| Sumario: | Medical ultrasonography was first used as a diagnostic tool in 1942 by Theodore Karl Dussik to visualize brain structures. Use of ultrasonography broadened to the field of obstetrics in the 1950s and has since expanded to many other medical special-ties owing to ease of use, reproducibility, low cost, and lack of radiation. Advancements in ultrasonography technology have allowed clinicians to perform procedures with greater accuracy and to characterize tissue better than ever before. Piezoelectric crystals used to produce ultrasound waves have been replaced by silicon chips; artificial intelligence can be used to mitigate user variability; and more portable ultrasound probes are available for use with mobile devices. Ultrasonography requires training to be used appropriately, and patient and family education are crucial when performing an examination. Although some data are available regarding the amount of training needed for users to reach proficiency, this topic remains controversial and no standard currently exists.
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