Thank you for your question. 

Radiology is a speciality course of medicine.

Firstly you have to complete your MBBS and then appear in NEET PG to get MD in radiology. 

However,  if you are interested to become a radiology technician , then you can do Bsc in radiology.

It's a three year long course. 

There is entrance test for some good colleges and some also take admission on basis of 10+2 marks.

AIIMS

Rajeev Gandhi university of health sciences 

Tata memorial centre are some of the good colleges. 

Good luck