Hi Prashant!
Some top private colleges in Delhi (and near-by) which offer BSc Radiology are:

• SGT University- Gurgaon
• Delhi Institute of technology and paramedical sciences, Delhi
• Om Paramedical and technical education (OPTE), New Delhi
• Shree Guru Gobind Singh Tricentenary University, Gurgaon
• AIIMS Delhi
• Noida International University, Greater Noida

Thankyou!