Can a poor boy whose family's annual income is just around 1.5 Lakh rupees dream to become a radiologist?
Yes you can become a radiologist. There are many government colleges in the country that offer medical education (MBBS) and PG is a stipend paying job.
So you just need to study hard in your 11th and 12th and you can get admission in any government college which offers good education for minimal fees like AIIMS.
All the best.