<p>Roy A. Filly, M.D.</p>
<p>I have just reached the 30th anniversary of the first obstetrical sonogram I performed. Even having witnessed each of the technological advancements in sonography over those three decades, it is still difficult to comprehend the enormous improvements in image quality that have occurred. These improvements have brought sonography from a “promising” diagnostic tool to a mainstay of modern imaging. However, nowhere in medicine has this technique had a more profound impact than in the field of obstetrics. Thirty years ago there was essentially no such thing as obstetrical imaging and prenatal diagnosis was in its infancy.</p>