Just after having done BSc Radiology, you aren't eligible to teach the courses in colleges. For that you need to acquire atleast a MSc and if possible a PhD in the subject, in order to be a teacher.

Now yeah! if you become a professor in any college, then obviously there will be interdisciplinary course profiles through which you will have to teach subjects like Ultrasonography.

To know more about Radiology visit the link below:

https://www.careers360.com/courses/radiology-course

I hope this answer helps. All the very best for your future endeavors!