Doppler examination of the outflow tracts of the fetal heart: a technique for identification of cardiovascular malformations. Ductus venosus index: a method for evaluating right ventricular preload in the second-trimester fetus. Simultaneous Doppler recording of the pulmonary artery and vein: a new technique for the evaluation of a fetal arrhythmia. The use of colour Doppler in fetal echocardiography. Doppler color flow mapping: a new technique for the diagnosis of congenital heart disease. Doppler ultrasound in the fetus: a review of current applications. Doppler color flow mapping of the fetal heart. Maulik D, Nanda NC, Hsiung MC, Youngblood JP. ![]() Although the initial application of spatiotemporal imaging technology (STIC) was to simultaneous display three perpendicular planes obtained from a volume acquisition through the fetal chest, the addition of color and power Doppler to the volume acquisition has the following benefits: (1) For first trimester imaging of the fetal heart the rendered cardiovascular system displayed with radiant flow provides a virtual 3-dimensional model of the cardiovascular system and can be used to screen for major malformations that alter ventricular chamber size and alter the orientation of the outflow tracts (2) whether the examiner uses the A, B, and C planes to display the 2-dimensional color/power Doppler images or the transverse ultrasound imaging display, the addition of blood flow enhances the detection of congenital heart defects in both the first and second trimesters of pregnancy and (3) the examiner can view 2-dimensional grayscale cardiac anatomy from a STIC volume, with or without the color/power Doppler display, thus allowing for more precise evaluation of blood flow patterns integrated with cardiac anatomical structures. ![]()
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