I really wanted to make a career in tomography. But had only one elective from another department and didn't know how to make it into this stream.

It’s difficult. Medical devices are not easy for a small business to break into and the big manufacturers don’t typically hire entry-level.

Everyone I know in the field has come into it laterally either from a prior software or hardware job in an unrelated field.

Tomography: Come today, join tomorrow.

You still can! It looks like it is an amazing mix of physics, math, engineering, acoustics, biology, basically everything.