Guidelines to fetal imaging in the first trimester -- Physical principles and bioeffects of first trimester ultrasound -- Technical aspects of the first trimester ultrasound examination -- Fetal biometry and pregnancy dating in the first trimester -- The detailed first trimester ultrasound examination -- First trimester screening for chromosomal aneuploidies -- Multiple pregnancies in the first trimester -- The fetal central nervous system -- The fetal face and neck -- The fetal chest -- The fetal heart and great vessels -- The fetal gastrointestinal system -- The fetal urogenital system -- The fetal skeletal system -- The placenta and umbilical cord.