They are emitted from a transducer which is placed in contact with the maternal abdomen, and is moved to "look at" (likened to a light shined from a torch) any particular content of the uterus.
Repetitive arrays of ultrasound beams scan the fetus in thin slices and are reflected back onto the same transducer.
In normal state, each body tissue type, such as liver, spleen or kidney, has a unique echogenicity.
Fortunately, gestational sac, yolk sac and embryo are surrounded by hyperechoic (brighter) body tissues.
There are two routine scans in pregnancy and the first is called the 12-week scan or “dating” scan – this is because one of the things it looks at is the exact gestation, giving a better idea of your baby's estimated due date.
Western Ultrasound for Women is a specialist Obstetric and Gynecological Imaging practice, with two convenient locations: West Leederville (opposite SJOG Subiaco at 160A Cambridge Street) and Murdoch (within the SJOG Wexford Medical Centre, 3 Barry Marshall Parade, Murdoch).
We specialise in ultrasounds in pregnancy and for gynecological diagnosis.