Hey,

Radiologist are the doctors required to treat patients by scanning their internal body images in order to find out the problems going inside the body of that patient.

It's a myth that all doctors wear stethoscope. The radiologist specifically don't wear stethoscope as they don't have anything related to the use of stethoscope. But it's not like that they can't use or don't know how to use.

They can use for some reason but its not a mandating thing for them.

Hope that clears your doubt.

Thank you.