The most important health professionals who directly work with your taken images are the radiologists in charged of your department. These doctor will look at your images and work on the diagnostic report for the patients. Hence, it is crucial to demonstrate your expertise in performing sonographic procedures as they directly influence the radiologist's diagnosis. Usually, you will also work with nurses of different departments who are in charged of the patient at the bed-side ultrasound studies. In general ultrasound department within a hospital, you are also require to work closely with nurses and radiologist to perform paracentesis (remove ascites fluid from the abdomen) and thoracentesis (remove fluid from the chest) of the patients, as well as liver, renal, thyroid, etc biopsies, and other procedures that require ultrasound guidance. In OB/GYN setting, sonographers may have to participate in sonohysterographies, which required them to assist the Maternal-Fetal Medicine physicians/ radiologists during the procedure.
Those are my experience after attending multiple clinical rotations in different specialties of sonography. I hope it helps.