@raynbow- I have a friend who works as a sonographer in an obstetrician's office. The training that she took to become certified in the field consisted of basic instruction to learn how to operate the equipment and hands-on experience in her chosen specialty.
To become a sonographer, students not only have to perform these procedures, but they also have to understand how to do them on different parts of the body. However, my friend explained that once you know what type of sonographer you want to be, you must take coursework and training geared towards that specialty. She said that this type of comprehensive training allows those entering this growing medical field to have flexibility within their careers when necessary.