| Popis: |
During the last three decades, medical ultrasound has grown from a new imaging tool used by only a few clinical pioneers to a diagnostic science now used worldwide in several clinical specialities. In one medical speciality alone, obstetrics, estimates of the percentage of pregnant women in the United States examined by diagnostic ultrasound range from 15–40% (NIH, 1984); in some countries, diagnostic ultrasound is a recommended routine prenatal procedure (NIH, 1984). The rapid development and expansion in the use of diagnostic ultrasound has been largely due to the perceived safety and medical benefits of this technology . |
