| Noun | 1. | ultrasonography - using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organsprenatal diagnosis - any of the diagnostic procedures used to determine whether a fetus has a genetic abnormality tomography, imaging - (medicine) obtaining pictures of the interior of the body A-scan ultrasonography - the use of ultrasonography to measure the length of the eyeball B-scan ultrasonography - the use of ultrasonography to view structure in the back of the eye |