Depends where you work and the specialties. Actually when you graduate ultrasound and pass the Registry, you're a TECHNOLOGIST!
You could do vascular, breasts, heart, soft tissue, abdomen, kidney stones and more!
Some Techs travel between offices! There's jobs across America!
I hope this helps! I saw you had another question, but I can't find it!
HEART (Echocardiographer) - per doctor's request, use the Ultrasound machine to check the heart.
VASCULAR (Blood vessels in the body) - per doctor's request, test a particular blood vessel (eg in an arm or leg)
OB/Gyn (Fetus) - in an Ob/Gyn office (mostly), ultrasound the baby of a pregnant patient & give a print to the mom-to-be.
You will pick what specialty you want to get registered in - cardiac (heart), vascular (a lot of programs have gone to dual majors for cardiac/vascular), or RDMS/ general (abdomen and Ob/GYN)
Depending on what you chose, changes the options for settings to work in and whether it's Doctors office/clinic hours or hospital hours with/without call required.
For example, I work for an OB office next to a hospital. We work 4 10 hour shifts but that can be hard to find in clinical/outpatient jobs.
We do our ultrasounds, write reports or get the doctors for abnormalities, clean, stock rooms, etc.
Hope this helps!