Dear,if you want to do it here in Doha,only teaching hospital is Hamad hospital.they take exam for PGRs once in year which is mostly in june/july.And they allow to sit in exam only 2 years post-graduate doctors.If you are fresh graduate then better go for Hamad intren-ship,in this way you will easily get post-graduate training.internship exam is also held in june/july.If you have already done intern-ship then better get an attachment in radiology in Hamad till exam,so that you would be able to know the atmosphere and also it will help you in your interview matching which would be if you pass their written exam.if you need any further detail go to Hamad hospital education department.Good luck!