They are not technically doctors. They are called sonographers or ultrasound techs.
An ultrasound technician.
No, it's still called an ultrasound or a sonogram.
A person can get ultrasound technology training from any college or university that specializes in ultrasound technology training. Visit a college or university.
I suggest you ask the person who did the ultrasound as I have never heard this.
You really need to talk to your doctor or the person who did the ultrasound about this.
Sonographer
No one is able to hear ultrasound; the frequency of the sound used is far higher than the audible limit of any person or animal. A sonographer will conduct an ultrasound. Ultrasound in the same way that bats navigate - by listening to echos. ultrasound is reflected in propotion to the density of soft tissues. an ultrasound displays the results of these echos.
Ultrasound results generally take a week to get back to the doctor who requested the ultrasound. If ten days go by and there has been no news, you should call them.
Ultrasound technology was first discovered by Paul Langevin and his assistant in 1916. Sonar, a similar technique, was then developed during World War I. The medical applications of ultrasound were later developed in the 1950s and 1960s.
There are some ultrasound courses online. It depends what type of ultrasound instruction you are looking for. There probably will be even more online offerings in the future.
A person who uses sound waves to make images of the body is known as a sonographer or ultrasound technician. They operate ultrasound machines to capture images of internal organs and tissues for diagnostic purposes.
Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. This frequency varies from person to person, it is approximately 20 kilohertz (20,000 hertz). This is the lower limit in describing ultrasound.